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Bull Creek Watershed Floodplain Modeling and Mapping
The Bull Creek Watershed, including West Bull Creek, is a suburban watershed with approximately 31.5 square miles of drainage area and 34.25 stream miles to be studied. The main purpose of this project was to develop digital geo-referenced hydrologic and hydraulic models and floodplain maps for the Bull and West Bull Creek watersheds for both existing and fully-developed land-use conditions. Our responsibility for this project involved developing hydraulic data and floodplain mapping for selected tributaries of Bull Creek. Doucet developed:
Fully-annotated HEC-RAS models with all supportive GIS files such as cross-sections and GIS geodatabase for both existing and fully-developed land-use conditions
Digital hydraulic data including tables, methodology descriptions and exhibits for Existing and Fully-Developed Land-use Conditions to incorporate into the Hydraulic Technical Support Data Notebooks (TSDN),
Water surface elevation profiles at similar vertical and horizontal scale as the profiles in the effective FIS report for selected FEMA flood frequencies using RAS-PLOT for the detailed study tributaries only,
Floodplain mapping
Digital copies of the floodplains and BFEs for the detailed study tributaries for both existing and fully-developed land-use conditions
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.
