Stormwater drainage analysis of Marsha Sharp Freeway and University Avenue

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2016-11-28

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Abstract

One recent transportation infrastructure update in Lubbock, Texas, is the Marsha Sharp Freeway (MSF) portion of the US 62/82 Highway, which will eventually extend from Interstate 27 to 3.6 miles west of West Loop 289. The portion of the freeway that crosses through the Texas Tech University (TTU) campus was completed in 2009, and much of that section was constructed well below previous ground surface elevation. The sag point of the Freeway below University Avenue flooded several times since September 2014 during intense rainfall events, sometimes coupled with backflow through the MSF storm inlets. The Lubbock District of the Texas Department of Transportation (TxDOT) engaged our team to [1] review previous hydrologic and hydraulic efforts, [2] update the current description of the local watershed and storm sewer conditions, [3] compare the 50‐yr design event to the recent intense rainfall events, [4] confirm operation of the pumped drainage system for the TTU football stadium, [5] assemble a hydrologic and hydraulic model for the system, and [6] propose potential alternative solutions. We developed a SWMM model and found that the storm sewer system performed as intended in the original TxDOT design. The recent storm events had typical annual exceedance probabilities of 2 to over 20 percent. In the last 20 years, development on the TTU campus greatly increased the runoff from about 200 contributing acres, with more significant impact than the football stadium drainage system. Several alternative strategies were simulated to demonstrate their effects on the amount and timing of runoff flows.

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Marsha Sharp Freeway

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