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environmental | Brighton In-Stream Water Quality Restoration
Brighton In-Stream Water Quality Restoration, Gaithersburg, MD
The Brighton SWM Facility was constructed in 1972 as an in-stream stormwater management facility, and included three 42" RCP pipes control base flows and small storm events with an 80 foot long concrete weir structure to control the 2 and most of the 5 year storm events. A 100 foot wide emergency spillway allowed for larger storm events to overflow. The SWM facility, located within the Muddy Branch Watershed, adjoins a stream classified as USE I.
AMT's services included design for reconstruction and vertical and horizontal extension of the existing concrete weir/stormwater management facility to provide additional water quality and downstream stream protection. Existing WSSC 24" force main and 21" gravity sewer systems were coordinated with WSSC and incorporated into the design to provide protection during construction.
Triple culverts, which provide passage of the discharges through a pathway, were removed and replaced with a Con Span arch to reduce impacts from point velocities from the culverts. This will also include a plunge pool to help reduce velocities prior to reentering the natural stream. Minor stream erosion areas are being stabilized utilizing imbricated riprap or rock protection and additional water quality is being provided by diverting first flush discharges from the stream, into the existing wooded area via sheet flow.
Included permitting through the Maryland Department of the Environment Dam Safety; MDNR and COE for non tidal wetlands; Montgomery County Soil Conservation District (SCD) for Stormwater Management, the City of Gaithersburg for Erosion Sediment Control; and for Natural Resource Inventory/Forest Stand Delineation (NRI/FSD).
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