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<br />feet; depths are shown, but no Flood <br />Hazard Factors are determined. <br /> <br />Zone A3: <br /> <br />Special Flood Hazard Areas inundated <br />by the laO-year flood, determined by <br />detailed methods; base flood elevations <br />shown, and zones subdivided according <br />to Flood Hazard Factors. <br /> <br />Zone 13: <br /> <br />Areas between the Special Flood Hazard <br />Areas and the limits of the SOQ-year <br />flood, including areas of the 500-yea,r <br />flood plain that are protected frem the <br />laO-year flood by dike, levee, or other <br />water control structure; also areas <br />subject to certain types of laO-year <br />shallow flooding where depths are less <br />than 1.0 foot; and areas subject to <br />lOO-year flooding from sources with <br />drainage areas less than 1 square mile. <br />Zone B is not subdivided. <br /> <br />Zone C: <br /> <br />Areas of minimal flooding. <br /> <br />The flood elevation differences, Flood Hazard Factors, flood insur- <br />ance zones, and base flood elevations for each flooding source <br />studied in detail in the community are summarized in Table 3. <br /> <br />5.4 Flood Insurance Rate Map Description <br /> <br />The Flood Insurance Rate Map for the Town of Firestone is, for <br />insurance purposes, the principal result of the Flood Insurance <br />Study. This map (publiShed separately) contains the official delin- <br />eation of flood insurance zones and base flood elevation lines. <br />Base flood elevation lines show the locations of the expected whole- <br />foot water-surface elevations of the base (IOO-year) flood. This <br />map is developed in accordance with the latest flood insurance <br />ma~ preparation guidelines published by the Federal Insurance <br />Admin i s t.ra tion ~ <br /> <br />6.0 OTHER STUDIES <br /> <br />A drainage study was made for the Town of Firestone (Reference 11) which <br />includes flood discharges and proposed improvements. These discharges, <br />developed by using the Colorado ~rban Hydrography Procedure (CUHP), are <br />wi thin -r.oleran,:..;e with those computed for this study. Because of diffi- <br />cult.y in using t.he CUHP in undeveloped agricultural watersheds, the <br />discharges determined in this report are considered appropriate. The <br />discharges reported here also include the effect of failure of the levee <br />in the Town of Frederick. In other respects, the drainage report agrees <br />with this Flood Insurance Study. <br /> <br />10 <br />