Town Ditch is being regraded and reseeded from Old Alvin Rd. to Pearland Pkwy. as part of the continued effort to improve drainage in the area.
This detention facility is designed as a regional mitigation basin strictly for the benefit of the watershed with no availability to be sold or allocated for public of private projects as part of a joint project with the City of Pearland. This area was identified in the Master Drainage Plan and the specific property was found to be available during the design process of the McHard Rd. Extension project. It is approximately 35 acres and the volume will be maximized to provide ultimate benefits to the surrounding community.
The Mimosa Acres/Willowcrest Detention Facility will expand the currently constructed detention pond on the eastern portion of the property and connect it to the proposed detention pond on the western portion. The ponds will utilize a pumped system to fully maximize the capacity and will provide additional flood mitigation for the surrounding neighborhoods of Mimosa Acres and Willowcrest.
This project is part of the Texas Water Development Board grant program 75/25 local match agreement. The District was awarded the grant to enclose the ditch with reinforced concrete boxes and to construct mitigation ponds associated with the project. The goal of these improvements is to provide flood relief to the surrounding area and localized flooding which includes the neighborhoods of Willowcrest and Willowick.
The ponds will be located at the BDD4 offices property on either sides of the back parking lot and shop.
West Pond construction starting soon.
The District has identified the need for improvements to the weir structures at the Bailey Detention Pond (south of Bailey; west of Wells Dr.) and the Cowart Diversion Detention Pond (between Veterans Dr. and Wells Dr.).
A drainage study of the Hood Ditch area was completed in August 2017 which identified several projects that would reduce flooding along Hood Ditch. The improvements at the Diversion Pond were included in this study and was used as a guide to scope this project.
The proposed optimization of the existing weir to Bailey Pond has also been identified by observations during rain events and the LOMR for Coward Creek Diversion improvements. These improvements will provide efficient use of the available volume in both ponds and will reduce the flooding risk to residents along the north/south streets between Bailey and CR 100.
The West Lea Drainage Improvements project will be a multi-phased project that will incorporate improvements to the interior of the West Lea subdivision drainage system, the drainage ditch that conveys storm water from the subdivision, and Mary’s Creek which is the receiving stream.
Mary’s Creek will be reconstructed to install in-line storage through benching sections on the north bank of the channel. The extents of the channel benching will start from the weir at the West Mary’s Detention Basin to the channel crossing at Magnolia Pkwy. A total of approximately 3,800 linear feet of benching will be constructed with stop blocks placed at an interval of approximately 500 feet in order to keep the channel conveyance similar to the existing condition, thereby creating additional storage in the floodplain with the benched sections.
The Mary’s Creek benching project will coincide with the rehabilitation of the West Lea Ditch and drainage improvements within the West Lea subdivision. These improvements will not alter the runoff volume from the West Lea subdivision, only the timing of inflow into Mary’s Creek, reducing the contribution of runoff to Mary’s Creek during peak times. The benching section on Mary’s Creek will provide additional capacity without impacting the 100-year storm frequency.
Installation of Drainage Improvements
The Clear Creek Federal Flood Damage Reduction Project is a partnership project between the U.S. Army Corps of Engineers, the Harris County Flood Control District, Galveston County, and Brazoria Drainage District No. 4. As of the June 2019 Project Partnership Agreement between the Corps and the Harris County Flood Control District, the Flood Control District is the lead agency for this project, under a non-federal implementation pilot program authorized by Section 1043(b) of the Water Resources Reform and Development Act (WRRDA) of 2014.
The portion of this project within the limits of Brazoria Drainage District No. 4 is Clear Creek between SH 288 and Dixie Farm Road and Mary’s Creek from Harkey Road to SH 35.
For more information please click on the following links:
Brazoria Drainage District No. 4’s Board of Commissioners has adopted the updated Hazard Mitigation Plan at the January 7, 2020 board meeting.
The updated plan can be downloaded at the following link:
Harris County Flood Warning System
In 2018 Brazoria Drainage District No. 4, through the use of a Memorandum of Understanding (MOU) with the City of Pearland and an Inter-local agreement with the Harris County Flood Control District, installed 8 new rain/storm gauges throughout the district (map of gauge locations).
The purpose of this project was to remove the old gauges that the City of Pearland owned and replace them with the newest technology in order to give residents within our jurisdiction real-time monitoring of our local streams and bayous. The data includes water levels, rainfall amount, historical flooding data, a visual cross-section of the associated drainage channel, and our benchmark information at each gauge station.
When it begins to rain, data-collecting sensors at each gauge station transmit rainfall amounts via radio frequency every time 0.04 inches of rain is measured by the sensor. Sensors that transmit bayou/stream levels report every 0.10 foot rise in water levels. The sensors transmit information to four primary repeaters located in the Huffman, Clodine, League City, and Tomball areas.The repeaters then relay the data to primary and back-up base stations located at Houston Transtar and at the Harris County Appraisal District. The information is monitored daily by software and by Flood Control District staff to ensure the gauges are properly functioning and transmitting accurate data.
Update: We have are in the process of adding 8 new locations around our District. Check out the latest map and get live updates via text or email at the Harris County Flood Warning System site:
The Brazoria County Stormwater Quality Coalition consists of the City of Lake Jackson, City of Freeport, City of Clute, City of Alvin, City of Richwood, City of Angleton, Brazoria County C & R District No. 3, Brazoria Drainage District No. 4, Angleton Drainage District, Velasco Drainage District, and Brazoria County. The coalition was formed in August 2007 as an effort by the members to assist one another in complying with stormwater quality regulations established by the Texas Commission on Environmental Quality.
Help us improve water quality in Brazoria County. Please report the following to the stormwater pollution hotline:
- Illicit discharges
- Non-compliant construction sites
- Illegal dumping
- Other stormwater quality concerns
Stormwater Pollution Hotlines: