Protecting Natural and Biological Resources

The strategies we develop for our clients rely on the integration of our core competencies in FERC Hydro Permitting, fisheries biology, fisheries engineering, hydrology and hydraulic engineering, consulting, design, and research and development. Our engineers and scientists work closely together to ensure designs are biologically effective, feasible to construct, operate, and maintain, and are cost effective—all while meeting regulatory requirements and being mindful of location specific siting and cultural concerns. 

We take the time necessary to research the historical and current uses of your property to better understand known or potential impacts to environmental media including soil, groundwater, drinking water, surface water, sediments, and air. With this understanding, we can better help you understand the complexities of your project.

 


Our Services

ICON_ENVPL_BIOLO
Biological Resources

Providing healthy living landscapes that include botany, terrestrial, and aquatic wildlife.

ICON_ENVPL_CULTU
Cultural Resources

Helping clients navigate the regulatory framework required for responsible stewardship of cultural resources.

ICON_ENVPL_ECOLO
Ecology

Restoring wetlands, riparian, and aquatic systems in our coastal communities for a more sustainable and resilient future.

ICON_ENVPL_FISHPAS
Fish Passage Design, Modeling, & Testing

For both upstream and downstream passage for a multitude of species.

ICON_ENVPL_FISHPRT
Fish Protection Design, Modeling, & Testing

Research & Development, Evaluation, and Design of Fish Screening Facilities.

ICON_ENVPL_FISHTEST
Fish Testing

For Biological and Engineering Performance.

ICON_ENVPL_FISHENG
Fisheries Engineering

For licensing and project permitting requirements.

ICON_ENVPL_IMPACT
Impact Assessment, Planning & Permitting

Helping our clients implement a permitting strategy, including the development of schedules and mitigation plans to expedite permitting and compliance.

ICON_ENVPL_HYDROL
Water Quality & Hydrology

Supporting innovative solutions with numeric modeling expertise for hydrologic, water quality, and environmental monitoring and reporting.

ICON_ENVPL_MARINE
Water Quality & Hydrology (Marine)

Thoughtful and innovative planning to address the unique challenges associated with supplying water for beneficial use without adverse
impact to the environment or other legal water users.

ICON_ENVPL_WETLA
Wetlands

Expertise in habitat assessment and mapping, wetlands jurisdictional line delineations, threatened and endangered species, mitigation planning, and design.

Recent Projects

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The historic 325-acre Fort DuPont site will eventually include a new residential community, ships and an entertainment center while preserving many former military buildings that date back to the 19th century. The Fort DuPont Redevelopment and Preservation Corp. plans to recreate the base as a waterfront community where residents can live amid – and in some cases in – renovated military buildings, and enjoy the close proximity of the Delaware River and the Chesapeake & Delaware Canal. Verdantas' engineers and scientists are providing traffic engineering, civil engineering, geotechnical engineering, permitting and construction review and testing.

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Civil Infrastructure | Natural Resources & Environmental Planning
Fort DuPont

Civil, traffic, geotechnical engineering, permitting and construction review and testing for the historic 325-acre residential community.

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Through funding made available by the U.S. Department of Energy, Alden conducted a series of studies to evaluate and optimize the design and operation of two modular and scalable fish bypass systems developed specifically to provide safe downstream passage of silver American Eels at hydropower projects. The goal of the studies was to address the need for biologically effective and less expensive downstream fish passage technologies for silver eels. The studies were developed specifically for this fish species and life stage due to population declines in many areas of its range and the potential for mortality to occur if eels migrating to the marine environment to spawn are entrained through hydro turbines during their journey to the sea. The large size and unique behaviors of silver eels have made it difficult for dam owners to implement downstream passage measures that are both biologically and cost effective, resulting in a need for new innovative technologies.

The studies conducted by Alden included a laboratory evaluation of the biological performance of the two bypass systems, a field evaluation of biological performance conducted with full-scale bypass systems installed at the intake of a small hydro project in New Hampshire, CFD modeling of the laboratory flume and field evaluation site, and a desktop assessment of the potential for application of each technology at hydro projects within the known range of American Eel and the expected benefits (i.e., biological and economic). Few organizations have the capabilities to conduct this array of technical studies, but Alden’s scientists and engineers have been using various combinations of these approaches and methods to develop and evaluate state-of-the-art fish passage and protection systems for nearly 50 years.

Assistance with the performance and completion of these studies was provided by Lakeside Engineering (bypass design and installation) and Blue Leaf Environmental (DIDSON acoustic camera and 3D acoustic telemetry services).

 

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Natural Resources & Environmental Planning
Modular and Scalable Downstream Passage for Silver American Eel

Read how Alden tested the effects of innovative downstream fish passage technologies with lab, CFD, and field analysis. Funded by the Department of Energy

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A major component of an Atlantic salmon population model developed by NMFS is the survival of smolts and kelts passing downstream at hydropower projects.  To obtain this information, NMFS contracted Alden to estimate downstream passage survival of Atlantic salmon smolts and kelts at 15 hydroelectric projects on Maine’s Penobscot River and its tributaries.  These desktop survival estimates focus on direct mortality attributable to passage at dams and to multiple dam passage.  An established turbine blade strike probability and mortality model was used to estimate direct survival of fish passing through turbines at each project.  Survival rates for fish that pass downstream over spillways or through fish bypass facilities were estimated based on existing site-specific data or from studies conducted at other hydro projects with the same or similar species.  Most of the projects included in the study have upstream passage facilities for anadromous species (river herring, American shad, and/or Atlantic salmon), as well as operating downstream bypasses for juvenile and adult outmigrants.  Some of the projects have installed narrow-spaced bar racks or overlays to reduce fish entrainment through turbines.

The results of Alden’s survival analysis provided data in a level of detail that would have been extremely expensive and difficult to accomplish with field studies.  Typically, turbine passage survival studies conducted in the field only evaluate one or two turbines operating at one or two gate settings (i.e., flow rates). The methods and model developed for NMFS for Atlantic salmon on the Penobscot River are transferable to other river systems and species.  The theoretical model for predicting strike probability is applicable to most species and the blade strike mortality data for rainbow trout are considered representative of many other species. 

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Natural Resources & Environmental Planning
Using Turbine Survival Models and Existing Data to Understand the Impacts of Hydropower Projects on an Endangered Species

Using Turbine Survival Models and Existing Data to Understand the Impacts of Hydropower Projects on an Endangered Species

  • Since 2016, the Verdantas Team has consistently provided thorough, accurate, and timely plan reviews despite the pressures of fast-paced development in the community.

    Town Engineer Local Municipality, Delaware

  • Our municipality has utilized Verdantas as a consultant for capital projects involving the repair and replacement of its aging water and sewer infrastructure. They have provided initial engineering, design and construction management. The accuracy and thoroughness of their plans has resulted in capital projects that have consistently finished on time and within budget without unexpected change orders.

    Town Engineer Local Municipality, Delaware


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