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CENTER STREET AREA FRAMEWORK + POLICY PLAN <br /> Sto rmwate r Management System N'���i��'i o e cit Y ' l e m e n lits <br /> 4 <br /> 4 <br /> 1" Evient 1,00 5;'500 41J40 <br /> 1-'dear 2.46 14,700 10 , <br /> 2-Year 2 17,600 131, 4 <br /> 1 -Year <br /> Table 1: Summary of expected runoff volumes. <br /> Additional Considerations Since the reuse water will pass through a filter and <br /> A simplified estimate of stormwater runoff expected potentially other treatment methods,the impact <br /> from the street section was assembled to ensure the to groundwater resources through the infiltration <br /> watershed can produce enough runoff to adequately of irrigation water is expected to be very minimal. <br /> fill the tanks.Table 1 is a summary of expected runoff Impacts to groundwater resources in the ERA are <br /> volumes for a variety of events.A rainfall event producing <br /> between 3.6 and 4.3 inches in 24 hours (5-year to <br /> 10-year return interval) can completely fill the tank. <br /> During final design, additional hydraulic information will <br /> be provided to provide an effective high flow bypass <br /> system. In other words, if the tank is full and the City <br /> experiences a 100-year rainfall event,there will be <br /> adequate bypass capacity to reduce local flooding and <br /> protect the tank(s).Also, since the COR trunk storm <br /> sewer system is already designed to accommodate a <br /> 100-year rainfall event with discharge to regional flood <br /> storage areas,the bypass system will effectively mimic <br /> the originally designed scenario. In between events <br /> when irrigation is occurring, or the tanks is being filled, <br /> there will be hydraulic relief on the trunk system and <br /> volume control provided. <br /> 29 <br />