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<br />Zone AE <br /> <br />Zone AE is the flood insurance rate zone that corresponds to the loo-year floodplains that are determined <br />in the Flood Insurance Study by detailed methods. Whole-foot BFEs derived from the detailed hydraulic <br />analyses are shown at selected intervals within this zone. <br /> <br />Zone X <br /> <br />Zone X is the flood insurance rate zone that corresponds to areas outside the 5oo-year floodplain, areas <br />witltin the 5oo-year floodplain, areas of lO<J-year flooding where average depths are less than I foot, areas <br />of lO<J-year flooding where the contributing drainage area is less than I square mile, and areas protected <br />from the Ioo-year flood by levees. No BFEs or depths are shown within this zone. <br /> <br />6.0 FLOOD INSURANCE RATE MAP <br /> <br />The Flood Insurance Rate Map is designed for flood insurance and floodplain management applications. <br /> <br />For flood insurance applications, the map designates flood insurance rate zones as described in Section <br />5.0 and, in the IO<J-year floodplains that were studied by detailed methods, shows selected whole-foot <br />BFEs or average depths. Insurance agents use the zones and BFEs in conjunction with information on <br />structures and their contents to assign premium rates for flood insurance policies. <br /> <br />For floodplain management applications, the map shows by tints, screens, and symbols, the 100- and <br />500 -year floodplains, floodways, and the locations of selected cross sections used in the hydraulic <br />analyses and floodway computations. <br /> <br />7.0 OTHER STUDIES <br /> <br />A floodplain delineation study conducted by Hydro-Triad, Ltd., for the Ptarmigan Project provides an <br />estimation for the loo-year peak discharge for the Blue River downstream from Dillon Dam (Reference <br />16). However, the study, "Hydrology Report, Blue river Downstream of Dillon Reservoir, Summit <br />county, Colorado (Reference 8), provides updated discharges based on detailed hydrologic analysis. The <br />discharges for the Blue River developed for that report are used in the original and the restudy. <br /> <br />A Flood Insurance Study was previously prepared (Reference 1). A restudy for the unincorporated areas <br />of Summit county, Colorado (Reference 17), was prepared concurrently with this restudy. The studies <br />are in agreement. <br /> <br />This report either supersedes or is compatible with all previous studies published on streams studied in <br />this report and should be considered authoritative for the purposes of the NFIP. <br /> <br />8.0 LOCATION OF DATA <br /> <br />Information concerning the pertinent data used in the preparation of this study can be obtained by <br />contacting FEMA, Mitigation Division, Denver Federal Center, Building 710, Box 25267, Denver, <br />Colorado 80225-0267. <br /> <br />11 <br />