19E - FLOOD CONTROL UPDATE - Laserfiche WebLink

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MEMORANDUM David Cavazos, To: City Manager Date: Fred Mousavipour, From: Executive Director of Public Works January 8, 2016 Subject: FLOOD CONTROL SYSTEM MASTER PLAN — EXECUTIVE SUMMARY Current Status of Flood Control System The City's existing flood control system is significantly deficient. The system relies on a combination of surface roadway capacity and a limited network of catch basins and pipes. Our network does not extend into many of our watershed zones, or are under -sized in our arterial corridors; therefore we have many watershed areas that will flood upon moderate rain. As it stands today, rainfall with even less than 10 year storm intensity will result in flooding, particularly in arterial streets. While sporadic flooding is anticipated, a greater concern is that some arterial street segments could be inundated with up to 8 inches of running water or more resulting in safety and mobility impacts. Street closures would be affected to keep travelers away from flooded areas and to maintain safety, but pedestrians and bicycle users that turn to mass transit and private motor vehicles to navigate the city would be severely hampered by the closures. Recent Storm Drain Master Plan The City's Master Plan of Storm Drainage (MPD) was completed in 2015. MPD provides recommendations to alleviate flooding to protect life and prevent property loss. The improvements primarily consist of adding pipe to areas that do not have drain lines and increasing pipe sizes. Citywide storm drain runoff is routed into seven regional county channels: o Delhi 0 Gardens o Greenville Banning o Lane Barranca 0 Santa Ana 0 Santa Fe 0 Wintersburg In general, residential streets are the starting point for storm runoff, and capacities currently rely on roadway surface flows. Runoff from residential streets then collects at major arterials. 19E -3