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Engineering update: Friendswood outlines $10M+ funded terracing, 730-acre-foot detention project and master drainage plan
Summary
City engineering presented a quarterly drainage update covering a Clear Creek terracing project with $10M in state funding, a Bay Area regional flood-control project, and the Friendswood Regional Storm Water Detention Basin (about 730 acre-feet). Council asked for project metrics and promised public-engagement meetings.
Friendswood’s director of engineering, Hill Arias, briefed council on the city’s major stormwater projects and the near-finished master drainage plan intended to prioritize and sequence the city’s flood-mitigation investments.
Arias said the Clear Creek terracing project adjacent to City Center has secured about $10 million in state funds, has completed preliminary H&H analyses for alternatives, and will require design adjustments to avoid a cultural site discovered on the alignment. On the Friendswood Regional Storm Water Detention Basin (Vixie Farm Road), staff reported the project is about 90% designed and “is going to provide about 730 acre feet of detention,” and that final plans were targeted by the end of May.
Council members pressed for more detail on hydrologic-and-hydraulic metrics, how detention and conveyance interact, and how projects will be evaluated in the forthcoming citywide H&H model calibrated to Hurricane Harvey. Arias and staff said the master plan will present a prioritized list of ~15 projects and a benefit-cost framework; the plan will be presented to council in June and public engagement meetings will follow on affected projects.
Ending: Staff will publish technical reports and the master drainage plan for review; council asked staff to provide detailed H&H metrics (water-surface elevations and structures removed from floodplain) for projects as they move into permitting and public engagement.
