The purpose of this project is to construct a stormwater detention basin on the main stem of Cypress Creek. Stormwater detention basins reduce flooding risks and damages during heavy rain events by safely storing excess stormwater and slowly releasing it back to the creek when the flooding has passed. A multi-phased engineering, design and construction approach is expected to begin in the Westador neighborhood. Tentatively, the Westador Stormwater Detention Basin will store approximately 1,100 acre-feet (more than 358 million gallons) of stormwater.
This is one of several stormwater detention projects the Flood Control District is developing in the Cypress Creek watershed. A regional drainage study for the watershed found that flooding along tributaries of Cypress Creek is predominately caused by stormwater from a rising Cypress Creek backing up into tributaries, rather than a lack of sufficient stormwater conveyance/drainage capacity on the tributaries themselves. Therefore, stormwater detention basins could be a beneficial project to reduce that backwater issue.
The regional drainage study described here recommends nearly 25,000 acre-feet of additional stormwater detention in the watershed.