Recent Projects

On this page you will find recent projects that the UNH Stormwater Center has been involved in. They are searchable by title* or by the date in which the project was completed.

* For the Title field, you can enter a word or partial title listing or leave it blank and filter your search by Date only.

Restoring Water Quality in the Willow Brook Watershed Through LID Retrofits

Nov 2011

By Robert Roseen1, PhD, PE, D.WRE, James Houle1, CPSWQ, Robert Dowling1, Melodie Esterberg2, Director, Lorie Chase3, Sally Soule4

1UNH Stormwater Center, 2Rochester Department of Public Works, Cocheco River Watershed Coalition3, NHDES Grant Manager4

Willow Brook is a tributary to the Cocheco River in the urban center of Rochester, NH. This small urban stream is impaired for Primary and Secondary Contact Recreation (e. coli). Its direct receiving waters, the Cocheco River, are impaired for Aquatic Life Use (benthic macroinvertebrates and habitat) as well as Primary Contact Recreation (e.coli). Likely sources are nonpoint source pollutants from urban stormwater...

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Forging the Link: Linking the Economic Benefits of Low Impact Development and Community Decisions

Aug 2011

This project documents, through a series of case studies, the advantages of Low Impact Development (LID) in the economic terms of how municipal land use decisions are commonly made.

In addition to the environmental and water quality benefits
for which Low Impact Development (LID) is so commonly
known, considerable economic, infrastructure, and adaptation
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2011 Road Management Plan for Brackett and Pond Roads, Wakefield, NH

Jun 2011

The purpose of the Road Management Plan is to address the declining water quality of Lovell Lake caused by runoff from Brackett and Pond Roads carrying sediment and phosphorus. Unimproved roads are commonplace in the Lakes Region of New Hampshire in an area with a substantial seasonal population. Unimproved roads and associated maintenance are well documented as major sources of sediment and phosphorus to surface water and may account for as much as 80% of the sediment load and 40% of the phosphorus load within a watershed. Studies have shown that during highly erosive storm events, sediment concentrations may be observed to exceed 100,000 mg/L with averages for gravel roads >3,000 mg/l (Clinton and Vose 2003) whereas a typical low use paved road would be ~100 mg/L (Hagen and Walker...

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Greenland Meadows LID Case Study: Economics and Water Quality

Apr 2011

Greenland Meadows, New England Development, and the Conservation Law Foundation, Greenland, NH. (2005- Present)


Greenland Meadows is a retail shopping center built in 2008 by Newton, Mass.-based New England Development along Route 33 in Greenland, New Hampshire that features the largest porous asphalt and gravel wetland installation in the Northeast. The development is located on a 55.95-acre parcel and includes three, one-story retail buildings (Lowe’s Home Improvement, Target, and a supermarket), paved parking areas consisting of porous asphalt and non-porous pavements, landscaping areas, a large gravel wetland, as well as advanced stormwater management facilities. The total impervious area of the development – mainly from...

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Rhode Island Stormwater Design and Installation Standards Manual

Update of the Rhode Island Stormwater Design and Installation Standards Manual, by the Horsley Witten Group and the UNH Stormwater Center (2007-Present)

The Horsley Whitten Group, in cooperation with UNHSC, are now working with the CRMC and the Rhode Island Department of Environmental Protection (RIDEP) to develop the new state Stormwater Manual, for the state that includes updated specifications for the inclusion of LID regulatory guidelines. A draft of the manual is complete and available online at:

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Town of Newington Stormwater Site Plan Regulations

Update of Town of Newington Stormwater Site Plan Regulations (2009)

In early 2009 the UNHSC was contracted by the Piscataqua Region Estuaries Partnership to strengthen the town of Newington’s local regulations to incorporate up-to-date stormwater management controls. The goal of the project was to develop site plan regulations that provided the Planning Board with the regulatory tools needed to mitigate the impacts of stormwater runoff from impervious surfaces in Newington’s commercial and industrial zones and provide a framework to require Low Impact Development approaches that will directly benefit water quality in the Piscataqua River and the Great Bay estuary. The regulations addressed both new development and redevelopment of properties that require...

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Technical Training and Outreach Activities

A user-driven outreach strategy has helped keep UNHSC research sharp and provides a unique tool for identifying barriers to implementation of more effective management technologies.

Regular technology demonstration workshops are performed throughout the year. Over 1678 people have attended the 52 workshops over the past 5 years. Workshop participants are wide ranging and include towns, planning and conservation board members, consulting engineers, watershed alliances, state (MA, NH, VT, ME, CT, NY, NJ, RI) and federal DOT, state and federal environmental agencies (MA, NH, VT, ME, CT, NY, NJ, RI), and federal Coastal Training Programs (NEIWPCC, NHEP, MACZM). In 2007 UNHSC and instructional design experts from the Coastal Services Center (CSC) partnered to develop a targeted...

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LID in the Hodgson Brook Watershed

Introducing LID in the Hodgson Brook Watershed (2009-Present)

UNHSC is a project team member working with the Hodgson Brook Restoration Project and the City of Portsmouth, NH to design and oversee the installation of LID retrofits to treat non-point source pollution and improve water quality. Other project responsibilities include the development of model pollutant load and Effective Impervious Cover (EIC) reduction estimates within the watershed, identification of changes for city requirements necessary to facilitate the inclusion of LID stormwater management strategies, and outreach and education services to help build support for additional LID projects throughout the watershed.

To date three tree filters and a bioretention system...

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Consequences to Flooding along Lamprey River

Climate and Land Use Consequences to 100-Year Flooding along the Lamprey River (2009- Present)

In 2009 The Institute for the Study of Earth, Oceans and Space (EOS) at the University of New Hampshire received funding from CICEET to develop and refine a methodology for assessing flood risk associated with land use and climate change. UNHSC partnered with EOS, Great Bay NERR and Antioch University and evaluated change in the 100-year floodplain based on current and projected alterations in land use and climate for the 213 square mile Lamprey River watershed. The evaluation includes the use of Low Impact Development as an adaptation planning tool, and, in particular, as a means for building community resiliency in managing water resources. The analysis was...

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Development of hydrological mathematical models for LID-SWM systems

Development of hydrological mathematical models for LID-SWM systemsmn (2008 – Present)

Stormwater runoff is one of the primary stressors in coastal and freshwater systems. Because conventional stormwater management (SWM) cannot consistently meet the new standards for water quality, the focus in SWM shifted from solely hydrologic and hydraulic concerns with basically sedimentation and dilution of pollutants, to mass flux removal. The new approach, Low Impact Development - Stormwater Management (LID-SWM) has the potential to successfully address both quality and quantity aspects of stormwater runoff. As in any other field, planners, engineers, and legislators who develop SWM strategies need accurate tools based on sound scientific research in order to make...

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