WBCM provided environmental water resources services for the design and construction of the Goshen Branch stream restoration and wetland mitigation. The stream restoration and wetland mitigation were part of the compensatory efforts related to the construction of the MD 200, the Intercounty Connector (ICC).
WBCM designed 16 acres of wetland creation and 5,000 feet of stream restoration that improved the water quality in the Seneca Creek Watershed. The design also created vernal pools, nine acres of riparian forested floodplain, nine acres of upland forest, and enhanced habitats along the stream corridor.
WBCM staff performed wetland delineations, functional assessments, forest stand delineations, stream gage monitoring, and geomorphic assessments and collected groundwater data over a two-year period to determine the appropriate wetland elevations. WBCM completed geomorphic analysis for 10,000 linear feet of stream, prepared wetland and stream assessment reports, and developed final wetland design parameters, including depth of cuts and seasonal water budgets, for each community type based on the original assessment data set.
WBCM developed the final channel design criteria and parameters, including proposed stream type, bankfull width and depth, entrenchment ratio, radius of curvature, and planform geometry based on an evaluation of reference reach or segment data. WBCM field verified the topographic survey and located and identified restoration areas and evaluated proposed layout options to select the geometry that best minimized cuts and fills and impacts to trees and jurisdictional resources. WBCM used TR-20, TR-55, and HEC-RAS to produce hydrologic and hydraulic analysis of the stream to verify stream stability and overbank flows.
WBCM created water budgets for the wetlands that included the reconnection volume from the hydrologic and hydraulic analysis. WBCM’s wetland design included enhancement to 1.5 acres of existing wetlands and additional habitat creation. The wetlands were designed using innovative micro-topography to create additional habitat, water-quality benefits, and additional roughness on the floodplain for overbank flows.
WBCM provided permitting services that included the preparation impact plates and calculations of impacts that were submitted to the ICC Corridor Partners for inclusion in the Joint Permit Application.
The project achieved functional uplift by providing water quality improvement, groundwater discharge/recharge, flood flow alteration, sediment retention, nutrient removal, wildlife habitat, and visual aesthetic improvements.
Maryland State Highway Administration
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Environmental Water Resources