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Over 100 linear feet of existing 36” diameter concrete wastewater line lost the cover and backfill due to scour and downcutting of Country Club Creek just upstream of Grove Boulevard. The line was downstream of the Austin Community College Riverside Campus and many apartment complexes. The exposed line was vulnerable to being deflected with opening pipe joints and wastewater spills if not stabilized. We designed a stabilized riffle downstream of the problem area to stable upstream environment for the new backfill around the exposed wastewater line. To stabilize the exposed wastewater line, an external gasket was used at each joint. The final design included normal bedding for the pipeline to the haunch, rock ballast to the top of the pipe and top it off with 12” diameter rock riprap.
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.
