This update for January 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.
Six projects have been completed which include the City Wide 2D Modeling, Bay Ridge Ph 3, Oaks of Clear Creek Overland Flow, Bradshaw Ditch/Southeast Detention Pond, Dove Meadows Detention Pond and Bay Colony Area Detention Ponds. Overall, the status of the program is as follows:
2 Currently under construction
1 Currently bidding
11 Currently under design
1 Scheduled for purchase in 2025
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.
The electricians are continuing with the installation of the conduit and pull wire. The generator was delivered on time in November and is operational. There is a change order pending which will be submitted to Council for approval to relocate the new electrical transformer connection. Due to reevaluation of the project site by the current area TNMP representative, it has been determined that the original location in the design plans has limited accessibility for future repairs and will need to be relocated. The change order will cover the contractor’s costs to run additional electrical conduit and wire as well as saw cut pavement and pour a new pad for the transformer. The transformer is slated to arrive in the Spring.
The Meadows Drainage Improvements, Phases I & II
The Meadows Drainage Project will address chronic flooding by providing clear, unobstructed drainage flow along drainage easements in the subdivision. The design includes adding overflow swales, deepening the existing channel, and upsizing the culvert at Smith Lane.
The construction contract was awarded via City Council action at the November 28, 2023 meeting. The pre-construction meeting occurred on January 25, 2024 and construction will commence by mid-February.
Bay Ridge Flood Reduction – Phase 1 Levee Improvements will elevate the front 400’ of Bay Ridge Drive, which was determined to be the main risk of flooding from external flood sources. Final design plans have been approved and signed by the city as of August 2023. Due to proximity with the TxDOT ROW a LOSA was required for construction and has been fully executed by the City and State. Plans have been submitted to TxDOT and receipt of the permit is pending.
The first bid advertisement is scheduled to be posted on January 9, 2024, and bids are to be opened on February 13, 2024. The construction contract award is anticipated to go before the Council in late March 2024.
Brief updates of some of the projects in design are below.
Phase 4 of the Bay Ridge Flood Reduction program focuses on Gum Bayou. Proposed culverts at the Columbia Memorial Parkway and League City Parkway were analyzed to determine the appropriate size to reduce ponding and the potential overflows. Hydrology and hydraulics (H&H) studies of Gum Bayou from League City Parkway (SH 96) to Dickinson Bayou were conducted in an effort to provide improvements to allow Bay Ridge Subdivision’s detention to drain. Existing Gum Bayou bridges were a part of the hydraulic analysis. This study helped evaluate the flow of water heading towards Dickinson Bayou in order to provide options for drainage improvements for the Gum Bayou Watershed. City staff is currently evaluating potential locations required to meet detention capacity necessary to implement the project. Once the location(s) have been nailed down a revised proposal will be requested from the consultant with a revised scope of work.
The Magnolia Creek & Cedar Gully Channel Improvements include modification of Magnolia Creek, Cedar Gully, and related tributaries to be regraded/sized to accommodate for Atlas 14. This is to ensure the drainage of Westover Park, Countryside, Magnolia Creek and Rustic Oaks subdivisions into the system is meeting design standards and does not result in structural flooding within the neighborhoods. Desnagging of the waterways will need to take place with this work. USACE permit comment response letter was submitted October 28, 2022. Additional correspondence was received from the USACE on May 16th with additional comments. The project team held a teleconference with USACE staff in June to discuss the project as a whole. Comments were addressed and submitted back to the USACE. In July 2023 the USACE issued another public notice for the project. Additional comments and correspondence from reviewing agencies were forwarded to the city and consultant in mid-August. These comments were addressed, and a response sent back to the USACE in September. The drawings are now under review which is anticipated to be completed by the first quarter of 2024.
Design plans and specifications are complete and ready for bid advertisement for the Countryside Subdivision Drainage Improvement. The city held a public meeting with homeowners in September 2022 and based on their recommendations, the City will reevaluate flooding observed and reported after Hurricane Harvey. The city will also clear out debris in the existing outfalls to Magnolia Creek. A meeting with Countryside South Community Association was held on March 8, 2023, to discuss the project scope and answer resident concerns. The project will be moving forward to bid in the next couple of months. Final scope will be dependent on the HOA and resident concurrence with the improvements as proposed.
The Benson Bayou Detention Project – Phase 1 will provide critical detention improvements within the watershed coupled with grade adjustments to the existing bayou in efforts to reduce water surface elevations to benefit the area while ensuring no adverse impact to downstream neighbors. In June 2022 an environmental investigation of a proposed pond site revealed a large number of forested wetlands within the proposed project area. The city directed the consultant to revise the project scope of work and design to remain within the approved budget for the project. The consultant delivered the revised schematic design on July 22, 2022, which included several alternative options to construct the detention basin within a smaller project footprint. City staff has requested that the consultant also explore the possibility of expanding an existing pond in the in the area and constructing a pump station. The report was received and was submitted to engineering for review. The City has reviewed and is determining whether the revised scope of the project is more cost effective, feasible, and within the approved budget.
The FM518 & Wesley Dr Drainage Improvements project focuses improvements on capturing and conveying the stormwater runoff that exceeds the current storm sewer system capacity at the intersection of FM 518 and Wesley Drive. The improvements will include upsizing and installing a new storm sewer system to convey stormwater to Corum Ditch. The project will incorporate current drainage and stormwater design standards. The Texas General Land Office (GLO) approved the AUGF (Authority to use Grant Funds) on February 21st. The LOSA (Local on System Agreement) has been submitted to TxDOT. TXDOT, recently confirmed that due to the cost of improvements in the ROW an Advance Funding Agreement (AFA) will be needed. Project Staff and TXDOT Rep, are currently working in conjunction to expedite the AFA. 100% plans were approved by the City on August 03, 2023. Utility relocation has been completed along the northern right-of-way of FM 518. Along the southern right-of-way, City staff met with Frontier to review potential conflicts. Coordination between Frontier and contractor will need to take place during construction of the storm sewer to ensure conflicts are resolved during intersection closure. Frontier is also working on drafting a relocation plan for project engineer to review and approve prior to construction activity. Construction is anticipated to start in early 2024.
The Oaks of Clear Creek North Detention Pond will reduce structural and street flooding in the Oaks of Clear Creek Subdivision in conjunction with the improvements from the Oaks of Clear Creek Detention and Deer Ridge Drive Overland Flow Projects. Purchase of land required for the drainage easement is in progress. The consultant is working on the environmental assessment (EA) and cultural resources study. GLO has reviewed and accepted the Environmental Assessment (EA) for Oaks of Clear Creek. The storm sewer route requires an easement along CenterPoint Energy right of way. They are currently reviewing the survey and design. The consultant is addressing the City’s 60% design comments. 90% plans are on hold due to CenterPoint conflicts. CenterPoint held an internal meeting to discuss options for the city to install approximately 3100 L.F. of 42 inch box culverts in their corridor. CenterPoint has approved access for installation in their ROW. The City is awaiting receipt of the letter stating approval of the design.
The Hughes Lane and W. Deats Rd Culvert Modification Project will increase capacity and efficiency of drainage flows through Borden’s Gully to I-45. Revised 30% design plans were received in October 2022 and design coordination between the City of League City and City of Dickinson design consultants progressed through April 2023. The City’s consultant was given authorization to proceed with 60% design in May 2023. A contract amendment for final design, bid and construction phase services was approved at the October 24th meeting. Additional scope is currently being reviewed for incorporation into the project. Pending that decision, the 90% plan submittal is expected in February 2024.