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Downtown Overlay District (DOD), Water Quality Master Plan and Regional Water Quality Pond Design
The City of Georgetown developed a downtown master plan to provide a comprehensive development strategy for the central part of the City. The master plan boundary followed that of the Downtown Overlay District (DOD). The DOD, comprised of approximately 110 acres, consisted of varied land uses including commercial, institutional, and residential. As part of the downtown master plan and to provide a more holistic approach toward re-development within the DOD, the City investigated a “regional” approach to providing storm water quality management. Utilizing such an approach eliminated the need for individual water quality ponds on each re-developing parcel, allowing more flexibility in design and providing a more aesthetically pleasing framework for this historic area of the city.
Identified as public land (approx 16 acres) within the West Bouldin Creek watershed, Doucet provided water quality, erosion control, and low storm intensity flood control to the creek and riparian corridor. The Best Management Practices (BMP) consisted of a channel runoff diversion structure, a sedimentation/extended detention pond, and a downstream level spreader with a ½-acre vegetative filter strip prior to discharging flow back into West Bouldin Creek
Working with the Parks and Recreation Department, Doucet provided engineering services for a previous landfill site bounded by Town Lake to the north, Mopac Expressway to the east, Stratford Drive to the south, and Eanes Creek to the west. Doucet performed the following: Hydrologic & Hydraulic Analysis for the contributing drainage area upstream of the project site Channel Improvements Design to convey runoff using 6” Conlock with vegetation infill and covered with biodegradable soil retention blankets Liner System Design using Geomembrane EPDM Rubber Liner for the new channel Bank Stabilization development using vegetated reinforced soils, vegetation planting, soil retention blanket, rock riprap, limestone blocks and AKWARDRAIN for Eanes Creek.
