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<br />Hydrologic analyses for the Colorado River were carried out by the CWCB. <br />Flood frequency curves for the 10-, 50-, 100-, and 500-year recurrence intervals <br />were developed based on records from five u.s. Geological Survey (USGS) <br />stream-gaging stations from Dotsero to Cameo. Watec-surface profiles for the <br />Colorado River were calculated with the use of the USACE HEC-RAS <br />step-backwater program. (Reference 34) <br /> <br />Cross-section data for the Colorado River were developed from topographic maps <br />prepared by Analytical Surveys, Inc. (Reference 35). All bridges were field <br />surveyed to obtain elevation data and structural geometry. <br /> <br />1.3 Coordination <br /> <br />Streams requiring detailed and approximate study were identified at a meeting <br />attended by representatives of the Study Contractor (SC), FEMA, and <br />Garfield County in June 1982. <br /> <br />Results of the hydrologic analyses were coordinated with the USACE, the <br />CWCB, ARIX Consultants, Claycomb Engineering Associates, Inc., and the <br />USGS. <br /> <br />In January 1984, the results of the study were reviewed at an intermediate <br />coordination meeting attended by representatives of the SC, FEMA, and <br />Garfield County. <br /> <br />On January 31, 2005, FEMA notified the Town of Silt that a Physical Map <br />Revision was being prepared for the community using information prepared by <br />Schmueser Gordon Meyer, Inc. <br /> <br />2.0 AREA STUDIED <br /> <br />2.1 Scope _of Study <br /> <br />This FIS covers the unincorporated areas of Garfield County. The area of study is <br />shown on the Vicinity Map (Figure 1). <br /> <br />2 <br />