Bandera: City to Close on $8.2M Transaction for Flooding Drainage Improvements
Feature Photo: The city of Bandera is planning flood control improvements upstream of the dam on the Medina River by City Park. Image: Google Streets.
by Adolfo Pesquera
Bandera (Bandera County) — The city of Bandera is preparing to close on an $8,233,288 funding transaction for the planning, design and construction of flooding drainage improvements.
The Texas Water Development Board on Wednesday approved by resolution the city’s application for financial assistance. The funds are coming from two sources–a $4,528,000 loan from the TWDB and a $3,705,288 grant from the Flood Infrastructure Fund.
The city has in recent years experienced flood events resulting in numerous parts of town being routinely damaged, even during small flood events. For this reason, the city conducted preliminary hydrologic and hydraulic studies using site investigations and the best available data.
Light Detection and Ranging (Lidar) data was used to delineate drainage areas and determine the amount of runoff water in each project area. The studies found that the existing drainage system was significantly undersized and rainfall events with a two-year return frequency or greater could create flooding conditions, confirming damages due to high-velocity water runoff and high-water surface elevations.
This lack of drainage infrastructure, has created a safety concern for residents and emergency personnel. Additionally, high-velocity water runoffs have damaged the city’s streets and parks.
The proposed project is intended to mitigate damages and city maintenance activities. The proposed project components were identified based on the lack of existing drainage infrastructure, low-water crossings that create a safety concerns, and damaging high-velocity stormwater runoff.
The project includes three drainage improvement components:
City-wide localized flooding drainage improvements, which consists of a variety of drainage strategies from channel regrading, road improvements, and box culvert installation, designed to effectively manage a 25-year storm event and reduce the effects a 100-year event.
Maple Street pavement and drainage improvements, which include installing a curb and gutter system along Maple Street with a buried stormwater system, will address high velocity runoff that scour and erode areas within the city park and causes damages to the pavement, and will decrease the flood risk in this area from a 2-year to a 10-year recurrence interval and mitigate erosion along the riverbanks and park.
Riparian Improvements and Erosion Control on the Medina River upstream of the dam along the city park, which includes delineating and creating specific recreation and parking areas, adding native vegetation (trees, shrubs, grasses and forbs), and addressing stormwater issues, to improve the area’s connection to the floodplain and the majority of the floodplain processes and ecological benefits.
The city of Bandera will close on the state loan June 1. The engineering feasibility report is due Aug. 31. The design phase should conclude by Dec. 31, 2021.
The project schedule calls for construction to begin by March 1, 2022 and for completion by March 31, 2023. The subtotal on the budget summary for construction costs is $6,900,388. The remaining funds are dedicated to engineering and special services, fiscal services and administration.
Adolfo Pesquera (Reporter/Editor) is a veteran news journalist. He has worked for Hearst Corp., American Lawyer Media, News Corp and Freedom Communications. His work has been published in newspapers and magazines across the USA. He is a journalism graduate of UT-RGV. He writes, edits and creates digital pages for VBX.