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Consultants present HUC‑10 regional drainage study; consultants and city map $1.5B program of projects to reduce flood risk
Summary
Civil Systems Engineering presented a regional HUC‑10 watershed study to Harlingen commissioners, outlining 39 subbasins, monitoring upgrades and a toolbox of drainage measures (channel improvements, detention basins, reused resacas) and estimating a program cost in the range of $1.5 billion while urging coordination with IBWC and neighboring counties.
Consultants from Civil Systems Engineering (CSC) gave Harlingen commissioners a detailed briefing on a regional HUC‑10 watershed flood‑planning study that covers roughly 287–297 square miles across parts of Willacy, Cameron and Hidalgo counties. The study uses HEC‑RAS/2D hydrologic modeling, recent LIDAR, NOAA rainfall records and observed storms (including major events in 2018, 2019 and March 2025) to map flood risk and prioritize projects.
CSC said the study divides the watershed into 39 subbasins to identify viable, bankable projects and to develop the benefit‑cost analyses required by the Texas Water Development Board (TWDB). The consultants described a “toolbox” of measures — channel…
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