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Princeton Hydro was specifically tasked with the completion of scour analyses for 13 individual major highway bridges. These bridges were distributed throughout the state and included structures in both the coastal plain and piedmont physiographic provinces. The road crossings at the focus of the study range from single lane exit ramps to five-lane single direction major highways. The average daily traffic load of combined 13 road crossings which were studied is 1.3 million vehicles per day. The detailed Phase II studies were conducted on structures which were previously identified during separate Phase I scour investigations and Biennial Bridge Inspection Reports. Inspections and investigations ultimately either confirmed the existing Federal Highway Authority Structure Inventory and Appraisal of the Nation’s Bridges (SI&A) codes including Items 61 (Channel and Channel Protection), Item 71 (Waterway Adequacy) and Item 113 (Scour Critical Bridges). Princeton Hydro provided a wide range of services as it related to the scour assessments. These services included field inspection service planning and logistics as well and watercraft access to bridge structures. In-field engineering inspections of bridge structures with a focus on scour were also completed for the 13 structures. These inspections included the collection of photographs of the bridge and surrounding channel conditions as well as the collection of representative soil samples. The soil samples were then delivered to our in-house soil laboratory, which is accredited under the American Association of State Highway and Transportation Officials (AASHTO) Accreditation Program (AAP), for analysis with the results of the soil analyses being applied in the scour analysis hydraulic calculations. Our engineering services included a detailed review of previous documentation for each bridge including original as-built drawing, previous inspection reports, and other National Bridge Inspection Standards (NBIS) reporting. The Phase II detailed scour analysis also included a hydrologic analysis for each road crossing with consequent hydraulic modeling of the bridge structure and stream channel being performed in HEC-RAS. Results from HEC-RAS were then used to conduct additional scour analysis in the Federal Highway Administration Hydraulic Toolbox. [post_title] => New Jersey Turnpike Authority Phase II Detail Scour Analysis [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => new-jersey-turnpike-authority-phase-ii-detail-scour-analysis [to_ping] => [pinged] => [post_modified] => 2025-06-03 11:47:38 [post_modified_gmt] => 2025-06-03 11:47:38 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=17622 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 17621 [post_author] => 1 [post_date] => 2025-06-03 11:31:15 [post_date_gmt] => 2025-06-03 11:31:15 [post_content] => Over 40 years ago, Mercer County purchased 279 acres of flood-prone land along Miry Run as part of a restoration and flood mitigation initiative. In 2018, Mercer County Park Commission (MCPC) contracted Princeton Hydro and Simone Collins Landscape Architecture to develop the Miry Run Ponds Master Plan with three primary goals: (1) Provide passive recreation to complement other County activities; (2) Preserve and enhance the habitat, water quality, and natural systems that currently exist onsite; and (3) Provide linkage to adjacent trails and parks. [caption id="attachment_7488" align="alignnone" width="1024"] Miry Run Ponds Master Plan won the 2021 Landscape Architectural Chapter Award from the American Society of Landscape Architects New Jersey Chapter.[/caption] The team assessed the land area and proposed a concept plan to enhance the area and create recreational lake activities. Applying expertise in science-based assessment and evaluations, we performed:
Princeton Hydro was part of a two-firm team tasked with the completion of Phase II detail scour analyses for the New Jersey Turnpike Authority (NJTA), a major state-wide transportation authority. Princeton Hydro was specifically tasked with the completion of scour analyses for 13 individual major highway bridges. These bridges were distributed throughout the state and included structures in both the coastal plain and piedmont physiographic provinces. The road crossings at the focus of the study range from single lane exit ramps to five-lane single direction major highways. The average daily traffic load of combined 13 road crossings which were studied is 1.3 million vehicles per day.
The detailed Phase II studies were conducted on structures which were previously identified during separate Phase I scour investigations and Biennial Bridge Inspection Reports. Inspections and investigations ultimately either confirmed the existing Federal Highway Authority Structure Inventory and Appraisal of the Nation’s Bridges (SI&A) codes including Items 61 (Channel and Channel Protection), Item 71 (Waterway Adequacy) and Item 113 (Scour Critical Bridges).
Princeton Hydro provided a wide range of services as it related to the scour assessments. These services included field inspection service planning and logistics as well and watercraft access to bridge structures. In-field engineering inspections of bridge structures with a focus on scour were also completed for the 13 structures. These inspections included the collection of photographs of the bridge and surrounding channel conditions as well as the collection of representative soil samples.
The soil samples were then delivered to our in-house soil laboratory, which is accredited under the American Association of State Highway and Transportation Officials (AASHTO) Accreditation Program (AAP), for analysis with the results of the soil analyses being applied in the scour analysis hydraulic calculations.
Our engineering services included a detailed review of previous documentation for each bridge including original as-built drawing, previous inspection reports, and other National Bridge Inspection Standards (NBIS) reporting. The Phase II detailed scour analysis also included a hydrologic analysis for each road crossing with consequent hydraulic modeling of the bridge structure and stream channel being performed in HEC-RAS. Results from HEC-RAS were then used to conduct additional scour analysis in the Federal Highway Administration Hydraulic Toolbox.
Over 40 years ago, Mercer County purchased 279 acres of flood-prone land along Miry Run as part of a restoration and flood mitigation initiative. In 2018, Mercer County Park Commission (MCPC) contracted Princeton Hydro and Simone Collins Landscape Architecture to develop the Miry Run Ponds Master Plan with three primary goals: (1) Provide passive recreation to complement other County activities; (2) Preserve and enhance the habitat, water quality, and natural systems that currently exist onsite; and (3) Provide linkage to adjacent trails and parks.
The team assessed the land area and proposed a concept plan to enhance the area and create recreational lake activities. Applying expertise in science-based assessment and evaluations, we performed:
Our project team facilitated focus groups with local municipalities, residents, interest groups, and County stakeholders to seek their input and report on site evaluation findings. In partnership with the County, we held public meetings to gather feedback on the conceptual site designs. This helped to inform the park planning process and determine how best to manage the site to meet the needs of the community and future generations.
The final Miry Run Pond Master Plan goes above and beyond the original vision, proposing considerable improvements to the area prioritizing valuable natural features, including 34 acres of reforestation, 64 acres of new meadows, 19 acres of vernal pools, and 7.9 miles of walking trails. It serves as a long-term vision and will be implemented over multiple phases. Dredging of the lake began in 2023.
Keen Road, a local, rural roadway in East Vincent Township is scheduled to be repaved in 2025. There are four culverts under Keen Road that are in poor condition and need to be replaced, with one of them containing an active stream traveling through it. There are erosion issues and safety issues with culverts on both sides of the road, with erosion beginning to undermine the road itself.
Princeton Hydro was contracted by East Vincent Township to develop construction plans to replace the culverts and address the safety and erosion issues before Keen Road is repaved later in 2025. Princeton Hydro had the project area surveyed and used public LiDAR data to build a watershed model to calculate the flow through each of the culverts to determine if they were sized correctly. Without any record drawings of these culverts, Princeton Hydro had to work from scratch to understand how the system currently works and if there would be any ways to improve the performance of the system. Princeton Hydro also coordinated with local and state permitting agencies to attain the necessary permits to install the new culverts.
At the request of the local residents, Princeton proposed to modify the existing layout of the culverts to eliminate the need for two guide rail structures. Princeton Hydro also designed a series of grade control structures along the eastern upstream side of the project area to eliminate the source of the erosion and provide erosion protection along the roadway to stop the undermining of the road. The grade control structures reduce the velocity of the runoff to reduce erosion while also providing armor to provide further protection against erosion. Finally, erosion control measures such as a rip rap apron were designed at the discharge to provide protection from erosion on the downstream side of Keen Road.
The project was put out to bid in November 2024 and is scheduled for construction this Spring 2025.
In 2012, Hurricane Sandy left numerous NJ communities with storm damage to homes and infrastructure including Naval Weapons Station (NWS) Earle, which incurred approximately $50M in installation damages that not only impacted mission readiness, but also impacted neighboring communities, where the majority of the installations’ military and civilian employee population resides. It is expected that NWS Earle and its surrounding communities may experience increased frequent flooding from tidal waters and storm surge, adversely affecting ecosystems and presenting challenges to installation resilience and readiness. In response to these past occurrences and the threat of future related coastal hazards, Monmouth County, in cooperation with NWS Earle and the 13 municipalities that surround it, published a Joint Land Use Study in 2017, which defined several goals related to adapting to sea level rise and improving resiliency from future storm events. In 2019, the cooperative published the Raritan/Sandy Hook Bay Coastal Resilience Planning Study (Bayshore Study) which identified potential coastal resilience projects within the region that could improve sustainability and resiliency from current and future coastal hazards and sea level rise.
In 2021, Monmouth County commissioned Princeton Hydro to advance the goals of the Bayshore Study through the Bayshore Coastal Resilience Design Study. The goal of this study is to develop conceptual coastal resilience designs for two of the Bayshore Study projects located on coastal wetlands along Whale Creek in Aberdeen Township and Flat Creek in Union Beach Borough. We conducted site assessments that included desktop investigation, bio-benchmarks, and hydrologic monitoring; completed hydrodynamic modeling to assess the impacts of storms and sea level rise; and developed conceptual restoration designs for both sites. Restoration strategies included removal of invasive species, planting of native species, enhancement of hydrology, and fostering marsh migration. Conceptual designs were presented to a Technical Advisory Committee to solicit feedback for further project development.
This project provided an opportunity to work closely with Monmouth County on an effort to address the threat of future coastal hazards through marsh restoration. The project resulted in the development of conceptual designs for restoration of the tidal marsh ecosystems at Whale Creek and Flat Creek as well as a detailed study report to support those designs.
Princeton Hydro provided consulting engineering services for the National Resources Defense Council (NRDC) concerning the implementation of the recently amended New Jersey Stormwater Management Rules. Modifications to the Stormwater Management Rules were considered which would require the use of Green Infrastructure measures to satisfy the groundwater recharge, peak flow control, and water quality requirements.
The purpose of Princeton Hydro’s consulting services was to quantify the impact of the amended rules on typical land use development within the State and to provide technical assistance to the NRDC as part of their public comment. This effort included detailed modeling and hydrologic and hydraulic calculations of hypothetical land development applications with the implementation of various Green Infrastructure measures.
An additional component of Princeton Hydro’s consulting engineering services was the participation in stakeholder meetings to discuss the potential for applicant credit for infiltration towards their peak flow rate criteria. Princeton Hydro supported the need for physically-based and scientifically sound approaches to the issue which do not jeopardize downstream properties and receiving water bodies.
Additionally, Princeton Hydro provided technical support and additional hydrologic and hydraulic calculations to quantify the impact of changing precipitation patterns on the stormwater management design process in New Jersey. The State is currently considering additional amendments to the stormwater rules which may incorporate provisions for predicted future rainfall intensities.
Princeton Hydro performed a flood assessment and flood mitigation resiliency analysis for the communities within the Lower Moodna Creek Watershed (Cornwall, New Windsor, Cornwall-on-Hudson, and Woodbury) using funds from a 2016 grant program sponsored by the New England Interstate Waters Pollution Control Commission (NEIWPCC) and the NYSDEC-Hudson River Estuary Program (HREP).
The greater Moodna Creek Watershed covers 180 square miles of eastern Orange County. The watershed includes 22 municipalities and hundreds of smaller streams that flow into Moodna Creek and ultimately the Hudson River. Many of the areas within both the Upper and Lower Moodna watersheds are highly prone to flooding during rainfall events. This vulnerability to high-water events was most clearly exposed between August 2011 and October 2012, when this region experienced three extreme weather events.
In one year, Hurricane Irene, Tropical Storm Lee, and Hurricane Sandy caused significant flooding throughout the Moodna Creek Watershed, damaging several public facilities, roadways, and private properties. The Upper Moodna watershed was studied as part of the 2014 New York Rising Community Reconstruction Program.
Our primary goal was to identify areas within the study area that have reoccurring flood issues, may be susceptible to damage from large rain events, and additional problems may surface as climate and watershed conditions change over time. Part of this goal was also to develop structural and non-structural strategies to mitigate flooding. Princeton Hydro staff conducted site investigations and reach assessments at sites with critical infrastructure and photo-documented existing structures, infrastructure, and channel and floodplain conditions. The team recorded signs of recent disturbances, man-made impacts, flooding, and floodplain constrictions. They conducted visual assessments to collect data on flow constrictions, areas of floodplain development, and areas of floodplain connection. This helped identify at-risk areas and ground-truth our hydrologic and hydraulic models for current and future risk.
Princeton Hydro modeled flooding within the watershed during normal rain events, extreme rain events, and future rain events due to climate change. The project assessed the facilities, infrastructure, and urban development that are at risk from flooding along Moodna Creek and its tributaries and developed a series of hydrologic and hydraulic (H&H) models to assess the extent of potential flooding from the 10-year, 100-year, and 500-year storm recurrence intervals. The modeling included flows for these storm events under existing conditions and hypothetical scenarios with predicted increases in precipitation and population growth. The project team proposed and evaluated a series of design measures to help reduce and mitigate existing and anticipated flood risk. The proposed solutions prioritized approaches that protect and/or mirror natural flood protection mechanisms within the watershed such as floodplain reconnection and wetland establishment.
Overall, the analyses and recommendations, in conjunction with the modeling and conclusions developed for the Upper Moodna, resulted in a fully developed flood assessment master plan and flood mitigation plan that can serve as a roadmap for reducing flooding issues within the entire Moodna Creek Watershed.
Liberty State Park is located on the west bank of Upper New York Bay and is one of the most visited state parks in the nation with over 5.1 million visitors in 2018. Princeton Hydro was contracted to design a resilient coastal ecosystem within 235 acres of this highly urbanized setting that provides both ecological and social benefits. This includes the restoration of over 80 acres of tidal and non-tidal wetlands and creation of several thousands of feet of intertidal shoreline and shallow water habitat hydrologically connected to the Upper New York Bay.
Historically, the site contained intertidal mudflats and shallow water habitat, which were filled and developed as a railroad yard. Once constructed, this project will expand public access, improve water quality, restore native plant communities, and improve coastal resiliency for urban communities that are vulnerable to storm events. The site design includes a trail network for the park interior that will provide access to the newly established habitat zones and views of the Statue of Liberty and New York City skyline. This trail network will enhance pedestrian connectivity between the existing portion of Liberty State Park, Liberty Science Center, Jersey City, and local public transit hubs.
To inform the design development, our team conducted design charrettes with various stakeholders and a myriad of monitoring tasks focused on site characterization including a wetland delineation; bio-benchmarking surveys of the tidal marsh vegetation communities; topographic, bathymetric, and utility surveys; and geotechnical sampling such as SPT borings and test pits. Field data and observations were incorporated into various analyses to support the engineering design including a 2D Hydrologic and Hydraulic model and wave analysis, and a detailed Sea Level Rise Analysis to inform the design of various project elements to accommodate sea level rise projections through 2070. The tidal channel geometry, culvert width, and tidal marsh were designed to address increased flows and water surface elevations. Groundwater levels and flow direction were also characterized through the installation of monitoring wells and continuous measurements of the groundwater level using piezometers.
To support the design process, the team developed interim construction cost estimates for various design milestones and coordinated and advanced the local, state, and federal permit process and applications. As part of NJDEP’s public outreach campaign, our team participated in an open house interacting directly with members of the public. We produced a 4-minute video simulating the expected visitor experience using detailed engineering design renderings. When completed, this will be one of the largest ecosystem habitat restoration projects in New Jersey. Click below to watch the video now:
The Spring Creek (North) Ecosystem Restoration Project is located in the boroughs of Brooklyn and Queens, New York. In the early 1900’s, the salt marsh community of Spring Creek was part of the extensive coastal wetland community of Jamaica Bay, known for the abundance and diversity of its shellfish as well as its ecological importance as a nursery and feeding ground for countless species of birds and fish. The intertidal salt marsh and uplands have since been degraded by historic placement of dredged spoils and municipal waste, the construction of a sanitary sewer trunk line, ditching of the marsh, and urbanization of the watershed.
When completed, the project will restore approximately 43.2 acres of degraded habitat to 0.7 acres of low marsh, 12.9 acres of transitional and high marsh, 5.2 acres of scrub shrub wetland and 24.4 acres of maritime upland in an overall project footprint of 67 acres. Primary construction activities will include excavating and re-contouring uplands to intertidal elevations, thin layer placement of sand on the marsh platform to restore areas of degraded tidal wetland, removing invasive plant species, and replanting with native plant species. The overall project purpose is to improve the environmental quality (water, diversity, and wildlife habitat) of Spring Creek and its associated salt marshes as part of the overall Jamaica Bay Ecosystem.
Princeton Hydro was contracted by the US Army Corps of Engineers, New York District to lead the design and engineering. To inform the design development, a variety of site-specific data was collected including topographic, bathymetric, utility and tree surveys. Wetland delineation and vegetation characterization were performed, along with a bio-benchmark survey to establish marsh habitat boundaries; hydrodynamic data; and geotechnical borings. The data collected was analyzed and incorporated into the design, including a sea level change analysis; slope stability analysis; development of a hydrologic model and an unsteady 1-D hydraulic model; stormwater design; and wetland restoration design.
A concept design was developed in coordination with the US Army Corps of Engineers and New York City Parks, and the design was advanced via the preparation of 30%, 60%, 90%, and 100% design plans and technical specifications. Additionally, the required local, state, and federal permits were obtained, and a detailed construction cost estimate was developed.
The Martin Dam was constructed on an active farm in 1961 as part of USDA’s sustainable farms pond construction initiative. Martin Dam’s robust 4,000 cubic yards of placed dam material resulted in the impoundment of only 3.5 acres of surface water. Several years ago, during the removal of a beaver dam that was obstructing the dam outlet, the riser structure was inadvertently destroyed, and a large part of the earthen dam collapsed. Due to the damage, the dam was put under an enforcement action from the Maryland Department of the Environment (MDE) Dam Safety Program. Site investigations showed an outlet culvert in total disrepair and severe erosion of the dam and downstream areas.
Fearing the risk to property and life from a catastrophic dam failure, GreenTrust Alliance, in partnership with Princeton Hydro, were enlisted to design, develop, and enact an emergency dam breach. The earthen dam was approximately 20 feet in height and 490 feet in length, with an impoundment of approximately 3.48 acres. The contributing drainage area was approximately 0.25 square miles (160 acres) of low density residential land use and the primary inflowing channel, Overshot Branch, was intermittent or ephemeral. The assessment and design involved probing within the impoundment, which revealed water depths averaging 4.7 feet, with a maximum of 7.5 feet, and impounded sediment depths averaging 1.0 foot, with a maximum of 3.0 feet.
Princeton Hydro prepared a 35% design plan for the earthen dam removal, and this plan was subsequently approved by MDE Dam Safety with an emergency permit, forgoing the typical months-long design and review process. The dam breach was implemented in late 2018.
After the dam breach, Princeton Hydro completed a hydrologic and hydraulic assessment. Pre- and post-breach conditions were modeled to determine the potential increase in flood elevations to downstream properties. In addition, a dam failure was also modeled to assess the potential risks should the dam have failed. In comparing the pre-and post-breach scenarios, 100-year flood elevations increased between 0.01 and 0.29 feet for approximately 1 mile downstream of the pond. The floodplain valley for this stream was relatively narrow which means any increases in discharge translated to larger increases on peak flood elevations compared to the total width of the floodplain. However, the narrow floodplain also acted a barrier, ensuring that flooding was mostly contained to the area around the stream itself. No additional structures were inundated as a result of the breach.
Princeton Hydro, along with GreenVest and Green Trust Alliance, developed a design that enhanced in-stream habitat of the downstream reach, and allowed for passive wetland conversion and restoration of the former impoundment.
The objectives of the Upper Weadly Stormwater Improvement Projects are to address flooding within the Trout Creek watershed of Tredyffrin Township located in Chester County, Pennsylvania. The 70-acre watershed contains a suburban development consisting mostly of 1/2-acre resident lots. The watershed was developed prior to modern stormwater management requirements. As a result, the stormwater management infrastructure in place is undersized and in poor condition. The watershed suffers from chronic flooding that is a threat to the quality of life for the residents.
Princeton Hydro developed a hydrologic model of the entire 70-acre watershed and its existing stormwater system, which was used to find critical points in the existing stormwater system that are triggering localized flooding events. The model was built from both survey data collected in the field and as-builts provided by the Township. Princeton Hydro also was tasked with finding opportunities to use grey and green infrastructure to minimize flooding events. The size of the identified and proposed infrastructure was determined by the hydrologic model.
The Township officials and Princeton Hydro held two public meetings to engage residents of the neighborhood. The purpose of the first meeting was to introduce the project to the residents and gather information about localized flooding. The residents shared stories and information from flooding events they had witnessed over the years. The second meeting was to share the proposed improvements for the neighborhood and to garner support from the residents for the proposed changes.
The project is still in the design phase and is scheduled to go out to bid in September 2024.
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