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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />i. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />!. <br />. <br />. <br />. <br />I. <br />, <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I. <br />. <br />. <br />. <br />. <br />. <br />,. <br />. <br />. <br /> <br />studies, an approximate 100-year flood elevation at a particular location on the river may be <br />obtained by using the lOG-year peak flow value (as provided in this report) in conjunction with <br />an acceptable hydraulic analysis, Hydraulic analyses fOT determining lOO-year water surface <br />elevations for approximate floodplains may be performed using FEMA's Quick-2 computer <br />program, the Corps of Engineers' HEC-2 computer program, F1owmaster, or other acceptable <br />hydraulic methods. Channel and floodplain cross-sections may be obtained from detailed <br />topographic mapping or from field surveys. Cross-sections obtained from USGS quadrangle <br />maps are not advised. <br /> <br />FloodDlain MaDDinl! <br />The existing FIRMs for Gunnison County and Incorporated Areas depict areas subject to 100- <br />year flooding based on approximate technical methods, The map does not show flood profiles, <br />base flood elevations, or sufficient detail in order for county and municipal officials, engineers, <br />developers, and land owners to make floodplain determinations with any certainty. The <br />Colorado Water Conservation Board can be contacted to request technical assistance for <br />approximate floodplain analyses as needed, <br /> <br />8 <br /> <br />- <br />