Loop 88 Preliminary Drainage Report and Drainage Design

In 2018, Parkhill conducted a Preliminary Drainage Report for TxDOT to support the design of a new 12-mile outer loop freeway on Lubbock’s south side. The study involved analyzing 32 playas across 55 square miles of watershed. Parkhill investigated both adjacent and non-adjacent playas to understand overflow patterns and their potential impact on the proposed Loop 88, ensuring the design met both TxDOT and City of Lubbock Drainage Master Plan criteria. Due to complex overflow conditions, Parkhill employed a two-dimensional analysis using the ICPR hydrology program, preferred by the City of Lubbock, to calculate water storage elevations for various flood events. This detailed analysis provided data to guide future development regulations for the cities of Lubbock and Wolfforth. Upon completing the preliminary study, Parkhill transitioned to the PS&E design for the first 4 miles of Loop 88, including the Indiana intersection. Given the flat terrain and unique playa lake systems, hydrology and hydraulics (H&H) play a crucial role in determining roadway geometry. Parkhill’s drainage team works closely with the roadway design team in weekly meetings, continuously refining models to ensure optimal stormwater management and effective integration with the new loop’s design.