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The original item was published from 6/24/2021 8:42:02 AM to 6/24/2021 8:49:22 AM.

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Posted on: June 24, 2021

[ARCHIVED] Results of Lower Clear Creek and Dickinson Bayou Watershed Study

Clear Creek and Dickinson Bayou Study

On Tuesday, June 22, League City Councilmembers and City Staff attended a workshop to learn more about the findings and recommendations of an 18-month study of the Clear Creek and Dickinson Bayou Watersheds.

To view a video of the presentation visit http://leaguecitytx.swagit.com/play/06222021-1175

To view a pdf of the presentation visit /DocumentCenter/View/28248

The regional study, which began in late 2019, was conducted by consulting firm Freese and Nichols and was led by the City of League City and five additional key planning partners, including the U.S. Army Corps of Engineers (USACE), City of Friendswood, Harris County Flood Control District (HCFCD), Galveston County, and the Galveston County Consolidated Drainage District.

Chuck Wolf, an associate with consulting firm Freese and Nichols, spoke before Council during the workshop. In its study, Freese and Nichols used modeling to determine that in a 100-year storm event, there would be about $500 million worth of damages in the Clear Creek Watershed and $800 million In the Dickinson Bayou Watershed.

The Dickinson Bayou Watershed has fewer structures as the watershed is less developed than the Clear Creek Watershed, but the structures mostly are together in a “bowl” that is prone to deep flooding, leading to more damages, Wolf said.

For solutions, Freese and Nichols propose doing detention and conveyance improvements in the Clear Creek Watershed along with building an underground tunnel starting at either FM 2351 or I-45. These solutions would reduce flooding around the creek anywhere from 1 inch to 5 feet, Wolf said.

In the Dickinson Bayou Watershed, Freese and Nichols officials concluded detention and channel improvements would reduce up to 3 feet of flooding in the bowl. However, over 1,800 structures would remain at risk of flooding during even a 10-year event, Wolf said.

“We can improve it, but we can’t fix it,” Wolf said of the bowl. “Topographically, it’s too low.”

Additionally, a large bypass channel to Galveston Bay would reduce flooding even more.

Wolf said some aspects of the study need to be studied further to refine the cost and impacts of proposed solutions. Additionally, officials need to assess how the coastal barrier proposed to be built between Galveston Island and Bolivar Peninsula would affect projects, he said.

Additionally, cities will need state and federal support to afford projects. Freese and Nichols and League City leaders have already met with some potential funding partners, such as Galveston County, Harris County Flood Control District, and the Army Corps of Engineers.

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