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<br />feet, the FHF is 050. <br />lOa-year water-surface <br />accuracy for the FHF is <br /> <br />When the difference between <br />elevations is greater than <br />to the nearest foot. <br /> <br />the 10- and <br />10.0 feet, <br /> <br />5.3 Flood Insurance Zones <br /> <br />After determining the reaches and their respective FHFs, the <br />entire incorporated area of Commerce City was divided into zones, <br />each having a specific flood potential or hazard. Each zone was <br />assigned one of the following flood insurance zone designations: <br /> <br />Zone B: <br /> <br />Special Flood Hazard Areas (SFHAs) <br />inundated by the lOa-year flood, <br />determined by detailed methods; <br />base flood elevations shown, and <br />zones subdivided according to <br />FHFs. <br /> <br />Areas between the SFHA and the <br />limits of the SOO-year flood, <br />including areas of the SOO-year <br />floodpbnnthatare protected from <br />the lOa-year flood by dike, levee, <br />or other water control structure; <br />or, areas subject to certain types <br />of lOa-year shallow flooding where <br />depths are less than 1.0 foot. <br />Zone B is not sub-divided. <br /> <br />Zones A6, A7, A9, Ala, <br />A12, Al3: <br /> <br />Zone C: <br /> <br />Areas of minimal flooding. <br /> <br />Table 3, "Flood Insurance Zone Data," summarizes <br />elevation differences, FHFs, flood insurance zones, <br />flood elevations for each flooding source studied in <br />the community. <br /> <br />the flood <br />and base <br />detail in <br /> <br />5.4 Flood Insurance Rate Map Description <br /> <br />The Flood Insurance Rate Map for the ci ty of Commerce City is, <br />for insurance purposes, the principal result of the Flood <br />Insurance Study. This map contains the official delineation of <br />flood insurance zones and base flood elevation lines. Base flood <br />elevation lines show the locations of the expected whole-foot <br />water-surface elevations of the base (lOa-year) flood. This map <br />is developed in accordance with the latest flood insurance map <br />preparation guidelines published by the Federal Insurance <br />Administration. <br /> <br />6.0 OTHER STUDIES <br /> <br />The present official floodplain study for the South Platte River is <br />the Denver Metropolitan Region Flood Plain Information Report, Volume <br />-I--C-R-e.-f--er--ence----8-)....,.--Which ~as aonpt-CtA by t-he ColnT"tH~n WatpT" r.nn~prv~r-in~_ <br />oar 10 w <br />experiences, as well as the construction of Chatfield Dam, the U.S. <br /> <br />18 <br />