C-36 Channel Conveyance Improvements Along South Mayde Creek Upstream of Greenhouse Road

C-36 Channel Conveyance Improvements Along South Mayde Creek Upstream of Greenhouse Road
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Recent Actions

January 4, 2022  - Harris County Commissioners Court authorized the acquisition of four tracts of land in support of this project.

February 9, 2021 - Harris County Commissioners accepted the Preliminary Engineering Report and authorized the Flood Control District to proceed with design and construction of this project.

January 28, 2020 - Harris County Commissioners Court approved an additional $172,420 for engineering services in support of this project

October 9, 2018 – Harris County Commissioners Court authorized the County Judge to execute an agreement with the U.S. Army Corps of Engineers to allow the Flood Control District access to Addicks Reservoir property in support of this project 

March 27, 2018 - Harris County Commissioners Court approved a $495,000 agreement for engineering services in support of this project.

PROJECT DESCRIPTION 

The Harris County Flood Control District completed preliminary engineering on a project to improve the flow of stormwater and reduce flooding risks along lower South Mayde Creek, a tributary in the Addicks Reservoir watershed of northwest Harris County.

A Preliminary Engineering Report (PER) recommended details for channel improvements between Fry and Greenhouse roads, and will explored the possibility of a bypass channel to increase the discharge of stormwater into Addicks Reservoir. Preliminary engineering activities included collecting survey, geotechnical, and environmental field data, as well as coordinating with the U.S. Army Corps of Engineers, which owns, operates, and maintains the reservoir.

The channel conveyance improvements along South Mayde Creek could reduce the risk of flooding for over 70 structures and remove the 1% floodplain from an estimated 19 miles of roads near several schools.

The PER followed a feasibility study completed in 2017, which explored various ways to reduce the frequency of riverine flooding events along South Mayde Creek, as well as their depth and duration. The goal of the feasibility study was to achieve a level of protection equal to a storm that has a 1 percent chance of occurring each year (the “100-year flood”). The feasibility study recommended stormwater conveyance improvements for South Mayde Creek downstream of the Grand Parkway (State Highway 99) to Greenhouse Road, and construction of a bypass channel east of Greenhouse Road on the Addicks Reservoir. The feasibility study also considered the potential for future stormwater detention and retention, as well as property buyouts.

Preliminary Engineering Report Public Meeting - 03/21/18

Click this link to open the Report (PDF)

The creek, which flows into the Addicks Reservoir near Greenhouse Road, has a history of flooding in this area, with structures inundated during Hurricane Ike in 2008, a storm in April 2009, the Tax Day Flood of 2016, and Hurricane Harvey in 2017. The creek currently has a level of service that ranges from less than the 50% Annual Chance Event (2-year) rainfall event near the Addicks Reservoir to between the 1% Annual Chance Event (100-year) and .4% Annual Chance Event (250-year) rainfall event in the Morton Ranch area.

Location

The project is located along South Mayde Creek, a tributary in the Addicks Reservoir watershed of northwest Harris County, downstream of Grand Parkway (State Highway 99) between Fry Road and Greenhouse Road.

Stage

On February 9, 2021, a PER was presented to and approved by Harris County Commissioners Court. It includes an alternative for a proposed bypass channel to increase the discharge of stormwater into Addicks Reservoir. To date, the Flood Control District has not been able to secure partnership funding in order to proceed with design and phased construction of the bypass channel. While the bypass channel is being considered as a future effort, the focus of the next effort is the proposed channel conveyance improvements upstream of Greenhouse Road to Fry Road. The project is expected to officially enter the design stage in fall 2023.

Learn more about the stages of the Flood Control District project lifecycle.

Bond Project Listing

Bond Project C-36 is a potential "Partnership" project. Allocation for the design stage is currently $10 million on the 2018 Bond Program Project List, of which approximately nine million would be partnership funding, if granted, and one million would be local costs. This project is envisioned to receive funding from the Community Development Block Grant-Mitigation program (CDBG-MIT) but has yet to be determined.

Project Area Map – U101-00-00-E001

Project Lifecycle

Every flood damage reduction project is unique. Yet each project begins and ends, with common and predictable milestones along the way. Whether a project moves forward – and how quickly – depends on many factors, including the availability of funding at each milestone, shifting community priorities for flood damage reduction, and other changing circumstances (such as the price of trees or concrete) from year to year.

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