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Zone AO Zone AO is the flood insurance rate ZOne that corresponds to the areas of lOa-year flooding (usually sheet flow On sloping terrain) where average depths are between 1 and 3 feet. Average wholefoot depths derived from the detailed hydraulic analyses are shown within this zOne. Zone X Zone X is the flood insurance rate zone that corresponds to areas outside the SOO-year floodplain, areas within the SOO-year floodplain, areas of laO-year flooding where average depths are less than 1 foot, areas of lOO-year flooding where the contributing drainage area is less than 1 square mile, and areas protected from the lOa-year flood by levees. No base flood elevations or depths are shown within this zone. Zone D Zone D is the flood insurance rate unstudied areas where flood hazards are zOne that corresponds to undetermined, but possible. 6.0 FLOOD INSURANCE RATE MAP The Flood Insurance Rate Map (FIRM) is designed for flood insurance and floodplain management applications. For flood insurance applications, the map designates flood insurance rate zones as described in Section S.O and, in the lOa-year floodplains that were studied by detai led methods, shows selected wholefoot base flood elevations (BFEs) or average depths. Insurance agents use the zones and BFEs in conjunction with information on structures and their contents to assign premium rates for flood insurance policies. For floodplain management applications, the map shows by tints, screens, and symbols, the 100- and SOO-year floodplains, the floodways, and the locations of selected cross sections used in the hydraulic analyses and floodway computations. 7.0 OTHER STUDIES . The reaches of East Toll Gate Creek from Chambers Road to 1,300 feet upstream and from South Buckley Road to 0.8 mile upstream were analyzed by Merrick and Company and Greiner Engineering Sciences, Inc., respectively (References 18 and 19, respectively). The revised hydraulic analyses for West Toll Gate Creek from Mississippi Avenue to approximately 800 feet upstream of Mexico Avenue, and the portion of West Toll Gage Creek from South Buckley Road upstream to East Hampden Avenue were performed by the City of Aurora Engineering Division (References 21 and 22). The analyses for the portion of West Toll Gate Creek between East Hampden and East Quincy Avenues was performed by 67