Z-02 Cloverleaf Area Drainage Improvements (N100-00-00-E001)

Z-02 Cloverleaf Area Drainage Improvements (N100-00-00-E001)
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Recent Action

November 9, 2021 – Harris County Commissioners Court has approved the acceptance of $10,000,000 in grant funds from the U.S. Department of Housing & Urban Development via the Texas General Land Office. There is a required local match of $5,132,952.

August 10, 2021 – Harris County Commissioners Court authorized a $1.84 million agreement to provide preliminary engineering, design, bidding and construction stage services in support of this project

Project Description

The Carpenters Bayou Watershed Planning Project, which was completed in 2021, investigated flooding problems and evaluated and recommended potential projects to reduce the risk of flooding in the watershed. The planning study was funded by the 2018 Bond Program, Bond ID F-124. The resulting Carpenters Bayou Watershed Plan made recommendations for major stormwater infrastructure improvements in the watershed.

In 2021, the Flood Control District was awarded $10 million in grant funding for construction of a flood risk reduction project in the Cloverleaf area of the watershed, as recommended in the Carpenters Bayou Watershed Plan. The grant comes from the U.S. Department of Housing and Urban Development (HUD) Community Development Block Grant-Mitigation program (CDBG-MIT) through the Texas General Land Office and Harris County Community Services Department.

The grant will fund the Cloverleaf Area Drainage Improvements Project (N100-00-00-E001), which will improve the internal drainage systems and related infrastructure that convey stormwater from the Cloverleaf subdivision to Carpenters Bayou. As part of the project, roadside drainage ditches in the neighborhood bounded by Alderson Street to the north, Hershe Street to the south, Hollywood Street to the west, and Sam Houston Tollway to the east, will be desilted, regraded and/or resized to increase stormwater carrying capacity and reduce street flooding in the area.

This project will consider several alternative solutions. One alternative may include the construction of an underground drainage culvert and stormwater detention basin in the area. The culvert would be designed to convey stormwater from the neighborhood drainage ditches to a nearby stormwater detention basin. If approved, the stormwater detention basin would temporarily store the stormwater from the Cloverleaf neighborhood until it could be slowly released into Carpenters Bayou. The specific locations of the potential underground culvert and stormwater detention basin have not yet been determined.

As of September 2021, this project is in the Preliminary Engineering stage. A community engagement meeting will be held to share the results of the Preliminary Engineering effort and the recommended project with the public. Updates on the progress of this drainage improvements project also will be posted to this webpage.

About Drainage Jurisdiction

The Flood Control District works with other agencies and shares jurisdiction over flooding issues in Harris County. Inside neighborhoods, internal drainage systems include underground storm sewer systems and roadside ditches, and are typically the responsibility of the underlying municipality, utility district and/or Harris County in unincorporated areas of the county.

The larger bayous and channels that take the collected stormwater and move it through the drainage system to Galveston Bay are the responsibility of the Flood Control District, and sometimes these drainage systems are constructed by the Flood Control District. In some instances, the Flood Control


The Harris County Flood Control District has a significant number of flood damage reduction projects occurring all over Harris County as part of its on-going Capital Improvement Program (CIP), Operations and Maintenance, and the 2018 Bond Program. Click the Project ID on the Map to learn about projects’ details. Some early-stage projects are not highlighted on the map. The map will be updated when projects advance or when more information becomes available.