Hungerford-Stoneridge SWM Pond/Stream Improvements
Reference
Susan Straus 301-309-3220
Project Highlights
- Specifications for Extended Detention Wetland Basin
- Wetland Delineation
- Environmental Permitting
- Wetland Delineation
- Stream Assessment
Project Details
CRI conducted all environmental tasks associated with this stormwater retrofit and stream improvement project for Cabin John Creek in the City of Rockville. CRI delineated wetlands in the project area, prepared the joint permit application for wetland impacts needed to complete the project, and managed regulatory coordination with the Maryland Department of the Environment and U.S. Army Corps of Engineers to obtain the wetland and waterway permit.
CRI prepared the conceptual plans for an extended detention wetland marsh basin, as well as the detailed landscaping/pondscaping plans, planting specifications, and construction cost estimates.
The goal of the project was to slow erosion and enhance water quality in Cabin John Creek by constructing an extended detention wetland basin at the former Hungerford-Stoneridge swimming pool. The swimming pool and associated structures were demolished, and a 3-acre wetland basin was constructed to provide water quality treatment for the first one-half inch of runoff from a watershed that was developed before current stormwater regulations were in effect.
With the project engineer and City staff, CRI prepared conceptual plans to create an extended detention wetland marsh and identified areas along Cabin John Creek that needed restoration and stabilization. CRI provided design specifications to the project engineer for final basin elevations, which considered required detention volume, detention time, and flooding tolerance of wetland vegetation.
CRI also prepared final pondscaping plans that addressed neighborhood concerns, while maintaining the primary function for water quality treatment. We developed pondscaping plans and coordinated with City staff in developing planting specifications which provided a wide variety of submergent, emergent, and shrub wetland vegetation thereby enhancing wildlife habitat and aesthetics. CRI delineated existing boundaries in the project area and managed regulatory coordination to obtain federal and state wetland permits.