EMPLOYEE SPOTLIGHT: Meet the Interns

This summer, Princeton Hydro is hosting five interns, each of whom are passionate about protecting water quality and preserving our natural resources. From June to August, our interns will gain professional work experience in a variety of subject areas, ranging from stormwater management to dam restoration to ecological design to lake management and much more. They are assisting on a variety of projects, getting real-world practice in their areas of study, and working with a Princeton Hydro mentor who is helping them gain a deeper understanding of the business of environmental and engineering consulting and setting them up for career success.

 

Meet Our Interns:

 

Ivy Babson, Environmental Science Intern

Ivy is a rising senior from University of Vermont, majoring in Environmental Science with a concentration in Ecological Design, and minor in Geospatial Technologies. In the future, she hopes to implement ecological design in urban areas and create a sustainable environment that would allow future generations to care for and interact with a healthy earth.

Ivy will work alongside Senior Aquatics Scientist Dr. Jack Szczepanski and the Princeton Hydro Aquatics team on projects related to lake and pond management, including fisheries management, data collection and analysis, and water quality monitoring. Recently, Ivy assisted Aquatic Ecologist Jesse Smith in completing an electrofishing survey in a Northern New Jersey river.

Learn more about Ivy.

 

Marissa Ciocco, Geotechnical Intern

Marissa is entering her fourth year at Rowan University where she is a Civil and Environmental Engineering major with a Bantivoglio Honors Concentration. In the future, Marissa hopes to work towards creating a greener and safer environment.

During her internship, Marissa will be mentored by Jim Hunt P.E., Geotechnical Engineer, who has already engaged Marissa in a few construction oversight projects, including a culvert restoration effort in Medford Lakes, NJ and observing geotechnical borings in Evesham, NJ.

Learn more about Marissa.

 

Will Kelleher, Environmental Science Intern

Will is a rising junior at the University of Vermont, studying Environmental Science with a concentration in Water Resources. His current career interests are focused around wetlands restoration and water chemistry. He recently spent two weeks studying water management and sustainable technology in the Netherlands and in the past has helped with biological and chemical stream monitoring with Raritan Headwaters Association.

Mentored by Senior Aquatics Scientist Dr. Jack Szczepanski, Will’s area of focus will be lake and pond management. He’ll spend most of his time in the field alongside members of the Aquatics Team collecting water quality data and mapping aquatic plants, learning about aquatic habitat creation, and implementing various invasive aquatic weed control efforts.

Learn more about Will.

 

Veronica Moditz, Water Resources Intern

We are thrilled to welcome back Veronica, who interned with us last year, and is in her final year at Stevens Institute of Technology, pursuing a Bachelor Degree in Environmental Engineering and a Master Degree in Sustainability Management. She is currently the secretary for Steven’s Environmental Engineering Professional Society chapter. In the future, she hopes to work on more sustainable approach to engineering problems.

Veronica will work alongside Project Engineer and Construction Specialist Amy McNamara, EIT, and Mary L. Paist-Goldman, P.E., Director of Engineering Services, on a variety of environmental engineering projects. Most recently, she assisted with a construction oversight and stormwater management project in Morris County, NJ.

Learn more about Veronica.

 

Tucker Simmons, Water Resources Engineer

Tucker is a Civil and Environmental Engineering major at Rowan University focusing on Water Resources Engineering. His Junior Clinic experience includes the study of Bio-Cemented sand and the Remote Sensing of Landfill Fires. In the future, Tucker hopes to work on creating a more sustainable environment.

Throughout his internship, Tucker will be mentored by Dr. Clay Emerson, P.E. CFM, Senior Water Resources Engineer, and will work on projects related to stormwater management, hydrologic and hydraulic analysis, and various aspects of environmental restoration. He recently assisted with a sink hole inspection in Tredyffrin Township, PA and mapped the water depths of a lake in Bucks County, PA.

Learn more about Tucker.

 

Stay tuned for updates on what our interns are working on!

 

 

 

New York Hosts Harmful Algal Blooms Summit

Photo: Veronica Volk, Great Lakes Today

Photo credit: Veronica Volk, Great Lakes Today

The Western New York Harmful Algal Blooms (HABs) Summit, the last of four Statewide HABs summits, was held last month in Rochester, NY. The summits kicked off Governor Cuomo’s $65 million initiative to protect the NY State’s lakes, ponds and reservoirs, and those that rely on these waterbodies for recreation and drinking water, from the ecological and health impacts associated with HABs.

“Protecting New York’s natural resources is key to ensuring residents have access to safe water, and through this collaborative summit, we are addressing the growing threat of harmful algal blooms,” said Governor Cuomo in a recent press release.

Tim Schneider, Owasco Lake Watershed Inspection Program

Photo: Tim Schneider, Owasco Lake Watershed Inspection Program

Each regional summit involved a day-long session of expert presentations and panel discussions on a variety of HAB related topics, and culminated in an evening session, which was open to the public and provided community members an opportunity to learn more about the Governor’s initiative and pose questions to NYSDEC about HABs and the management of HABs. The evening sessions were available to view via a live online stream as well.

For each summit, the Governor invited regional experts to participate along with NYSDEC and Department of Health experts. The experts were brought together to initiate the development of tailored HAB action plans. Although the focus was placed on the management of Governor Cuomo’s 12 priority waterbodies, the goal was to identify HAB management plans applicable for all of the State’s waterbodies, large or small. The discussions that evolved through the four summits set the stage to inform decisions related to preventing and properly responding to HABs across the state.

Participating by the invitation of Governor Cuomo and the NYSDEC in last month’s Western New York Summit were:

  • Dr. Steve Souza, Princeton Hydro
  • Art DeGaetano, Cornell University
  • Christopher Gobler, SUNY Stony Brook
  • Dave Matthews, Upstate Freshwater Institute
  • Greg Boyer, SUNY ESF
  • Nelson Hairston, Cornell University
  • Sally Flis, The Fertilizer Institute
  • Tim Davis, Bowling Greene State University, Ohio

During the Western New York Summit, Dr. Souza, Princeton Hydro co-founder, provided insight on the causes of HABs and, in particular, discussed the management techniques that have been successfully implemented by Princeton Hydro to combat the onset and mitigate the impacts of HABs.

About Governor Cuomo’s Harmful Algal Blooms program:
Governor Cuomo’s program builds on New York’s $2.5 billion Clean Water Infrastructure Act investments in clean water infrastructure and water quality protection. The Harmful Algal Blooms initiative is supported with funds from both the Clean Water Infrastructure Act and the $300 million Environmental Protection Fund. Through the Governor’s leadership, New York has developed the most comprehensive HABs outreach and monitoring programs in the country, led by DEC sampling of ambient waters across the state and DOH sampling at regulated beaches and public water systems.

UPCOMING EVENTS: SPRING UPDATE FROM PRINCETON HYDRO

Throughout April and May, Princeton Hydro is participating in a variety of events focused on conserving, restoring, and protecting our precious water resources.

April 11: New Jersey Invasive Species Strike Team 10th Annual Conference

Presented by the Friends of Hopewell Valley Open Space, the 10th Annual New Jersey Invasive Species Strike Team Conference is considered the most comprehensive state-wide forum on invasive species. The conference brings participants together to collaborate and address new and emerging invasive species issues from a state-wide perspective, and includes an exhibitor hall, networking opportunities and a variety of presentations and panel discussions on topics ranging from “Rare Bird Conservation” to “Foraging for Invasive Species” to “Herbicide Application Techniques.”

Princeton Hydro, a proud sponsor of the conference, will be exhibiting. We hope to see you there!

View the full conference schedule.

 

April 14: Musconetcong River Watershed Cleanup

As part of the 26th Annual Musconetcong River Cleanup on April 14th from 9 AM – 12 PM, Princeton Hydro will be leading a volunteer team at the Warren Glen Dam site. Friends and family welcome to join us!

For details, visit the Musconetcong Watershed Association’s event page.

 

April 18: The New England Chapter of the American Public Works Association Spring Conference

The New England Chapter of the American Public Works Association (NEAPWA) serves professionals in all aspects of public works and supports the people, agencies, and organizations that plan, build, maintain, and improve communities.

This year’s NEAPWA Spring Conference is being held at the Pratt & Whitney Stadium in East Hartford, CT. The conference includes a tour of the stadium, an exhibitor hall, educational session, and technical workshops on topics, like “Water System Infrastructure Planning in Response to Drought Conditions,” “Leveraging GIS Technology with Municipal LED Street Lights,” and “Using Infiltration and Inflow to Work Smarter not Harder.”

View the full conference agenda.

 

April 26: Arbor Day Planting and Bird Walk at Exton Park

We’re celebrating Arbor Day on April 26th (one day early) with Friends of Exton Park. First, we’ll be on the lookout for spring migrants during a morning bird walk (8:30 AM – 10:30 AM). Then, we’ll show our Arbor Day spirit by planting a variety of native plants at Exton Park (11:00 AM). We hope you’ll join us!

Click here to RSVP.

 

 

May 4: New York State Federation of Lake Associations Annual Conference

The New York State Federation of Lake Associations will host its 35th Annual Conference at the Fort William Henry Conference Center in Lake George, NY.  This year’s conference, which is titled, “Protecting Our Lakes for 35 Years – Our Past, Present and Future,” will feature a diverse exhibitor hall, networking opportunities, a silent auction and a variety of educational sessions. Princeton Hydro is exhibiting and giving five presentations:

  • Nutrient Inactivation: A Pennsylvania Case Study
  • You Have Your Lake Data, Now What? Creating a Watershed Plan
  • One Watershed, Many Lakes: A Strategic Plan for the Kettle Lakes of Southern Onondaga and Northern Cortland Counties
  • Proactive Management of Harmful Algal Blooms
  • Hydrilla Control in Harveys Lake, PA

Read more.

2018 NYSFOLA Annual Conference

The New York State Federation of Lake Associations (NYSFOLA) will host its 35th Annual Conference May 4-5 at the Fort William Henry Conference Center in Lake George.

This year’s conference, which is titled, “Protecting Our Lakes for 35 Years – Our Past, Present and Future,” will feature a diverse exhibitor hall, networking opportunities, a silent auction and a variety of educational sessions. Princeton Hydro is exhibiting and giving five presentations:

  • Nutrient Inactivation: A Pennsylvania Case Study by Dr. Fred Lubnow, Director of Aquatic Programs
  • You Have Your Lake Data, Now What? Creating a Watershed Plan by Chris Mikolajczyk, Senior Aquatic Scientist
  • One Watershed, Many Lakes: A Strategic Plan for the Kettle Lakes of Southern Onondaga and Northern Cortland Counties by Michael Hartshorne, Senior Limnologist
  • Proactive Management of Harmful Algal Blooms by Dr. Stephen Souza, Founder
  • Hydrilla Control in Harveys Lake, PA by Dr. Fred Lubnow

Environmental professionals, students, recreation enthusiasts, lakeside residents and community members are all invited to come together to explore a variety of topics related to managing and protecting watersheds. Additional educational session topics include, Citizen Science Water Quality Monitoring, Managing Water Chestnut and Other Invasives, Severe Weather Events Emergency Preparedness, and much more. Click here to view the complete agenda.

If you’re attending the conference, be sure to visit the Princeton Hydro booth to discuss the latest advancements in pond, lake and watershed management. If you’re interested in participating, you can register here. Registration closes on April 27th.

Stay tuned for a conference recap and photos!

ABOUT NYSFOLA
NYSFOLA was founded in 1983 by a coalition of lake associations concerned about water quality, invasive species, and other issues facing New York’s lakes. Today, more than 200 lake associations across the state are members of the only statewide voice for lakes and lake associations. NYSFOLA also has corporate members and individual members who support our efforts.

Understanding and Addressing Invasive Species

Photo from: New York State Department of Environmental Conservation, water chestnut bed at Beacon

Spring is officially here! Tulips will soon be emerging from the ground, buds blossoming on trees and, unfortunately, invasive plant species will begin their annual growing cycle. No type of habitat or region of the globe is immune to the threat of invasive species (“invasives”). Invasives create major impacts on ecosystems throughout the world, and freshwater ecosystems and estuaries are especially vulnerable because the establishment of such species in these habitats is difficult to contain and reverse.

This blog provides an introduction to invasive aquatic species, including information that will help you prevent the spread of invasives in the waterways of your community.

Defining Invasive Species

Invasive species can be defined as non-native occurring in an ecosystem that is outside its actual natural or native distributional range. Although the colonization of an ecosystem by non-native species can occur naturally, it is more often a function of human intervention, both deliberate and accidental. For aquatic ecosystems some species have become established as a result of the aquarium trade, fish culture practices and/or transport of plants and animals in the bilge and ballast water of trans-oceanic shipping vessels.

One of the primary reasons invasives are able to thrive, spread rapidly, and outcompete native species is that the environmental checks and predators that control these species in their natural settings are lacking in the ecosystems and habitat in which they become introduced. The subsequent damages they cause occur on many ecological levels including competition for food or habitat (feeding, refuge and/or spawning), direct predation and consumption of native species, introduction of disease or parasites, and other forms of disruption that lead to the replacement of the native species with the invasive species. As a result, invasives very often cause serious harm to the environment, the economy, and even human health. A prominent example is the Emerald Ash Borer, a non-native, invasive beetle that is responsible for the widespread death of ash trees.

As noted above, there are a large number of aquatic invasive species. Some of the more commonly occurring non-native aquatic plant species that impact East Coast lakes, ponds and reservoirs include:

Understanding How Invasives Spread

Either intentionally or unintentionally, people have helped spread invasives around the globe. This is not a recent phenomenon but rather something that has been occurring for centuries. “Intentional introductions,” the deliberate transfer of nuisance species into a new environment, can involve a person pouring their home aquarium into a lake or deliberate actions intended to improve the conditions for various human activities, for example, in agriculture, or to achieve aesthetics not naturally available.

Photo by: Tom Britt/CC Flickr, zebra Mussels adhered to a boat propeller“Unintentional introductions” involve the accidental transfer of invasives, which can happen in many ways, including aquatic species attached to the hull of boats or contained in bilge and ballast water. A high-profile example is the introduction of zebra mussels to North America. Native to Central Asia and parts of Europe, zebra mussels accidentally arrived in the Great Lakes and Hudson River via cargo ships traveling between the regions. The occurrence, density, and distribution of Zebra mussels occurred at an alarming rate, with the species spreading to 20 states in the United States and to Ontario and Quebec in Canada. Due to their reproductive fecundity and filter-feeding ability, they are considered the most devastating aquatic invasive species to invade North American fresh waters. They alter and diminish the plankton communities of the lakes that they colonize leading to a number of cascading trophic impacts that have especially negative consequences on fisheries. Zebra mussel infestations have also been linked to increased cyanobacteria (bluegreen algae) blooms and the occurrence of harmful algae blooms (HABs) that impact drinking water quality, recreational use, and the health of humans, pets, and livestock.

Additionally, higher than average temperatures and changes in rain and snow patterns caused by climate change further enable some invasive plant species to move into new areas. This is exemplified by the increased northly spread of hydrilla (Hydrilla verticillate), a tropical invasive plant species that has migrated since its introduction in Florida in the 1950s to lakes, rivers, and reservoirs throughout the U.S.

Regardless of how any of these invasive species first became established, the thousands of terrestrial and aquatic invasive species introduced into the U.S. have caused major ecological, recreational and economic impacts.

Measuring the Impacts of Invasives

After habitat loss, invasive, non-native species are the second largest threat to biodiversity. According to The Nature Conservancy, “Invasive species have contributed directly to the decline of 42% of the threatened and endangered species in the United States. The annual cost to the nation’s economy is estimated at $120 billion a year, with over 100 million acres (an area roughly the size of California) suffering from invasive plant infestations. Invasive species are a global problem — with the annual cost of impacts and control efforts equaling 5% of the world’s economy.”

Of the $120 billion, about $100 million per year is spent on aquatic invasive plant control to address such deleterious issues as:

  • Human health (West Nile Virus, Zika Virus)
  • Water quality impacts (Canada geese)
  • Potable water supplies (Zebra mussel)
  • Commercial fisheries (Snake head, lamprey, Eurasian ruffe, round goby)
  • Recreational activities (Eurasian watermilfoil, water chestnut, hydrilla)
  • Biodiversity (Purple loosestrife, common reed, Japanese knotweed)

Invasive species can change the food web in an ecosystem by destroying or replacing native food sources. As the National Wildlife Federation explains, “The invasive species may provide little to no food value for native wildlife. Invasive species can also alter the abundance or diversity of species that are important habitat for native wildlife. Additionally, some invasive species are capable of changing the conditions in an ecosystem, such as changing soil chemistry…”

Addressing Invasives

Our native biodiversity is an irreplaceable and valuable treasure. Through a combination of prevention, early detection, eradication, restoration, research and outreach, we can help protect our native heritage from damage by invasive species.

What Can We Do?

  • Reduce the spread
  • Routinely monitor
  • Document and report
  • Spread the word

Reducing the Spread:
The best way to fight invasive species is to prevent them from occurring in the first place. There are a variety of simple things each of us can do to help stop the introduction and spread of invasives.

  • Plant native plants on your property and remove any invasive plants. Before you plant anything, verify with your local nursery and check out this online resource for help in identifying invasive plants.
  • Thoroughly wash your gear and watercraft before and after your trip. Invasives come in many forms – plants, fungi and animals – and even those of microscopic size can cause major damage.
  • Don’t release aquarium fish and plants, live bait or other exotic animals into the wild. If you plan to own an exotic pet, do your research to make sure you can commit to looking after it. Look into alternatives to live bait.

Monitoring:
The Lake Hopatcong Foundation Water Chestnut prevention brochureInvasive plant monitoring is one of the most valuable site­-level activities people can support. Contact your local watershed organizations to inquire about watershed monitoring volunteer opportunities. For example, the Lake Hopatcong “Water Scouts” program was established to seek out and remove any instances of the invasive water chestnut species.

If you are a lake or watershed manager, the best way to begin an invasive plant monitoring project is with an expert invasive plant survey to determine which invasives are most likely to be problematic in your watershed and identify the watershed’s most vulnerable areas. Contact us to learn more.

 

Documenting and Reporting:
It’s important to learn to identify invasive species in your area and report any sightings to your county extension agent or local land manager. For example, in New Jersey there is the Invasive Species Strike Team that tracks the spread of terrestrial and aquatic invasives and works with local communities in the management of these species. Additionally, consider developing a stewardship plan for your community to help preserve its natural resources. Princeton Hydro’s team of natural resource scientists can help you get the ball rolling by preparing stewardship plans focused on controlling invasive species and protecting the long-term health of open spaces, forests habitats, wetlands, and water-quality in your community.

Spreading the word:
Many people still don’t understand the serious implications of invasive species. Education is a crucial step in stopping the spread of invasives, which is why it’s so important to talk with your neighbors, friends and family about the hazards and ecological/economic impacts of invasive species.

Also consider talking with your community lake or watershed manager about hosting an educational workshop where experts can share their knowledge about invasives specific to your area and how best to address them. Princeton Hydro’s Director of Aquatic Programs Dr. Fred Lubnow recently gave a presentation to the Lake Hopatcong Foundation titled, “Invasive Species in Watershed Management.” View it here.

 

We encourage you to share this article and spread your invasive species knowledge so that together we can help stop the introduction and spread of invasive species.

AQUATIC ORGANISM PASSAGE: A PRINCETON HYDRO BLOG SERIES

Welcome to the second installment of Princeton Hydro’s multi-part blog series about aquatic organism passage.

What you’ll learn:

  • How does promoting aquatic organism passage benefit ecosystems as a whole?
  • How can others, including people, benefit from aquatic organism passage?
  • How has Princeton Hydro supported it?

Photo by Princeton Hydro Founder Steve Souza

Fostering Ecological Balance in Food Webs

A major consequence of poorly designed culverts published in the NRCS' "Federal Stream Corridor Restoration Handbook"is the destabilization of food webs. Sufficient predators and prey must exist to maintain a balanced food web. For example, freshwater mussels (Unionidae) are a common snack among fish. A mussel’s life cycle involves using certain fish as a host for their larvae until these microscopic juveniles mature into their adult forms and drop off. During this period, the host fish will travel, effectively transporting a future food source with it.

In the presence of habitat fragmentation, the isolation of these symbiotic relationships can be devastating. Some mussel species rely on a small circle of fish species as their hosts, and conversely, some fish species rely on specific mussel species as their food. If a fish species is separated from its mussel partner, food shortages owing to a declining adult mussel population can occur.

Widespread Benefits to Flora, Fauna, and People

A shift in the 1980s recognized the importance of redesigning road-stream crossings for several reasons, including restoring aquatic organism passage and maintaining flood resiliency. Replacing culverts with larger structures that better facilitate the movement of both water and aquatic organisms benefit all species. Roads constructed over streams allow people to travel across natural landscapes while culverts that are fish-friendly convey water at a rate similar to the surrounding landscape, reducing scour in stream beds.

A man fly fishes as his dog sits by his side at Ken Lockwood Gorge, Hunterdon County. Photo from State of New Jersey website.

Fish, as well as semi-terrestrial organisms like crabs and salamanders, can take advantage of more natural stream environments and complete their migrations. Anglers appreciate healthy, plentiful fish populations nearly as much as the fish themselves. Recreation and economic growth also improve when streams regain the aquatic biological communities once lost through habitat fragmentation. According to USFWS, for every dollar spent on restoration through the Partners for Fish and Wildlife Program and Coastal Program Restoration Project, states gain $1.90 of economic activity. Stream restoration improves fish and wildlife habitat, which directly supports and enhances recreation opportunities for outdoor enthusiasts thus resulting in increased tourism-related spending and job growth.

Aquatic Organism Passage in Action at Princeton Hydro

Princeton Hydro recently completed a project to facilitate aquatic organism passage for river herring in Red Brook in Plymouth, Massachusetts. Read all about it here!

For an introduction to aquatic organism passage, be sure to check out the first post in this multipart-series.

Sources:

“Aquatic Organism Passage through Bridges and Culverts.” Flow. Vermont Department of Environmental Conservation’s Watershed Management Division, 31 Jan. 2014. Web. 14 Mar. 2017.

Hoffman, R.L., Dunham, J.B., and Hansen, B.P., eds., 2012, Aquatic organism passage at road-stream crossings— Synthesis and guidelines for effectiveness monitoring: U.S. Geological Survey Open-File Report 2012-1090, 64 p.

Jackson, S., 2003. “Design and Construction of Aquatic Organism Passage at Road-Stream Crossings: Ecological Considerations in the Design of River and Stream Crossings.” 20-29 International Conference of Ecology and Transportation, Lake Placid, New York.

Kilgore, Roger T., Bergendahl, Bart S., and Hotchkiss, Rollin H. Publication No. FHWAHIF-11-008 HEC-26. Culvert Design for Aquatic Organism Passage Hydraulic Engineering Circular Number 26. October 2010.

Michigan Natural Features Inventory. Freshwater Mussels of Michigan. Michigan State University, 2005.

 

Princeton Hydro Founder Invited to Speak at EPA’s Harmful Algal Blooms Workshop

Princeton Hydro Founder Dr. Steve Souza was an invited speaker at the USEPA Region 2 Freshwater Harmful Algal Blooms (HABs) and Public Drinking Water Systems workshop last week in Manhattan. The objective of the workshop was to share information about the monitoring and assessment of freshwater HABs and the efforts to minimize their effect on public drinking water and the recreational uses of lakes.

Steve’s presentation focused on the proactive management of HABs, providing useful tips for and real-world examples of how to address HABs before they manifest, and, if a HAB does manifest, how to prevent it from further exacerbating water quality and cyanotoxin problems.

The workshop was well attended with 80 people on site and 40 others participating via webinar link. Steve was joined by nine other invited speakers, most of whom were representing the USEPA, NYSDEC and NJDEP, who gave presentations on a variety of HABs related topics, including the optimization of water treatment operations to minimize cyanotoxin risks surveillance and assessment of HABs, and communicating HABs risks in recreational lakes and drinking water reservoirs.

If you’re interested in learning more about HABs, you can view a complete copy of Steve’s presentation, titled Proactive Management of Harmful Algae Blooms in Drinking Water and Recreational Waterbodies, by clicking the image below. Please contact us anytime to discuss how Princeton Hydro’s Invasive Weed and Algae Management Services can be of service to you.

The USEPA Region 2 serves New Jersey, New York, Puerto Rico, the U.S. Virgin Islands, and eight tribal nations. Get more info on key issues and initiatives in USEPA Region 2.

 

 

Aquatic Organism Passage: A Princeton Hydro Blog Series

Introducing part one of a multi-part blog series about aquatic organism passage
What you’ll learn:
  • What is aquatic organism passage?
  • Why is it important?
  • How does Princeton Hydro support it?

This photo from NYS DEC demonstrates a well-designed stream crossing.

Since the US government began allotting funds for building roads in U.S. national forests in the late 1920s, hundreds of thousands of culverts were built across the country. Culverts, or drainage structures that convey water underneath a barrier such as a road or railroad, were originally built with the intention of moving water quickly and efficiently. While this goal was met, many migratory fish and other aquatic organisms could not overcome the culverts’ high-velocity flows, sending them away from their migratory destinations. If the culvert was perched, or elevated above the water surface, it would require the migratory aquatic animals to both leap upwards and fight the unnaturally fast stream current to continue their journeys. Additionally, turbulence, low flows, and debris challenged the movement of aquatic organisms.

Thus, the goal of aquatic organism passage (AOP) is to maintain connectivity by allowing aquatic organisms to migrate upstream or downstream under roads. AOP “has a profound influence on the movement, distribution and abundance of populations of aquatic species in rivers and streams”. These aforementioned species include “fish, aquatic reptiles and amphibians, and the insects that live in the stream bed and are the food source for fish”.

This photo from NYS DEC demonstrates a poorly-designed stream crossing.

A poorly designed culvert can harm fish populations in multiple ways. If sturgeon aren’t able to surpass it, habitat fragmentation prevails. And so, a once-connected habitat for thousands of sturgeon breaks into isolated areas where a few hundred now live. When the population was in the thousands, a disease that wiped out 80% of the population would still leave a viable number of individuals left to survive and mate; a population of a few hundred will be severely hurt by such an event. In sum, habitat fragmentation raises the risk of local extinction (extirpation) as well as extinction in general.

The splintering of a large population into several smaller ones can also leave species more vulnerable to invasive species. Generally, the greater the biodiversity harbored in a population, the stronger its response will be against a disturbance. A dwindling community of a few hundred herring will likely succumb to an invasive who preys on it while a larger, more robust community of a few thousand herring has a greater chance of containing some individuals who can outcompete the invasive.

Aquatic Organism Passage in Action at Princeton Hydro

Princeton Hydro recently teamed up with Trout Unlimited to reconnect streams within a prized central-Pennsylvanian trout fishery.  Our team enabled aquatic organism passage by replacing two culverts in Pennsylvania’s Cross Fork Creek. Read about it here!

Sources:

“Aquatic Organism Passage through Bridges and Culverts.” Flow. Vermont Department of Environmental Conservation’s Watershed Management Division, 31 Jan. 2014. Web. 14 Mar. 2017.

Hoffman, R.L., Dunham, J.B., and Hansen, B.P., eds., 2012, Aquatic organism passage at road-stream crossings— Synthesis and guidelines for effectiveness monitoring: US Geological Survey Open-File Report 2012-1090, 64p.

Jackson, S., 2003. “Design and Construction of Aquatic Organism Passage at Road-Stream Crossings: Ecological Considerations in the Design of River and Stream Crossings.” 20-29 International Conference of Ecology and Transportation, Lake Placid, New York.

Kilgore, Roger T., Bergendahl, Bart S., and Hotchkiss, Rollin H. Publication No. FHWAHIF-11-008 HEC-26. Culvert Design for Aquatic Organism Passage Hydraulic Engineering Circular Number 26. October 2010.

American Littoral Society and Princeton Hydro Receive “Project of the Year” Award

The American Littoral Society and Princeton Hydro accepted the “Project of the Year” Award at last night's The American Society of Civil Engineers Central New Jersey Branch Annual Dinner. The team received the award for their work on the Barnegat Bay Green Infrastructure Project. Photo from left to right: Tim Dillingham, American Littoral Society Executive Director; Helen Henderson American Littoral Society Ocean Planning Manager for the Mid-Atlantic region; Dr. Stephen J. Souza, Princeton Hydro Founder.

The American Littoral Society and Princeton Hydro accepted the “Project of the Year” Award at the American Society of Civil Engineers (ASCE) Annual Dinner. The team received the award for their work on the Barnegat Bay Green Infrastructure Project.

”This was a terrific project conducted for a terrific client – the American Littoral Society,” said Princeton Hydro Founder Dr. Stephen Souza. “It also would not have been possible without a very supportive and engaged stakeholder group.”

The Barnegat Bay Project focused on reducing the amount of pollution entering the Bay’s waterways by retrofitting outdated stormwater management systems and implementing green infrastructure on previously developed sites.

“The project showcases the combined skill-sets of Princeton Hydro,” said Dr. Souza. “This was a truly collaborative effort involving the company’s aquatic ecologists, wetland ecologists, water resource engineers and landscape architect. We all worked closely to develop and implement green infrastructure solutions that measurably decrease pollutant loading to Barnegat Bay and correct localized flooding problems.”

Learn more about the award-winning project here: https://goo.gl/uQ3DfV. Big congratulations to the entire Littoral Society team for winning this prestigious award! And, many thanks to ASCE Central Jersey Branch for the recognition.

Princeton Hydro Projects Recap

In Case You Missed It:
A Recap of Projects Recently Completed by the
Princeton Hydro Aquatic & Engineering Departments

Members of our New England Regional Office team conducted a detailed survey at a culvert prioritized for replacement in the Town of Stony Point, New York. This structure was one of several identified as important to both habitat and flood risk during the development of Stony Point’s Road-Stream Crossing Management Plan. The Princeton Hydro team will use the collected data to develop a conceptual design and implementation strategy for a replacement structure using the Stream Simulation design method developed by the U.S. Forest Service.

Special thanks to Paul Woodworth, Fluvial Geomorphologist, and Sophie Breitbart, Staff Scientist, for their excellent work on this project!

The Truxor was put to work dredging a pond in Union Gap, New Jersey. The Truxor is an extremely versatile amphibious machine that can perform a variety of functions, including weed cutting and harvesting, mat algae and debris removal, silt pumping, channel excavation, oil spill clean-up, and much more!

We recently designed and installed a solar-powered aeration system in Hillsborough, New Jersey. Solar pond and lake aeration systems are cost-effective, eco-friendly, sustainable, and they eliminate the need to run direct-wired electrical lines to remote locations. Princeton Hydro designs, installs and maintains various aeration and sub-surface destratification systems for public drinking water purveyors, municipal and county parks, private and public golf courses, and large lake communities throughout the East Coast.

Here’s a look at a project in Elizabeth, New Jersey to clear the area of phragmites. Phragmites is an invasive weed that forms dense thickets of vegetation unsuitable for native fauna. It also outcompetes native vegetation and lowers local plant diversity. Previously, the entire site was filled with phragmites. Late last year, we utilized the Marsh Master to remove the invasive weed. Now that its almost Spring, we’re back at the site using the Marsh Master to mill and cultivate the ground in preparation for re-planting native plant species. A big shout out to our Aquatic Specialist John Eberly for his great work on this project!

In this photo, our intern and engineering student currently studying at Stevens Institute of Technology, Veronica Moditz, is gathering data on the Hughesville Dam removal. She’s using GPS to check the elevation of the constructed riffle on the beautiful Musconetcong River.

Members of the Princeton Hydro team worked in South New Jersey doing annual maintenance on nine stormwater infiltration basins that were also designed and constructed by Princeton Hydro. The maintenance work involves clearing vegetation from the basins to ensure the organic matter does not impede infiltration of the water as per the basins’ design. This project also involves the management of invasive plant species within the basins. Stormwater infiltration basins provide numerous benefits including preventing flooding and downstream erosion, improving water quality in adjacent waterbodies, reducing the volume of stormwater runoff, and increasing ground water recharge.

We recently completed a project in New Jersey for which we used our Truxor machine to dredge a stormwater retention basin. The basin had accumulated large amounts of sediment which were impeding the flow of water into the basin. We equipped the Truxor with its standard bucket attachment and a hydraulic dredge pump. The dredging operation was a success and now the basin is clear and functioning properly.

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