Project Name: Hemlock Farms Stormwater Retrofit
Summary: Green stormwater infrastructure design
Client: Hemlock Farms Community Association
Project Location: Municipalities of Porter, Blooming Grove, Dingman PA
Project Size: 75 miles of roadway, 4,600 acres, 3,600 lots
• Green Stormwater Management
• Flood Management
Project Timeframe: 2011 - Present
Relationship with Client: Since 2008
“I don’t think you could have done a better job on the stormwater design to date.” Robert Vandercar, Director of Public Works, Hemlock Farms Community Association
The Hemlock Farms Community is a 4,600 acre development that contains 3,600 lots, 75 miles of roadway, 100 acres of lakes, and no modern stormwater management. The development was designed in the 1960’s as a dense grid of ¾-acre lots. As the community approached build-out, major problems within the community developed including localized flood ing, poor water quality in the lakes, and erosion.
The community leaders chose Kleinschmidt to develop a Green Stormwater Infrastructure (GSI) solution to address these problems. This is one of the largest privately funded green stormwater retrofit projects in the US. GSI was designed to blend into the landscape and treat runoff along its entire flow path, with a primary focus on treatment at the source and the reduction of runoff volume through evapotranspiration and base flow enhancement. Non-structural and micro-scale structural GSI has been utilized to provide effective and efficient stormwater management. GSI has been creatively integrated into roadway shoulders, parking lot islands, and on infill lots. Kleinschmidt developed two GSIs especially for this project, retentive grading and step pools which greatly reduce tree removal, mimic forested floodplains, increase evapo-transpiration, enhance stream base flow, and reduce cost by utilizing geotextile tubes as berms.
Kleinschmidt integrated geographic information system (GIS) data with CADD Civil 3D and web viewing capabilities due to the size and scope of the project to enhance public outreach and increase project efficiencies. The GIS database has been designed to aid decision making during implementation of the project.