We’re committed to improving our ecosystems, quality of life, and communities for the better.
Our passion and commitment to the integration of innovative science and engineering drive us to exceed on behalf of every client.
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Here’s a look at our top 10 successes of the year: 1. COMPLETED THE LARGEST STREAM RESTORATION IN MARYLAND We stabilized and restored over 41,000 linear feet of Tinkers Creek, a highly urbanized watershed in Prince George’s County. This is the largest stream restoration project ever completed in Maryland. The project, which we designed for GV-Petro, a partnership between GreenVest and Petro Design Build Group, used bioengineering and nature-based design techniques to prevent erosion and restore wildlife habitat, including the planting of 10,985 native trees and shrubs in the riparian area and 10,910 live stakes along the streambank. 2. EARNED THREE PRESTIGIOUS AWARDS The New Jersey League of Conservation Voters honored us with its inaugural “Sustainability Award,” which recognizes our commitment to a sustainable future in New Jersey, integrating sustainability in everyday life, and making sustainability more accessible to the public. The Miry Run Ponds Master Plan received The New Jersey Chapter of the American Society of Landscape Architects 2021 Chapter Award. We worked with the Mercer County Park Commission and Simone Collins Landscape Architecture to create the Master Plan, which is an ambitious, yet environmentally sensitive design and engineering plan for the restoration of a 279-acre County in Mercer County. The North American Lake Management Society honored Lake Hopatcong Foundation and the Lake Hopatcong Commission with a joint “Lake Management Success Stories Award,” praising the work we led to protect Lake Hopatcong and prevent harmful algal blooms. 3. DESIGNED AND IMPLEMENTED CRITICAL ENVIRONMENTAL RESTORATION PROJECTS We developed a conceptual design for an 165-acre tidal marsh and transitional forest “eco-park” along the South River in Central New Jersey. The design incorporates habitat enhancement and restoration and flood mitigation measures while maximizing public access. The project aims to stabilize approximately 2.5 miles of shoreline, reduce flood risk for smaller coastal storms, and enhance breeding and foraging habitat for 10 state-listed threatened and endangered avian species. We also served as the ecological engineer to Bloomfield Township for an important urban wetland creation project, which transformed a once densely developed, flood-prone, former industrial site into a thriving public active recreation park and 4.2 acres of wetlands. The completed project restored valuable ecological functions and natural floodplain connection, enhanced aquatic and wildlife habitat, and increased flood storage capacity for urban stormwater runoff. 4. REMOVED FIVE DAMS We are proud to have completed five important dam removal projects in three states. In New York, we worked with the Riverkeeper to remove two defunct dams located on tributaries of the Hudson River. The removal of the Strooks Felt Dam and Furnace Brook Barrier #1 will help to restore fish passage between the Hudson and the Atlantic Ocean and revitalize migratory fish populations. In New Jersey, we removed two dams: one in Rockaway Township and one in Mount Laurel Township. And in Pennsylvania, we worked with the Wildlands Conservancy to remove one dams: the Bushkill Creek Dam #4 (also called Crayola Dam). Removing these nonfunctional, outdated dams will bring these rivers back to their natural state and significantly increase biodiversity for the surrounding watersheds. 5. IMPLEMENTED INNOVATIVE INITIATIVES TO MITIGATE AND PREVENT HARMFUL ALGAL BLOOMS [embed]https://www.youtube.com/watch?v=XHswfXKCCTQ&feature=emb_logo[/embed] We installed biochar flotation bags in four waterbodies throughout Hemlock Farms, in the Thompson Park Zoo pond, and in various locations throughout Lake Hopatcong. Biochar improves water quality by removing dissolved phosphorus from fresh waterbodies limiting algal growth and reducing the likelihood of HABs. We created a video outlining the biochar installation process. Working with the Lake Hopatcong Commission and Lake Hopatcong Foundation, we installed three innovative aeration systems in different areas of the lake: one Air Curtain Aeration System, one Nanobubble Aeration System, and one Nanobubble Aeration System with Ozone. We also worked with the NJ Highlands Council to help lake communities prevent HABs and protect water quality by taking a proactive and regional approach to lake management. 6. CELEBRATED A VARIETY OF STAFF ACHIEVEMENTS Our team members are always striving for personal growth, expanding their knowledge, and continue to amaze us. Cory Speroff, PLA, ASLA, CBLP, Landscape Architect, became a Licensed Professional Landscape Architect in New Jersey and Pennsylvania, enabling our firm to now offer professional landscape architect services in those states. Three team members achieved new professional certifications from the Maryland Department of Natural Resources: Environmental Scientist Duncan Simpson PWS, Staff Scientists Ivy Babson and Jesse Smith. Dr. Jack Szczepanski, Senior Project Manager and Aquatic Ecologist, achieved the New Jersey Watershed Institute Green Infrastructure certification, which focuses on sustainable landscape best practices, green infrastructure techniques, and the maintenance of stormwater best management practices. Our Aquatics Director Dr. Fred Lubnow was appointed to the New Jersey HAB Expert Team, which provides guidance to the NJDEP on HAB prevention, treatment, and management. And, four team members achieved their Professional Engineer license: A big congratulations to Ryan Wasik, Rob Costello, Jake Schwartz, and Stephen Duda! 7. COMPLETED STORMWATER MANAGEMENT PROJECTS Over the past year, we’ve designed and completed a variety of stormwater management projects designed to reduce the volume of runoff, decrease phosphorus loading, and improve water quality. We designed and constructed a stormwater treatment train at Thompson Park Zoo, which also included the installation of thousands of native plants. Working with the Deal Lake Commission, we installed twelve floating wetland islands - six in Sunset Lake and six in Wesley Lake; designed and installed three MTDs throughout Asbury Park; and completed a major renovation to an existing rain garden located in front of the Asbury Park bus terminal and municipal building. Our President Geoffrey Goll, P.E. installed a rain garden at his home and documented the entire process with step-by-step instructions so you can build one too! 8. WELCOMED FOUR NEW TEAM MEMBERS We welcomed four new team members with expertise and qualifications in a variety of fields. We hired a new Director of Operations, Megan Hunter Ruf and added Aquatic Specialist Patrick Wilson to the team. And, the Marketing and Communications Department welcomed Proposal Manager Erin Bennett and Communications Intern Andrea Rojas. If you’re interested in joining our team, we’re current hiring for a few full-time positions. Learn more and apply here. 9. LAUNCHED A NEW WEBSITE It was time for a fresh new look! Our new site is easy to navigate, mobile-friendly and includes vivid photos and fun transitions. Browse our multidisciplinary project portfolio. Explore our resources page where you can download presentations and watch webinars. And, visit our blog for project updates, helpful tips, client spotlights, and more. A big shout out and thank you to our web designer FZCreative. 10. PARTICIPATED IN 50+ EVENTS This year, we were proud to have sponsored 20+ events, including the Choose Clean Water Coalition Conference, Living Shoreline Workshop, and SAME MEGA Maryland Conference. We partnered with NJ-AWRA to host a tour of the Award-Winning Linden Blue Acres Green Infrastructure & Floodplain Restoration Project. During the Colorado Lake & Reservoir Management Association Conference, which was held over Halloween weekend, Chris L. Mikolajczyk, CLM, gave a felicitous presentation titled, “In Celebration of All Hallows Eve: Reflections of a Study on One of the Spookiest Lakes in the US.” At the Delaware Estuary’s Science and Environmental Summit, our team members lead four workshops, including one about “Stream, Floodplain & Multi-Functional Riparian Buffer Restoration” presented by Michael Hartshorne, Emily Bjorhus, and Cory Speroff. We hosted a “Facebook Live” conversation during which participants were able to ask experts Dr. Fred Lubnow and Mike Hartshorne all about harmful algal blooms. During the American Fisheries Society Annual Meeting 2021, Geoff Goll presented on “Dam Removal in History, Current State of Removal, and Future Needs.” And, Dana Patterson and Dr. Clay Emerson lead a webinar titled “Stormwater Utility: Is it Right for Your Community & How Might One Work?.” To read about some of the events we have coming up next year, click here! Thank you for supporting Princeton Hydro and sharing our stories. We truly appreciate each and every one of our clients, partners, and friends. Cheers to a successful 2022 and beyond! [post_title] => Year in Review: Top 10 Successes of 2021 [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => top-10-successes-of-2021 [to_ping] => [pinged] => [post_modified] => 2022-01-04 17:40:53 [post_modified_gmt] => 2022-01-04 17:40:53 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?p=9969 [menu_order] => 0 [post_type] => post [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 9813 [post_author] => 1 [post_date] => 2021-12-28 02:38:00 [post_date_gmt] => 2021-12-28 02:38:00 [post_content] => Thousands of native flowering plants and grasses were planted at Thompson Park in Middlesex County, New Jersey. Once established, the native plant meadow will not only look beautiful, it will reduce stormwater runoff and increase habitat for birds, pollinators, and other critical species. The planting was completed by community volunteers along with Eric Gehring of Kramer+Marks Architects, Middlesex County Youth Conservation Corps, Rutgers Cooperative Extension of Middlesex County, South Jersey Resource Conservation and Development Council, and Princeton Hydro Landscape Architect Cory Speroff, PLA, ASLA, CBLP. All of the plants that were installed are native to the north-central region of New Jersey. Volunteers planted switchgrass (panicum virgatum), orange coneflower (rudbeckia fulgida), blue wild indigo (baptisia australis), partridge pea (chamaecrista fasciculata), Virginia mountain mint (pycnanhemum virginianum), and aromatic aster (symphyotrichum oblongifolium). In selecting the location for each of the plants, special consideration was given to each species' drought tolerance and sunlight and shade requirements. The selected plant species all provide important wildlife value, including providing food and shelter for migratory birds. Photos provided by: Michele Bakacs The planting initiative is one part of a multi-faceted Stormwater Treatment Train project recently completed in Thompson Park. The project is funded by a Water Quality Restoration 319(h) grant awarded to South Jersey Resource Conservation and Development Council by the NJDEP. Middlesex County Office of Parks and Recreation and Office of Planning, NJDEP, South Jersey Resource Conservation and Development Council, Middlesex County Mosquito Extermination Commission, Freehold Soil Conservation District, Rutgers Cooperative Extension, Enviroscapes, and Princeton Hydro worked together to bring this project to fruition. To learn more about the Thompson Park Zoo stormwater project, check out our recent blog: Stormwater Management at Thompson Park ZooWhat is Stormwater Runoff? Stormwater runoff is all of the rainfall or snowmelt water that is not absorbed into the ground and instead flows over land. When not managed properly, stormwater runoff causes issues like pollution in our waterways, flooding, and erosion. Stormwater runoff has been cited in multiple studies as a leading cause of... [post_title] => Thousands of Native Plants Installed in Thompson Park [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => thompson-park-native-plant-meadow [to_ping] => [pinged] => [post_modified] => 2021-12-27 12:58:34 [post_modified_gmt] => 2021-12-27 12:58:34 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?p=9813 [menu_order] => 0 [post_type] => post [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 9403 [post_author] => 1 [post_date] => 2021-12-27 12:55:10 [post_date_gmt] => 2021-12-27 12:55:10 [post_content] => What is Stormwater Runoff? Stormwater runoff is all of the rainfall or snowmelt water that is not absorbed into the ground and instead flows over land. When not managed properly, stormwater runoff causes issues like pollution in our waterways, flooding, and erosion. Stormwater runoff has been cited in multiple studies as a leading cause of water quality impairment to our local lakes and rivers. And, with increasing levels of rainfall from climate change impacts, stormwater management is an especially critical issue for communities all across the U.S. What is Stormwater Management? Stormwater management focuses on reducing runoff and improving water quality through a variety of techniques. Traditional stormwater management methods include things like storm drains, retention ponds, and culverts. Green stormwater infrastructure uses vegetation, soil, and other natural components to manage stormwater. Green stormwater infrastructure systems mimic natural hydrology to take advantage of interception, evapotranspiration, and infiltration of stormwater runoff at its source. Examples include rain gardens, constructed wetlands, vegetated bioswales, and living shorelines. Many stormwater systems include a combination of grey and green infrastructure management practices. Stormwater management treatment "trains" combine multiple stormwater management processes in order to prevent pollution and decrease stormwater flow volumes that negatively affect the receiving waterbody. Let’s Take a Look at a Stormwater Treatment Train in Action The Thompson Park Zoo in New Jersey Thompson Park is a 675-acre recreation area - the largest developed park in the Middlesex County park system - with numerous attractions including playgrounds, ballfields, hiking trails, and a zoo. The zoo is an animal haven that houses over 50 geese and fowl, goats, and approximately 90 deer in a fenced enclosure. The park also features Lake Manalapan. Within the zoo is a 0.25-acre pond that impounds stormwater runoff from adjacent uplands and two stormwater-fed tributaries to Lake Manalapan and Manalapan Brook. There are three tributaries to the pond with varying levels of erosion. The western tributary contains a headcut that is approximately four feet high. A headcut is created by a sudden down-cutting of the stream bottom. Similar to a miniature waterfall, a headcut slowly migrates upstream and becomes deeper as it progresses. The headcut in the Zoo tributary had destabilized the stream by eroding and incising its channel and banks. Additionally, foraging by Zoo inhabitants had removed most ground cover around the pond and associated tributaries, which also caused erosion. The bare soil conditions, headcut, and manure from the Zoo animals were contributing sediment, nutrient, and pathogen loading to the Zoo pond and subsequently Lake Manalapan. The Zoo pond drains to an outlet structure, a 24-inch reinforced concrete pipe (RCP), and subsequently to a vegetated swale via a stormwater outlet. A second outlet pipe drains stormwater runoff from an asphalt parking lot which discharges to the vegetated swale. The shoreline of Lake Manalapan where the vegetated swale drains into the lake was the subject of a previous restoration project during which a diverse suite of native plants was installed; however, the swale was not included in this project and a maintained lawn, which does not adequately filter stormwater runoff or provide any ecosystem services. The swale also had little access to its floodplain where vegetation can help filter non-point source (NPS) pollutants from the Zoo pond and adjacent uplands. Images taken in September 2021, before the restoration work commenced, show areas of erosion and a riparian zone devoid of vegetation. Implementing a Stormwater Management Treatment Train In order to increase channel stability, decrease erosion, improve water quality and ecological function, and reduce the NPS pollutants originating from the Zoo, a stormwater management treatment train was designed and constructed. Middlesex County Office of Parks and Recreation and Office of Planning, the New Jersey Department of Environmental Protection (NJDEP), South Jersey Resource Conservation and Development Council (SJRC&D), Middlesex County Mosquito Extermination Commission, Freehold Soil Conservation District, Rutgers Cooperative Extension, Enviroscapes and Princeton Hydro worked together to fund, design, permit, and construct the following stormwater management measures:
We stabilized and restored over 41,000 linear feet of Tinkers Creek, a highly urbanized watershed in Prince George’s County. This is the largest stream restoration project ever completed in Maryland. The project, which we designed for GV-Petro, a partnership between GreenVest and Petro Design Build Group, used bioengineering and nature-based design techniques to prevent erosion and restore wildlife habitat, including the planting of 10,985 native trees and shrubs in the riparian area and 10,910 live stakes along the streambank.
The New Jersey League of Conservation Voters honored us with its inaugural “Sustainability Award,” which recognizes our commitment to a sustainable future in New Jersey, integrating sustainability in everyday life, and making sustainability more accessible to the public. The Miry Run Ponds Master Plan received The New Jersey Chapter of the American Society of Landscape Architects 2021 Chapter Award. We worked with the Mercer County Park Commission and Simone Collins Landscape Architecture to create the Master Plan, which is an ambitious, yet environmentally sensitive design and engineering plan for the restoration of a 279-acre County in Mercer County. The North American Lake Management Society honored Lake Hopatcong Foundation and the Lake Hopatcong Commission with a joint “Lake Management Success Stories Award,” praising the work we led to protect Lake Hopatcong and prevent harmful algal blooms.
We developed a conceptual design for an 165-acre tidal marsh and transitional forest “eco-park” along the South River in Central New Jersey. The design incorporates habitat enhancement and restoration and flood mitigation measures while maximizing public access. The project aims to stabilize approximately 2.5 miles of shoreline, reduce flood risk for smaller coastal storms, and enhance breeding and foraging habitat for 10 state-listed threatened and endangered avian species. We also served as the ecological engineer to Bloomfield Township for an important urban wetland creation project, which transformed a once densely developed, flood-prone, former industrial site into a thriving public active recreation park and 4.2 acres of wetlands. The completed project restored valuable ecological functions and natural floodplain connection, enhanced aquatic and wildlife habitat, and increased flood storage capacity for urban stormwater runoff.
We are proud to have completed five important dam removal projects in three states. In New York, we worked with the Riverkeeper to remove two defunct dams located on tributaries of the Hudson River. The removal of the Strooks Felt Dam and Furnace Brook Barrier #1 will help to restore fish passage between the Hudson and the Atlantic Ocean and revitalize migratory fish populations. In New Jersey, we removed two dams: one in Rockaway Township and one in Mount Laurel Township. And in Pennsylvania, we worked with the Wildlands Conservancy to remove one dams: the Bushkill Creek Dam #4 (also called Crayola Dam). Removing these nonfunctional, outdated dams will bring these rivers back to their natural state and significantly increase biodiversity for the surrounding watersheds.
We installed biochar flotation bags in four waterbodies throughout Hemlock Farms, in the Thompson Park Zoo pond, and in various locations throughout Lake Hopatcong. Biochar improves water quality by removing dissolved phosphorus from fresh waterbodies limiting algal growth and reducing the likelihood of HABs. We created a video outlining the biochar installation process. Working with the Lake Hopatcong Commission and Lake Hopatcong Foundation, we installed three innovative aeration systems in different areas of the lake: one Air Curtain Aeration System, one Nanobubble Aeration System, and one Nanobubble Aeration System with Ozone. We also worked with the NJ Highlands Council to help lake communities prevent HABs and protect water quality by taking a proactive and regional approach to lake management.
Our team members are always striving for personal growth, expanding their knowledge, and continue to amaze us. Cory Speroff, PLA, ASLA, CBLP, Landscape Architect, became a Licensed Professional Landscape Architect in New Jersey and Pennsylvania, enabling our firm to now offer professional landscape architect services in those states. Three team members achieved new professional certifications from the Maryland Department of Natural Resources: Environmental Scientist Duncan Simpson PWS, Staff Scientists Ivy Babson and Jesse Smith. Dr. Jack Szczepanski, Senior Project Manager and Aquatic Ecologist, achieved the New Jersey Watershed Institute Green Infrastructure certification, which focuses on sustainable landscape best practices, green infrastructure techniques, and the maintenance of stormwater best management practices. Our Aquatics Director Dr. Fred Lubnow was appointed to the New Jersey HAB Expert Team, which provides guidance to the NJDEP on HAB prevention, treatment, and management. And, four team members achieved their Professional Engineer license: A big congratulations to Ryan Wasik, Rob Costello, Jake Schwartz, and Stephen Duda!
Over the past year, we’ve designed and completed a variety of stormwater management projects designed to reduce the volume of runoff, decrease phosphorus loading, and improve water quality. We designed and constructed a stormwater treatment train at Thompson Park Zoo, which also included the installation of thousands of native plants. Working with the Deal Lake Commission, we installed twelve floating wetland islands - six in Sunset Lake and six in Wesley Lake; designed and installed three MTDs throughout Asbury Park; and completed a major renovation to an existing rain garden located in front of the Asbury Park bus terminal and municipal building. Our President Geoffrey Goll, P.E. installed a rain garden at his home and documented the entire process with step-by-step instructions so you can build one too!
We welcomed four new team members with expertise and qualifications in a variety of fields. We hired a new Director of Operations, Megan Hunter Ruf and added Aquatic Specialist Patrick Wilson to the team. And, the Marketing and Communications Department welcomed Proposal Manager Erin Bennett and Communications Intern Andrea Rojas. If you’re interested in joining our team, we’re current hiring for a few full-time positions. Learn more and apply here.
It was time for a fresh new look! Our new site is easy to navigate, mobile-friendly and includes vivid photos and fun transitions. Browse our multidisciplinary project portfolio. Explore our resources page where you can download presentations and watch webinars. And, visit our blog for project updates, helpful tips, client spotlights, and more. A big shout out and thank you to our web designer FZCreative.
This year, we were proud to have sponsored 20+ events, including the Choose Clean Water Coalition Conference, Living Shoreline Workshop, and SAME MEGA Maryland Conference. We partnered with NJ-AWRA to host a tour of the Award-Winning Linden Blue Acres Green Infrastructure & Floodplain Restoration Project. During the Colorado Lake & Reservoir Management Association Conference, which was held over Halloween weekend, Chris L. Mikolajczyk, CLM, gave a felicitous presentation titled, “In Celebration of All Hallows Eve: Reflections of a Study on One of the Spookiest Lakes in the US.” At the Delaware Estuary’s Science and Environmental Summit, our team members lead four workshops, including one about “Stream, Floodplain & Multi-Functional Riparian Buffer Restoration” presented by Michael Hartshorne, Emily Bjorhus, and Cory Speroff. We hosted a “Facebook Live” conversation during which participants were able to ask experts Dr. Fred Lubnow and Mike Hartshorne all about harmful algal blooms. During the American Fisheries Society Annual Meeting 2021, Geoff Goll presented on “Dam Removal in History, Current State of Removal, and Future Needs.” And, Dana Patterson and Dr. Clay Emerson lead a webinar titled “Stormwater Utility: Is it Right for Your Community & How Might One Work?.” To read about some of the events we have coming up next year, click here!
Thank you for supporting Princeton Hydro and sharing our stories. We truly appreciate each and every one of our clients, partners, and friends. Cheers to a successful 2022 and beyond!
Thousands of native flowering plants and grasses were planted at Thompson Park in Middlesex County, New Jersey. Once established, the native plant meadow will not only look beautiful, it will reduce stormwater runoff and increase habitat for birds, pollinators, and other critical species.
The planting was completed by community volunteers along with Eric Gehring of Kramer+Marks Architects, Middlesex County Youth Conservation Corps, Rutgers Cooperative Extension of Middlesex County, South Jersey Resource Conservation and Development Council, and Princeton Hydro Landscape Architect Cory Speroff, PLA, ASLA, CBLP.
All of the plants that were installed are native to the north-central region of New Jersey. Volunteers planted switchgrass (panicum virgatum), orange coneflower (rudbeckia fulgida), blue wild indigo (baptisia australis), partridge pea (chamaecrista fasciculata), Virginia mountain mint (pycnanhemum virginianum), and aromatic aster (symphyotrichum oblongifolium). In selecting the location for each of the plants, special consideration was given to each species' drought tolerance and sunlight and shade requirements. The selected plant species all provide important wildlife value, including providing food and shelter for migratory birds.
The planting initiative is one part of a multi-faceted Stormwater Treatment Train project recently completed in Thompson Park. The project is funded by a Water Quality Restoration 319(h) grant awarded to South Jersey Resource Conservation and Development Council by the NJDEP.
Middlesex County Office of Parks and Recreation and Office of Planning, NJDEP, South Jersey Resource Conservation and Development Council, Middlesex County Mosquito Extermination Commission, Freehold Soil Conservation District, Rutgers Cooperative Extension, Enviroscapes, and Princeton Hydro worked together to bring this project to fruition.
To learn more about the Thompson Park Zoo stormwater project, check out our recent blog:
Stormwater runoff is all of the rainfall or snowmelt water that is not absorbed into the ground and instead flows over land. When not managed properly, stormwater runoff causes issues like pollution in our waterways, flooding, and erosion. Stormwater runoff has been cited in multiple studies as a leading cause of water quality impairment to our local lakes and rivers. And, with increasing levels of rainfall from climate change impacts, stormwater management is an especially critical issue for communities all across the U.S.
Stormwater management focuses on reducing runoff and improving water quality through a variety of techniques.
Traditional stormwater management methods include things like storm drains, retention ponds, and culverts. Green stormwater infrastructure uses vegetation, soil, and other natural components to manage stormwater. Green stormwater infrastructure systems mimic natural hydrology to take advantage of interception, evapotranspiration, and infiltration of stormwater runoff at its source. Examples include rain gardens, constructed wetlands, vegetated bioswales, and living shorelines. Many stormwater systems include a combination of grey and green infrastructure management practices.
Stormwater management treatment "trains" combine multiple stormwater management processes in order to prevent pollution and decrease stormwater flow volumes that negatively affect the receiving waterbody.
Thompson Park is a 675-acre recreation area - the largest developed park in the Middlesex County park system - with numerous attractions including playgrounds, ballfields, hiking trails, and a zoo. The zoo is an animal haven that houses over 50 geese and fowl, goats, and approximately 90 deer in a fenced enclosure. The park also features Lake Manalapan.
Within the zoo is a 0.25-acre pond that impounds stormwater runoff from adjacent uplands and two stormwater-fed tributaries to Lake Manalapan and Manalapan Brook. There are three tributaries to the pond with varying levels of erosion. The western tributary contains a headcut that is approximately four feet high. A headcut is created by a sudden down-cutting of the stream bottom. Similar to a miniature waterfall, a headcut slowly migrates upstream and becomes deeper as it progresses. The headcut in the Zoo tributary had destabilized the stream by eroding and incising its channel and banks. Additionally, foraging by Zoo inhabitants had removed most ground cover around the pond and associated tributaries, which also caused erosion.
The bare soil conditions, headcut, and manure from the Zoo animals were contributing sediment, nutrient, and pathogen loading to the Zoo pond and subsequently Lake Manalapan. The Zoo pond drains to an outlet structure, a 24-inch reinforced concrete pipe (RCP), and subsequently to a vegetated swale via a stormwater outlet. A second outlet pipe drains stormwater runoff from an asphalt parking lot which discharges to the vegetated swale.
The shoreline of Lake Manalapan where the vegetated swale drains into the lake was the subject of a previous restoration project during which a diverse suite of native plants was installed; however, the swale was not included in this project and a maintained lawn, which does not adequately filter stormwater runoff or provide any ecosystem services. The swale also had little access to its floodplain where vegetation can help filter non-point source (NPS) pollutants from the Zoo pond and adjacent uplands.
In order to increase channel stability, decrease erosion, improve water quality and ecological function, and reduce the NPS pollutants originating from the Zoo, a stormwater management treatment train was designed and constructed.
Middlesex County Office of Parks and Recreation and Office of Planning, the New Jersey Department of Environmental Protection (NJDEP), South Jersey Resource Conservation and Development Council (SJRC&D), Middlesex County Mosquito Extermination Commission, Freehold Soil Conservation District, Rutgers Cooperative Extension, Enviroscapes and Princeton Hydro worked together to fund, design, permit, and construct the following stormwater management measures:
To see the project elements taking shape and being completed, watch our video:
The project is funded by a Water Quality Restoration 319(h) grant awarded to SJRC&D by the NJDEP for continued implementation of watershed-based measures to reduce NPS pollutant loading and compliance with a total phosphorus (TP) Total Maximum Daily Load (TMDL) established by the NJDEP for Lake Manalapan. The TMDL is a regulatory term in the U.S. Clean Water Act, that identifies the maximum amount of a pollutant (in this case phosphorus) that a waterbody can receive while still meeting water quality standards.
“The South Jersey Resource Conservation and Development Council was pleased to participate in this project. Partnering with these various governmental agencies and private entities to implement on the ground conservation and water quality improvements aligns perfectly with our mission. We are thrilled with the great work done at Thompson Park and look forward to continuing this partnership.”Craig McGee, South Jersey Resource Conservation and Development Council District Manager
“The South Jersey Resource Conservation and Development Council was pleased to participate in this project. Partnering with these various governmental agencies and private entities to implement on the ground conservation and water quality improvements aligns perfectly with our mission. We are thrilled with the great work done at Thompson Park and look forward to continuing this partnership.”
Construction of the stormwater treatment train components began in early August 2021 and was completed by the end of September 2021.
The first step of the stormwater treatment train was to stabilize the tributary to Lake Manalapan and its associated headcut. Streambank stabilization measures included grade modifications to create a gradual stream slope and dynamically stable form with improved habitat features, including riffles and pools, with gravel and cobble substrate. On August 17, grading of the floodplain bench began, the RCP was exposed, and the team started excavation for the lower three steps in the step-pool sequence.
On August 20, the rock grade and step-pool sequence were completed. And, fabric was installed along both sides of the rock-lined channel to increase stream-bank stability. Rock was placed within the pools to cover the edge of the fabric. We are very pleased to report that the newly restored channel held up to two large storm events during the construction process.
Bags of BioChar, a pure carbon charcoal-like substance made from organic material, were installed across the Zoo pond using an anchor and line system. The BioChar bags help to remove TP and other nutrients from the water column and bed sediments of the Zoo pond and subsequently Manalapan Brook Watershed. The team also built, planted and installed a floating wetland island, an effective green infrastructure solution that improves water quality by assimilating and removing excess nutrients that could fuel algae growth.
After conclusion of pipe lighting, excavation of the floodplain bench and installation of scour protection, native perennial vegetation was planted within the floodplain and swale in order to provide sediment deposition and nutrient uptake functions, as well as aquatic food web services and water temperature moderation before flows are discharged to Lake Manalapan. The plantings also enhance and create suitable avian and pollinator species habitat, and greater flora and fauna diversity.
This stormwater treatment train project improves the habitat and water quality of the Manalapan Brook Watershed by addressing NPS pollutants that originate from Thompson Park Zoo. The completed work also supports the Watershed Protection and Restoration Plan for the Manalapan Brook Watershed by reducing TSS and TP loads in compliance with the TMDL. Additionally, the project improves the overall ecosystem by stabilizing eroded streambanks, installing native and biodiverse vegetation, and reducing the quantity of pollutants entering Lake Manalapan.
“Thompson Park Zoo is an excellent model for showcasing a successful and comprehensive approach to stormwater management and watershed restoration through a dynamic multi-stakeholder partnership. We are so proud to be a part of this project and continue to support the Manalapan Brook Watershed Protection Plan through a variety of restoration activities.”Amy McNamara, E.I.T, Princeton Hydro Project Manager and Water Resource Engineer
“Thompson Park Zoo is an excellent model for showcasing a successful and comprehensive approach to stormwater management and watershed restoration through a dynamic multi-stakeholder partnership. We are so proud to be a part of this project and continue to support the Manalapan Brook Watershed Protection Plan through a variety of restoration activities.”
At Princeton Hydro, we are experts in stormwater management; we recognize the numerous benefits of green infrastructure; and we’ve been incorporating green infrastructure into our engineering designs since before the term was regularly used in the stormwater lexicon. Click here to learn more about our stormwater management services.
Earlier this year, we announced that we're relocating our Ringoes headquarters to Trenton's Historic Roebling Wireworks Carpentry Shop. Today, we're excited to share that construction has commenced, and move-in is expected to take place in March 2022.
Trenton's historic Roebling Carpentry Shop is transforming into a unique, state-of-the-art office space, and our move will help to bring life back to a building that has been vacant for more than 25 years! With so much character and opportunity, our new space will enable us to increase our regional reach and partner with more clients who share our values.
“After looking at many properties, we fell in love with this space. It is the perfect mix of character, history, and location, and it fulfills our desire to be a part of the revitalization of the City of Trenton. We’re excited to meet our new neighbors and look forward to getting involved with the local community,” said Princeton Hydro President Geoff Goll, P.E.
Check out some pictures from the construction process and stay tuned for more updates in the New Year!
The Princeton Hydro team is proud to be participating in and sponsoring a variety events focused on conserving, restoring, and protecting our precious water resources. In this edition of our Events Spotlight, we provide a snapshot of upcoming events this Winter and information on how to get involved:
The NEAPMS, a diverse group of professionals dedicated to understanding the unique needs of aquatic plant management in the Northeast, is hosting its 23rd Annual Meeting. This year's conference, which is being held online, includes three days of educational workshops, technical sessions, and poster presentations focused on active management of aquatic plants and algae. Get more info and register.
As part of its Watershed Wednesdays webinar series, the Watershed Institute is hosting a Streambank Restoration webinar on January 19 from 6 - 7:15pm. The webinar is being led by three Princeton Hydro team members: Jake Dittes, P.E. will provide an overview of streams, how they flow, and the connection between land and water. Casey Schrading, EIT will speak about restoration projects and native plants. And, Cory Speroff, RLA, ASLA, CBLP will discuss he longest stream restoration project ever completed in Maryland. The webinar, which is free and being held virtually on Zoom, will also include a Q&A session. Get more info and register.
The 10th annual Delaware Wetlands Conference, held during World Wetlands Day, will feature two full days of presentations and discussions on a range of subjects related to the health and management of wetlands in Delaware and the region. Princeton Hydro team members are giving two presentations: Senior Ecologist Michael Rehman, CERP, PWS is presenting on "Revisiting Successful Wetland Mitigation Projects—Is Five Years of Monitoring Sufficient?" and Vice President Mark Gallagher is presenting on "Lessons Learned: Restoring the Northernmost Freshwater Tidal Marsh on the Delaware River." Get more info and register.
We are looking forward to attending the Bowman’s Hill Wildflower Preserve 22nd Annual Land Ethics Symposium. We have been a long-time sponsor of this special event and are proud to once again extend our support to this year's symposium. The symposium is themed "Creative Approaches for Ecological Landscaping" and includes a presentation from The Nature Conservancy in New Jersey's Director of River Restoration Beth Styler Barry. Beth is presenting on the removal of the Columbia Dam - the largest dam removal in New Jersey history. Less than two weeks after the dam was completely removed, American shad, which had not been seen in the area in 100 years, were recorded ten miles upstream! Get more info and register.
The National Dam Safety Program is hosting its 29th Annual National Dam Safety Program Technical Seminar, titled “Managing Aging Dam and Levee Infrastructure.” The two-day seminar includes a variety of presentations on topics ranging from dam incident management to levee safety incidents to infrastructure legislation. Princeton Hydro President Geoff Goll, P.E. is presenting on “Dam Removal and the Infrastructure Investment and Jobs Act (IIJA): an Opportunity to Remove Flood Hazards and Restore Resiliency.” Get more info and register.
PALMS is hosting its 32nd annual conference at the Wyndham Garden State College in Boalsburg, PA. This year’s conference, titled “A New Era of Lake Appreciation and Management,” includes a collection of professional presentations, workshops and panel discussions. Princeton Hydro is leading two of the workshops: Director of Aquatic Resources, Dr. Fred Lubnow, is presenting on the “Using phycocyanin meters to monitor Harmful Algal Blooms (HABs) and the development of HAB Management Plans.” And, Senior Aquatic Ecologist Michael Hartshorne is presenting on the "Development of an Adaptive Lake Management Plan for Lake Latonka." Get more info and register.
Hosted by the Villanova Center for Resilient Water Systems, home of the Villanova Urban Stormwater Partnership (VUSP), this year’s Stormwater Symposium is intended “to advance the knowledge and understanding of sustainable stormwater management for those dealing in all aspects of planning, design, implementation and regulatory compliance,” a mission that has remained unchanged since the event was first held in 1998. This event is free for members of VUSP. Get more info and register.
Over the past year, the Deal Lake Commission (DLC) has implemented a variety of stormwater management projects aimed at reducing the volume of stormwater runoff, decreasing total phosphorus loading, and preventing debris, sediment, and pollutants from flowing into waterbodies throughout the Deal Lake, Wesley Lake, and Sunset Lake Watersheds.
These projects encompass a strategic combination of stormwater best management practices (BMPs), including structural BMPs, non-structural controls, and green infrastructure techniques. These stormwater management projects were funded by a Clean Water Act Section 319(h) grant awarded by the New Jersey Department of Environmental Protection to the DLC.
Let’s take a look at some of the recently completed initiatives:
Manufactured Treatment Devices (MTDs) are pre-fabricated stormwater treatment structures used to address stormwater issues in highly developed, urban areas. MTDs capture and remove sediments, metals, hydrocarbons, and other pollutants from stormwater runoff before the runoff reaches surrounding waterbodies and/or storm sewer systems.
This year, Princeton Hydro worked with the DLC and Leon S. Avakian Engineers to design and install three MTDs throughout Asbury Park, NJ with the purpose of improving water quality in Sunset Lake.
Students from the Asbury Park High School Engineering Academy, led by their teacher Kevin Gould, were invited to observe one of the MTD installations. The educational field trip was combined with a presentation from Princeton Hydro’s Senior Aquatic Ecologist Dr. Jack Szczepanski, which was titled, “Ecology and Engineering in Asbury Park.”
Rain gardens are a cost effective, attractive, and sustainable way to minimize stormwater runoff and filter out pollutants. This aesthetic, low-maintenance addition to any outdoor landscape creates a functioning habitat that attracts pollinators, beneficial insects, and birds. And, in a small way, it helps reduce erosion, promote groundwater recharge, and minimize flooding.
The DLC along with the Deal Lake Watershed Alliance, Asbury Park's Environmental Shade Tree Commission (ESTC), Asbury Park Department of Public Works (DPW) and Princeton Hydro completed a major renovation to an existing rain garden located in front of the Asbury Park bus terminal and municipal building.
The rain garden, which was originally constructed by the ESTC, was not functioning properly due to one of the inlets being completely obstructed by sediment. The DPW helped clear the sediment and regrade it, while the ESTC removed invasive weeds and replanted it with native shrubs, perennials, and flowers.
Floating Wetland Islands (FWIs) are a low-cost, effective green infrastructure solution used to mitigate phosphorus and nitrogen stormwater pollution. FWIs are designed to mimic natural wetlands in a sustainable, efficient, and powerful way. They improve water quality by assimilating and removing excess nutrients that could fuel harmful algae blooms; provide valuable ecological habitat for a variety of beneficial species; help mitigate wave and wind erosion impacts; provide an aesthetic element; and add significant biodiversity enhancement within open freshwater environments.
The DLC worked with Princeton Hydro to design and install a total of 12 floating wetland islands, six in Sunset Lake and six in Wesley Lake. A team of volunteers, led by the DLC and Princeton Hydro, planted vegetation in each of the FWIs and launched and secured each island into the lakes.
Clean Water Act Section 319(h) grant related efforts will continue in the Spring of 2022 with the design and installation of “bioscape” gardens and tree boxes. Stay tuned for updates!
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To learn more about the Deal Lake Commission, click here. To read about one of Princeton Hydro’s recently completed stormwater management projects, click here.
The Musconetcong River begins at New Jersey’s largest lake, Lake Hopatcong, and flows southwest for 42 miles before emptying into the Delaware River. At the headwaters in Lake Hopatcong, the community has been battling with harmful algal blooms (HABs). HABs can cause significant water quality issues in lakes and ponds, often forming a visible and sometimes odorous scum on the surface of the water. Blooms are primarily caused by warmer temperatures and increased amounts of nutrients (i.e., nitrogen and phosphorus) from stormwater runoff.
In 2019, the local community suffered immensely from HABs, which was the most prolific bloom the lake has experienced over the last two decades, resulting in public health advisories to be issued for recreation on the lake. Because Lake Hopatcong is a popular summer vacation destination, this outbreak unfortunately stunted the local economy, restricted recreational usage of the lake, and impacted fish and wildlife.
The Lake Hopatcong Commission and Lake Hopatcong Foundation, in partnership with municipalities, counties, the state, local groups like the Musconetcong Watershed Association, and Princeton Hydro, have been working to improve water quality for years by prioritizing stormwater mitigation and septic management policies within the watershed. So why was the summer of 2019 so intense?
Princeton Hydro scientists have been collecting water quality data in Lake Hopatcong for 30 years. This includes dissolved oxygen, pH, and temperature, as well as concentrations of total suspended solids, total phosphorus, nitrate‐N, ammonia‐N and chlorophyll a, and various biological factors. There are not many lakes in New Jersey that have such a robust and consistent public dataset, which presents a rare opportunity to study long-term trends. We dove a little deeper into this information to see what many have caused the 2019 blooms.
We analyzed a statistically significant dataset of surface water temperatures and found that average July surface temperatures in Lake Hopatcong have been steadily increasing over time. We also have 20+ years of observational data that documents an increase in frequency, duration, and magnitude of HABs over the same time period. In fact, HABs have recently persisted all the way into the winter months, enabling “green ice” to form on the lake surface, as observed in December 2020.
In summer of 2019, the Lake Hopatcong region was hit with a dramatic amount of rainfall. These weather patterns resulted in some of the highest early summer total phosphorus (TP) concentrations in Lake Hopatcong in over 20 years. The mean June TP concentration was 0.043 mg/L; the last time it exceeded 0.04 mg/L was in 1999. In order to have acceptable water quality conditions in the lake, the mean TP concentrations should be at 0.03 mg/L or lower.
It has been well documented that phosphorus is the primary limiting nutrient in Lake Hopatcong. Meaning, a slight increase in phosphorus can result in a substantial increase in algal and/or aquatic plant biomass. The water quality analysis identified the cause for the HABs (the high frequency of storms in June 2019 transporting nutrients, in particular phosphorus, to the lake) and identified why they persisted over the growing season (internal phosphorus loading).
Climate change is leading to more frequent, more intense rainstorms that transport run-off pollutants into waterways, coupled with hotter days to warm the water. The latest Intergovernmental Panel on Climate Change (IPCC) report, “AR6 Climate Change 2021: The Physical Science Basis,” confirmed that human influence has warmed the atmosphere, ocean, and land, and that this human-induced climate change is already affecting many weather and climate extremes in every region across the globe. It predicts, “increases in the frequency and intensity of hot extremes, marine heatwaves, and heavy precipitation, agricultural and ecological droughts in some regions, and proportion of intense tropical cyclones, as well as reductions in Arctic sea ice, snow cover and permafrost.” In the Mid-Atlantic region of the U.S., most climate models indicate that the landscape will become warmer and wetter.
Looking at our observations and 30-year dataset for Lake Hopatcong, our preliminary analysis shows that climate change — increased precipitation (which flushed the phosphorus into the lake) followed by intense heat to warm surface water temperatures — was a significant variable that led to the devastating HABs at Lake Hopatcong in 2019.
Other communities have experienced similar trends too. According to the U.S. Environmental Protection Agency, HABs have now been observed in all 50 states, ranging from large freshwater lakes, to smaller inland lakes, rivers, and reservoirs. Our neighbors in Upstate New York suffered from 1,000+ HAB occurrences during the 2019 season, including a HAB that covered 600+ square miles of Lake Erie causing beach closures and fish kills.
A study recently published in Nature journal reviewed three decades of high-resolution satellite data for 71 large lakes globally and determined that “peak summertime bloom intensity has increased in most (68%) of the lakes studied, revealing a global exacerbation of bloom conditions.” The study called for water quality management efforts to better account for the interactions between climate change and local hydrological conditions.
We are witnessing these impacts firsthand at Lake Hopatcong and within the Musconetcong River Watershed. And, according to the IPCC report, these climate change-induced instances (i.e. intense rainfall followed by intense heat) may become even more frequent. To further understand the connection between climate change and HABs at Lake Hopatcong, Princeton Hydro is conducting a more rigorous study that includes more distinct data. We hope this will provide some insight on how to manage expected climate impacts in lakes and watersheds.
While the IPCC report conclusions may be depressing, there is still much we can do at both a global and local level to limit future climate change. The key here is limiting cumulative CO2 (carbon dioxide) and CH4 (methane) emissions and quickly reaching (at least) net zero CO2 emissions. And, to specifically reduce occurrences of HABs While the IPCC report conclusions may be depressing, there is still much we can do at both a global and local level to limit future climate change. The key here is globally limiting cumulative CO2 (carbon dioxide) and CH4 (methane) emissions and quickly reaching (at least) net zero CO2 emissions. And, to specifically reduce occurrences of HABs fueled by climate change in Lake Hopatcong, eliminating sources of phosphorus from entering the lake is critical. So what can we do in the Musconetcong River Watershed?
In 2019, NJ Department of Environmental Protection committed $13.5 million via their Water Quality Restoration Grant programs for local projects that aim to improve water quality and help prevent, mitigate and manage HABs in New Jersey’s lakes and ponds. The Lake Hopatcong Commission landed a $500k grant via the program to evaluate and implement a variety of innovative, nearshore projects to address HABs at Lake Hopatcong. Projects included performing an alternative non-copper-based algaecide treatment and one of the largest nutrient PhosLock treatments in the Northeast on the lake as well as the installation of Biochar bags, near-shore aeration systems, and floating wetland islands. This could not be possible without the help of all project partners including Lake Hopatcong Foundation, Morris County, Sussex County, Jefferson Township, Borough of Hopatcong, Borough of Mt. Arlington, and Roxbury Township, who collectively contributed over $330k in match support. The Lake Hopatcong Commission also landed a subsequent $206,000 grant via NJDEP’s 319 program a few months later, with $44,000 in match support from the four municipalities and Lake Hopatcong Foundation and Commission, for the design and implementation of four in-lake/watershed projects to prevent and mitigate HABs on Lake Hopatcong.
The results of these projects were significant. Over the last two years, the mean June TP concentrations were lower than 2019 (0.033 mg/L in 2020 and 0.020 mg/L in 2021). These in-lake and watershed efforts have had a positive impact on reducing available phosphorus and, in turn, reducing the size and magnitude of HABs on Lake Hopatcong.
Just this month, Lake Hopatcong Commission landed another $480k from a National Fish and Wildlife Foundation Delaware Watershed Conservation Fund grant, which was backed with $489k more in match support from Lake Hopatcong Commission, Lake Hopatcong Foundation, Musconetcong Watershed Association, NJDEP, Borough of Hopatcong, Township of Roxbury, Mount Arlington Borough, Morris and Sussex Counties, Lake Hopatcong Historical Museum, Rutgers University, NJ Highlands Council, and Princeton Hydro. The project team will design and implement three streambank stabilization projects in the watershed, which were identified as priority projects in the 2021 Upper Musconetcong River Watershed Implementation Plan.
“Managing loads of phosphorous in watersheds is even more important as the East Coast becomes increasingly warmer and wetter thanks to climate change. Climate change will likely need to be dealt with on a national and international scale. But local communities, groups, and individuals can have a real impact in reducing phosphorous levels in local waters.”Dr. Fred Lubnow, Director of Aquatics for Princeton Hydro
“Managing loads of phosphorous in watersheds is even more important as the East Coast becomes increasingly warmer and wetter thanks to climate change. Climate change will likely need to be dealt with on a national and international scale. But local communities, groups, and individuals can have a real impact in reducing phosphorous levels in local waters.”
Changes in hydrology, water chemistry, biology, or physical properties of a lake can have cascading consequences that may rapidly alter the overall properties of a lake and surrounding ecosystem, which can lead to negative consequences like HABs. Recognizing and monitoring the changes that are taking place locally brings the problems of climate change closer to home, which can help raise awareness and inspire environmentally-minded action.
The Musconetcong Watershed Association is an independent, non-profit organization dedicated to protecting and improving the quality of the Musconetcong River and its watershed, including its natural and cultural resources. Since 2003, Princeton Hydro has been working with MWA in the areas of river restoration, dam removal, and engineering consulting. Learn more:
As of October 1, the Maryland State Programmatic General Permit (MDSPGP), which is used to authorize all types of work in all waters, including wetlands, has been reissued. In this blog, Princeton Hydro’s Senior Environmental Scientist Duncan Simpson, PWS, provides a breakdown of the newly revised terms and conditions of the permit.
The MDSPGP was developed with the Maryland Department of Environment (MDE), which has regulatory authority over all waters throughout the state of Maryland. The MDSPGP helps to ensure a streamlined authorization process for certain work in waterbodies and waterways, and is designed to improve the regulatory process for applicants, reduce unnecessary duplicative project evaluations, and promote more effective and efficient use of U.S. Army Corps of Engineers (USACE) resources while providing equivalent environmental protection for aquatic resources.
Projects approved under the MDSPGP-5 permit that commenced prior to September 30, 2021 have been given 12 months to complete the work under the terms and conditions of the old permit. Projects that started after September 30, 2021 must meet the terms and conditions of MDSPGP-6 and in some cases receive written re-authorization.
The revised permit allows for activities that have minimal adverse environmental effects, and like MDSPGP-5, splits the review of activities into two categories: Category A and Category B. If proposed activities meet the provided Category A conditions and requirements, no USACE review is required.
The most significant change is the eligibility for Category B activities. The eligibility is no longer determined based on total temporary and permanent impacts. Instead, the primary threshold measurement for determining whether a project qualifies for authorization under the MDSPGP-6 is the total acreage of “loss of Waters of the United States.” The loss threshold is generally one-half-acre of total tidal and non-tidal waters, including streams, wetlands, and open waters. And, the loss of streams may not exceed 1,000 linear feet.
Another important revision changes how the USACE assesses permanent wetlands conversion. Under the MDSPGP-5, the permanent conversion of wetland type (e.g., forested to emergent) is considered a temporary impact and counted towards the Category B thresholds. Under MDSPGP-6, however, the conversion is considered a temporary impact but DOES NOT count towards the Category B thresholds, though the USACE may require compensatory mitigation for the loss of function.
Additionally, under the MDSPGP-6, the USACE now allows dredged material to be placed in a beneficial reuse site, under activity A(10) New Minor Dredging in Tidal Waters Category B. The material must be tested and shown to be clean in compliance with Evaluation of Dredged Material Proposed for Discharge in Waters of the United States-Testing Manual: Inland Testing Manual. The applicant must identify the intent to place the dredged material in Water of the U.S. at the proposed placement site and provide exact quantities of those dredged materials. And, the discharge of dredged or fill material must be authorized under activity f(2) Living Shorelines/Beach Nourishment Category B.
Activity f(2) has been renamed from "Tidal Marsh Creation/Beach Nourishment” to “Living Shorelines/Beach Nourishment.” Under f(2) Living Shorelines/Beach Nourishment, the Category A review now allows for vegetated wetlands impacts up to one-square-foot per linear foot of activity along the shoreline. The Category B review of this activity allows for impact to Submerged Aquatic Vegetation (SAV) but the applicant must show that the impacts were minimized to the maximum extent practicable.
Category B also now allows up to one-half-acre of tidal wetland loss, but does not allow for any overall net loss of wetlands. In other words, a living shoreline or beach nourishment project can permanently impact up to one-half-acre of tidal wetlands if an equal amount of non-tidal wetlands are created by the activity.
Perhaps the most interesting change is that a new activity has been added to the MDSPGP-6, e(11), Aquatic Habitat Restoration, Enhancement, and Establishment Activities Associated with Compensatory Mitigation Requirements for Aquatic Resource Impacts Authorized under the MDSPGP-6.
This new activity allows for mitigation projects to be authorized under a more streamlined process than the Nationwide Permit 27. The projects must still meet the State of Maryland and federal compensatory mitigation requirements. Category A allows activities required to meet the compensatory mitigation requirements to offset permanent impacts from an approved Category A activity. The Category B similarly allows compensatory mitigation activities for offsetting the losses from an approved Category B project.
The MDSPGP-6 also has new general conditions, and a few are worthy of discussion: Temporary fill, structures, and mats used for site access lasting longer than 12 months now require Category B review. Any proposed work in Critical Habitats (i.e., sections of the Potomac River, Nanticoke River, and Marshyhope Creek) or National Estuarine Research Reserves require Category B review.
The permit update also includes new conditions that support aquatic organism passage. Pipes and culverts must now be countersunk below the natural stream invert, while still allowing for ordinary high water to pass through them, which . In cases of bedrock or pipes being placed over existing underground utilities that would prevent countersinking, documentation is required. Also, extensions to existing pipes and culverts are exempt from this requirement. Finally, if countersinking is not practicable, then Category B review is required.
Speaking of fish passage, the conditions for anadromous fish time of year restrictions are now consolidated into a single general condition. To protect migratory pathways and spawning activities, for any project that is located within tidal and non-tidal coastal plain streams or piedmont streams in Harford and Cecil Counties, in-stream work is not allowed to be conducted between February 15 and June 15.
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If you have a project authorized under MDSPGP-5 that needs reauthorization, or if you have questions about the MDSPGP-6, how your projects might be affected by it, or other Maryland permitting questions, please contact us. If you’re interested in learning more about the wide variety of engineering and environmental services Princeton Hydro offers, go here: princetonhydro.com/services.
For over a decade, Duncan has served as an Environmental Scientist/Planner in the Mid-Atlantic Region. His experience includes a wide range of natural resource studies, documentation, and permitting at both the project and program level. He has special expertise in wetlands; Waters of the US delineations; and permitting for stormwater management facilities, stream restoration, and TMDL program projects. Duncan is a certified Professional Wetland Scientist, a member of the Society of Wetland Scientists, and earned his Maryland Biological Stream Survey (MBSS) Fish Crew Leader certification. He is the only person to have earned this prestigious certification in 2020. He also successfully completed the MBSS Physical Habitat Assessment.
The Princeton Hydro team is proud to be participating in and sponsoring a variety events focused on conserving, restoring, and protecting our precious water resources. In this edition of our Events Spotlight, we provide a snapshot of upcoming events this Fall and information on how to get involved:
Do you have questions about harmful algal blooms? Now is your chance to get answers! Join us on Tuesday, October 5 at 6:30 PM EDT for a "Facebook Live" conversation with two of Princeton Hydro's HAB experts, Dr. Fred Lubnow and Mike Hartshorne. Participants will get an overview of HABs and engage in a live Q&A session. You can submit a question by joining the live feed and typing in the comments. Get more info and register.
This year’s conference features a mix of in-person and virtual events, including informative keynotes; local, State, and Federal agency panels; networking sessions; training workshops; webinars; and two special field trip activities. Princeton Hydro is honored to sponsor MEGA Maryland, which is seen as the premier event for the architecture, engineering, and construction industry. Our Director of Marketing, Dana Patterson, will be exhibiting at the in-person portion of the event. Get more info and register.
Presented by the Friends of Hopewell Valley Open Space and hosted by Duke Farms, the 2021 Annual New Jersey Invasive Species Strike Team Conference will focus on the use of prescribed burning to combat invasive species. Princeton Hydro is sponsoring this event, which is being held outdoors under a tent. We look forward to seeing you there in October! Get more info and register.
Join NJ-AWRA and Princeton Hydro for a tour of the Award-Winning Linden Blue Acres Green Infrastructure & Floodplain Restoration Project. This project set the precedent for enhancing ecological and floodplain function on flood-prone properties acquired by the NJDEP Blue Acres Program. This event is approved for one (1) credit hour of continuing education for Certified Floodplain Managers. Get more info and register.
Western Connecticut State University presents its Fall 2021 Regional Lake Communities Symposium “Fall Science at Night Virtual Seminar Series." The seminar, titled “Threats to Our Lakes: Beyond Aquatic Invasive Plants,” welcomes members of the public, students, and scientists to participate in a variety of workshops focused on local lake conservation and management. Princeton Hydro’s Director of Aquatic Programs Dr. Fred Lubnow is presenting “The Lake Hopatcong (NJ) Story.” Get more info and register.
Join Restore America's Estuaries, American Littoral Society, NJDEP and the Chesapeake Bay and New Jersey field offices of the USFWS for the Living Shorelines & Nature - Based Methods Tech Transfer Workshop. The workshop, which is being held both virtually and in-person at the Grand Hotel in Cape May, NJ, features field trips to local restoration projects, workshops, networking events, and an exhibit hall. Princeton Hydro is a proud sponsor of the event and our Director of Marketing & Communications Dana Patterson is exhibiting! Please note: Attendees must provide confirmation of COVID-19 vaccination as part of registration. Get more info and register.
We are thrilled to sponsor the 48th Annual Environmental Congress, which is being held in an all-virtual Zoom format. Each day includes a variety of workshop sessions on topics like stormwater management, environmental justice advancement in New Jersey, and local climate action. The closing session on Friday includes entertainment by Musician Maxwell Kofi Donkor. Get more info and register.
Princeton Hydro’s Senior Project Manager and Senior Aquatic Ecologist Chris L. Mikolajczyk, CLM, is giving a Halloween-inspired presentation titled "In Celebration of All Hallows Eve: Reflections of a Study on One of the Spookiest Lakes in the U.S." This free, one-day conference will be held virtually and is open to he public. Get more info and register.
The 16th Annual Conference will be held at the Hard Rock Casino Hotel in Atlantic City. With more than 40 speakers lined-up, conference workshops will focus on a robust array of floodplain management topics, including flood hazard identification and mapping; flood hazard mitigation; technical assistance and training; and natural resource protection and enhancement. Princeton Hydro is happy to sponsor this event and our Director of Marketing, Dana Patterson, will be attending and exhibiting. Get more info and register.
The theme of the 26th Biennial CERF Conference is "CERF at 50: Celebrating Our Past, Charting Our Future." The virtual, eight-day conference aims to connect science and society in the collective goals of preserving coastal and estuarine habitats, resources, and heritage. The conference, which is expected to draw 1,300+ scientists and researchers from all over the world, includes a virtual exhibit hall, networking events, a film festival and a variety of workshops. Johnny Quispe, Princeton Hydro Natural Resources Project Manager, is presenting on November 3 at 10 AM as part of the session on "Transdisciplinary design and adaptation for sustainable, resilient urban coastlines: realizing triple-bottom line outcomes." His presentation features The South River Ecosystem Restoration & Flood Resiliency Enhancement Project. Get more info and register.
The Watershed Institute’s 5th Annual Watershed Conference will be in a hybrid format with participants selecting socially distanced, in-person sessions at the Watershed Center and Reserve or choosing to attend virtually if they prefer. Princeton Hydro is sponsoring the event and leading two workshops. Our Director of Green Infrastructure and Stormwater Management, Dr. Clay Emerson, P.E., CFM, along with Kathy Hale, Principal Watershed Protection Specialist, NJ Water Supply Authority, is presenting on “Naturalizing Detention Basins.” And, Vice President Mark Gallagher, along with Patrick Ryan of the NJDEP, is presenting on "Understanding Permit Requirements for Conservation Activities." Get more info and register.
Science professionals from throughout the world will come together for this hybrid-format event offering both virtual and in-person participation opportunities. This year's conference, themed “Investing in People, Habitat, and Science” includes scientific sessions, a poster hall, a tradeshow and exhibits, and a variety of Plenary Speakers. Princeton Hydro President Geoffrey Goll is presenting on, "Dam Removal in History, Current State of Removal, and Future Needs." Get more info and register.
The Northwest New Jersey Rivers Conference is coordinated by the New Jersey Highlands Coalition, with the support of partner organizations in the Highlands and Ridge & Valley regions of New Jersey. Together, these groups are collaborating to restore water quality under the four-state Delaware River Watershed Initiative. The 2021 Conference, held in an online-only format, will focus on three key themes, "Sustainability & Economic Development," "Land Use Planning & Conservation," and "Water Quality Monitoring & Management." The conference is free and open to the public, and includes a variety of presentations, workshops and a virtual exhibitor hall. Princeton Hydro is exhibiting. Get more info and register.
Princeton Hydro is sponsoring the NALMS 2021 International Symposium, which will be held virtually. The event consists of multiple panels and discussions focused on the value of water for economics, ecology, and culture. Senior Project Manager Christopher L. Mikolajczyk, CLM is giving a presentation titled "A Public-Private Approach to Lake and Watershed Management in the Highlands Region of New Jersey.” Our Director of Aquatic Resources, Dr. Fred Lubnow, is presenting on "Monitoring and Management of HABs in New Jersey Waterbodies From 2019 to 2021." Get more info and register.
This one-day virtual summit, hosted by the The Camden Collaborative Initiative, focuses on preserving the environment in the city of Camden. Princeton Hydro is proud to sponsor this event, which is free for Camden residents and students, and $25 for all other attendees. Get more info and register.
Stay Tuned for More!
If you’re looking for a way to solve drainage issues in your yard and put rainwater to good use, look no further than a rain garden. Rain gardens are a cost effective, attractive, and sustainable way to minimize stormwater runoff and filter out pollutants. This aesthetic, low-maintenance addition to any outdoor landscape creates a functioning habitat that attracts pollinators, beneficial insects, and birds. And, in a small way, it helps reduce erosion, promote groundwater recharge, and minimize flooding.
A rain garden is an excavated depression in the landscape that is planted with wetland or wet-tolerant plants. It captures a portion of stormwater runoff from a targeted area (i.e., rooftop, walkway, or driveway). Even if it intercepts the first one inch of rain and the rest overflows, it will still capture about 90% of the total annual rainfall.
The concept of rain gardens are becoming mainstream and there are many, many online resources to obtain design guidelines. In fact, even “This Old House”, a PBS stalwart, has an instructional page to help guide the design process!
"After repeated stormwater drainage issues near my home’s foundation due to flat topography, I opted to go the environmentally-friendly route of installing a rain garden in my front yard."
Princeton Hydro President Geoff Goll, P.E. recently installed a rain garden at his home and documented the process and put together step-by-step instructions on how to build your own:
Where does your stormwater flow? A rain garden is designed to infiltrate water, so it is best to build your rain garden in an area where rainwater will feed into it from downspouts, driveways or low points in your yard.
In order to determine if the soil at your selected location will readily infiltrate runoff, dig a few test holes. An optimal location will achieve one inch per hour of infiltration (i.e. the hole empties in 8 hours) and a good location will achieve one-half inch per hour (empties in 16 hours). If it is slower than 24 hours, you should consider a new location.
Determine the size and shape of your garden. Geoff chose a circular shape for his garden.
IMPORTANT! Before you dig, you MUST call your state’s dig-safe number (811) at least 72 hours before putting a shovel in the ground. It’s the law! They will mark-out your property for free so that you don’t unintentionally dig into any underground utility lines.
Depending on whether you will hand-dig your rain garden (as Geoff did) or rent a small excavator (you can rent one from Home Depot or local equipment rental centers), will dictate how much time the effort will take. Prepare your garden by removing all of the grass. If you can, separate the topsoil for later use or for other areas of your property.
Start digging out the area until you reach the proposed bottom depth. In some cases, you may have to dig a little further down to reach more adequate soils for infiltration. The sides of the hole should form a gentle slope toward the middle and create a berm around the perimeter that ensures the garden will hold water in when it rains.
Tip: For excavated soil that’s not reused in your rain garden, find it a home by filling in low areas in your lawn or stockpile it for later use.
Carve out a spillway by creating a small indentation in the berm of the rain garden, lining it with permeable weed control fabric, and filling it with decorative stone.The spillway will allow excess rain water to overtop and flow out of the garden should it overfill during a storm event.
Use some of the excavated soil to create a berm around the rain garden. Once depth for adequate infiltration is reached, begin filling the hole with sand, and continue to backfill it to the proposed final grade, making sure the bottom of the rain garden is 6 to 8 inches below the surrounding lawn. (Note: Geoff ordered 3 tons of sand for his project, however, this quantity will be custom to your site, so use your best judgement to determine how much you’ll need). Add leaf compost (about 4 lbs per square foot) to the top of the sand and hand-till the compost with a shovel to a depth of 12 inches.
Having native wetland or wet tolerant plants that can withstand periods of drought is the key to success. Use hardy perennial species with well-established root systems. For guidance, look to your local garden center and a niche plant nursery. Make the plant palette your own. (Note: Be on the lookout for deer resistant plantings if this is an issue in your area).
When it’s time for planting, place each plant 12 inches apart and dig each hole twice as wide as the plant plug. The crown of the plant should be level with the ground. Apply wood mulch over the bed. Water frequently until the plants are established. Later on, no watering will be necessary. The vegetation will fill in nicely over the next few seasons.
If you’re planning to connect your gutter to the rain garden, it’s a good idea to install the drainage pipe last so the project is not inundated with water after a rainstorm while it is still under construction.
It is very important to keep an eye on your rain garden, especially after rain, to ensure that it is emptying in a timely manner. The last thing you want is to have the neighbors complaining about the “mosquito pond” next door. Generally, all the water should be infiltrated into the soil within 24 hours.
“A week after I completed the installation of the rain garden, we received over 4 inches of rain within a 5 day period, and then, we were hit with Tropical Storm Ida with 4.29 inches of rain (from my home rain gage) in a period of less than 24 hours. The rain garden worked very well, and even after Ida, the rain garden infiltrated all the water retained in the bottom within an 8 hour period (about an inch per hour).”
Each season, pull weeds, remove debris, and replenish the mulch as needed in order to help retain moisture and block weeds.
“During the construction, I’m sure my neighbors were judging the ugly hole in my front lawn. And, my wife even marked herself as “Safe from the Hole” on Facebook! However, when it was finished, she was pleasantly surprised at how pretty the rain garden looked and amazed at how it managed stormwater,” said Geoff. “If everyone in my neighborhood installed a rain garden, imagine the positive reduction in stormwater and flooding that would occur downstream. Plus, we’d have some pretty awesome looking native flowers and grasses around for the pollinators and wildlife.”
Just 50 miles southeast of New York City, tucked between two municipalities, sits a 650+ acre tidal salt marsh which spans the shorelines of the South River in densely populated, highly developed Central New Jersey. The South River is the first major tributary of the Raritan River, located 8.3 miles upstream of the Raritan River’s mouth, which drains into Raritan Bay.
The Lower Raritan River and Raritan Bay make up a large part of the core of the NY-NJ Harbor and Estuary Program. Within the Raritan Estuary, the South River wetland ecosystem is one of the largest remaining wetland complexes. While the South River salt marsh ecosystem has been spared from direct development, it has been degraded in quality, and does not provide optimal habitat for wildlife or maximum flood protection for residents. This area is subject to fairly regular tidal flooding (particularly when it occurs simultaneously with a storm) and periodic—generally more severe—flooding during more significant events such as nor’easters and tropical storms. Hurricanes Irene and Sandy caused damage in the Boroughs of Sayreville and South River too.
In 2018, Princeton Hydro and Rutgers University, along with the Lower Raritan Watershed Partnership, Middlesex County, Borough of Sayreville, Borough of South River, NY/NJ Baykeeper, Raritan Riverkeeper, and the Sustainable Raritan River Initiative, secured funding from NFWF’s National Coastal Resilience Fund for the “South River Ecosystem Restoration & Flood Resiliency Enhancement Project.”
The South River Ecosystem Restoration and Flood Resiliency Enhancement Project aims to:
For this 165-acre tidal marsh and transitional forest “eco-park,” the project team is conducting an ecosystem restoration site assessment and design. This phase of the coastal restoration project will result in a permit-ready engineering design plan that stabilizes approximately 2.5 miles of shoreline, reduces flood risk for smaller coastal storms, and enhances breeding and foraging habitat for 10 state-listed threatened and endangered avian species.
This area has experienced repeated flooding, especially during large storms. For example, coastal areas of Sayreville and South River flooded after Hurricane Floyd (1999), Tropical Storm Ernesto (2006), Hurricane Irene (2011), and Hurricane Sandy (2012). Over the last century, there have been several studies and assessments completed for the South River, many of which identify this project area as a priority location for flooding improvements. The following are key reports and studies published about the project area and surrounding communities:
1930s
1970s
1980s
1990s
2000s
Through collaboration with our project partners and following input provided from a virtual stakeholder meeting held in December 2020, Princeton Hydro developed a conceptual design for an eco-park that incorporates habitat enhancement and restoration, and protective measures to reduce impacts from flooding while maximizing public access and utility. Public access includes trails for walking and designated areas for fishing. The eco-park can also be used for additional recreation activities such as bird watching and kayaking.
Highlights of the conceptual design include the following features:
Princeton Hydro specializes in the planning, design, permitting, implementing, and maintenance of ecological rehabilitation and floodplain management projects. Read about a coastal rehabilitation and resiliency project we recently completed in New Jersey:
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