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National Naval Medical Center Watershed/Water Quality Restoration, Bethesda, MD
A. Morton Thomas and Associates, Inc. developed a comprehensive plan to improve water quality, reduce stormwater surges, and create better aquatic and riparian habitat conditions for the Stoney Creek Watershed located on the grounds of the National Naval Medical Center (NNMC). The plan identifies existing problems, as well as, potential stormwater retrofit, stream restoration, wetland creation and reforestation opportunities. NNMC's goal is to redevelop Stoney Creek to a stable, healthy, pre-urbanized condition, to put NNMC in full compliance with the 1987 Clean Water Act Amendments (CWAA) Section 302 - water quality, and to plant native tree species that will help the Alliance for the Chesapeake Bay achieve their goals of conserving existing forests and installing riparian forest buffers for 2,010 miles by the year 2010.
Project components included:
- Development of a technical watershed management plan (including existing and future stormwater management systems) which address potential stream restoration, stormwater management, reforestation, improvements for fish habitat and wetland creation opportunities in the Stoney Creek Watershed. This task included site location, drawings of the proposed systems, a priority ranking system and detailed cost estimates for each project type.
- TR-20 Modeling for 2, 10 and 100-year storms.
- Development of objectives and criteria for prioritizing the stream channels for protection and restoration.
- Identified potential locations for stormwater management facilities.
- Application of Rapid Stream Assessment Technique (RSAT), Rosgen classification, Pfankuch survey, preliminary wetland identification, fish sampling, and other studies on biological conditions that helped to evaluate stream conditions for Stoney Creek.
- Evaluation of existing stormwater management system at NNMC, and development of a comprehensive evaluation of the function, type of pollutant(s) removed, required operation and maintenance (O&M) and recommended upgrades or improvements of these systems.
- Construction Documents were prepared for Bio-retention, surface sand filter, extended detention wetland marsh, pond dredging, and stream restoration designs.
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