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insurance zones and base fl ood el evati ons 1 i nes. Base fl ood el eva- ti on 1 i nes show the 1 ocati ons of the expected whol e- foot wa ter- surface elevations of the base 1100-year) flood. This map is developed in accordance with the latest flood insurance map prepara- tion guidelines published by Federal Emergency Management Agency. 6.0 OTHER STUDIES I n April 1979, CWCB compl eted a fl ood study of the lower South Arkansa s River, Colorado (Reference 11. Infonnation of this study was made avail- abl e to the study contractor and the resul ts of thi s fl ood study are rea- sonable and, therefore, were adopted for this flood insurance study. Thi s study is authori ta tive for the purposes of the Na ti onal Flood I nsur- ance Program; data presented herein either supersede or are compatibl e with all previous determinations. 7.0 LOCATION OF DATA Survey, hydrologic, hydraulic, and other pertinent data used in this study can be obtained by contacting the office of the Federal Emergency Manage- ment Agency, Region VIII, Denver Federal Center, Building 710, Denver, Colorado 80225. 8.0 BIBLIOGRAPHY AND REFERENCES 1. Water Resources Consultants, Inc., prepared for Chaffee County and the Colorado Water Conservation Board, Floodplain Information Report Lower South Arkansas River, April 1979. 2. Colorado Planning Demographic Division, Colorado Population Report Series CP-26 #79(C-I), October, 1979. 3. Surface Water Supply of the United States, 1961-70, Part 7, Lower Mississippi River Basin, USGS Water Supply Papers 1921 and 2121. 4. Water Resource Data for Colorado, USGS, 1971-1978. 5. U.S. Army Corps of Engineers, Hydrologic Engineering Center, HEC-2 Water Surface Profile Program, 1979 version. 6. I-inch to 400 feet horizontal scale, 2-foot contour interval topo- graphic mapping, Delta Aerial Surveys, May 1978. 7. Flood Hazard Boundary Map, City of Salida, Colorado, May, 1974. 14