19E - FLOOD CONTROL UPDATE - Laserfiche WebLink

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STORM DRAIN MASTER PLAN January 7, 2016 Page 2 The master plan provides two protection level goals: o Protection level in residential streets to prevent property damage due to flooding in a 100 year frequency storm. o Protection level in arterial streets to keep at least one lane of travel free of flooding in a 25 year frequency storm. Cost of Master Plan Improvements Full implementation of the MPD would not eliminate all deficiencies, and localized flooding would still occur. However, we will be updating the MPD study to incorporate the latest technological advances and infiltration devices (green technology) that would alleviate localized flooding at much lower costs and bring down the overall MPD costs. The total cost to make all MPD improvements to achieve our protection level goals is about $350 Million. By incorporating the latest technology, the total cost may be reduced to $300 Million. A more manageable implementation of the top 10 improvements which provide relief to the most flood prone watersheds is about $150 Million. Attached is a map showing the top 10 priority improvements and system build -out. Storm Drain System Improvements over the last 10 years The previous Master Plan of Storm Drainage (MPD) developed in the 1990's has proven to be a valuable resource since the city has been able to add flood protection infrastructure to our system as funding or project opportunities have materialized. Over the last 10 years, the City has added a small number of new storm drain lines and connector pipes, catch basin, and pervious concrete at various locations throughout the City. These projects were constructed primarily as part of street improvement projects. The following list summarizes the drainage system improvements added over the last ten years, providing a combined $5 million value: o Grand Avenue, First Street to Fourth Street - New Storm Drain o Third Street, Birch Street to Spurgeon Street - New Storm Drain o Various Storm Drain Upgrades - Pendleton /Forest, Birch Street Cul -de -sac, and Myrtle /Pacific o Center Street, Edinger Avenue to La Verne Avenue - New Storm Drain o Centennial Road, 1100' w/o Fairview - New Storm Drain o College Avenue, Martha Lane to Washington Avenue - New Storm Drain o Edinger, 700' w/o Fairview - New Storm Drain o Bristol Street, McFadden to Civic Center- New Storm Drain o Plaza of the Sun - New Storm Drains to eliminate the annual flooding in the Civic Center Plaza o Fourth Street, Minter to Garfield - Pervious concrete to promote infiltration and reduce flooding 19E -4