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The original item was published from 5/5/2023 9:28:00 AM to 5/5/2023 9:31:55 AM.

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Project Management - Spotlights

Posted on: May 5, 2023

[ARCHIVED] GO Bond Prop A - Flood Protection and Drainage Update

Detention pond construction

GO Bond Prop A - Flood Protection and Drainage Update

This update for March highlights progress on the Proposition A Flood Protection and Drainage Improvements from the 2019 GO Bond. In May 2019 voters approved general obligation bonds allocating $73 million for 21 drainage projects. The bulk of the projects will provide drainage improvements in and around several League City subdivisions. 


Four projects have been completed which include the City Wide 2D Modeling, Bay Ridge Ph 3, Oaks of Clear Creek Overland Flow, and Bradshaw Ditch/Southeast Detention Pond. Overall, the status of the program is as follows:


  4   Complete

  4   Currently under construction

12   Currently under design

             1   Scheduled for purchase in 2023



Bay Colony Area Detention Ponds


This project constructs drainage improvements to 18 existing detention ponds to reduce flooding in the Bay Colony area subdivisions.  Detention areas are to be widened at the top, leaving the bottom one third of the detention area unchanged. This approach allows for approximately 70 ac-ft of additional detention storage. 


Grading improvements to over 90% of the ponds has been completed, including at Bay Colony Town Center, Bay Colony Parkside Community, Bay Colony Meadows East Detention Pond, Bay Colony Pointe Subdivision and Lakes of Bay Colony. The contractor is currently working on the ponds at Meadows of Bay Colony. All ponds are anticipated to be completed by the end of May 2023. 


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Bay Ridge Phase 2 Pump Station


Phase 2 is the third of four planned projects impacting the Gum Bayou Watershed and the Bay Ridge Subdivision to enter construction. These drainage projects will help with street ponding and reduce the flooding potential during major rainfall events. This project adds capacity to the current detention pond by deepening it and adds a dedicated pump station to pump storm water out of the pond and into Gum Bayou after a major rainfall event. Subdivisions/areas affected include Bay Ridge Area, Hidden Lakes, Whispering Lakes, and Lakes of South Shore. 


Pond excavation will be ongoing for the next several months. Construction of the Pump station building pad started in January. In late February an older existing sanitary sewer line was found to conflict with the pump building pad and discharge piping. The conflict will be resolved via rerouting the sewer line around the building improvements. This work should begin the second week of May and be completed by the end of the month. Construction of the foundation and walls for the pump station is complete. The contractor began forming and pouring the pilot channels. Construction is currently scheduled to complete in November 2023 but is highly weather dependent since construction takes place in a pond.