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I I I I I I I I I I I I I I I I I II I search included the review of the "Floodplain Information Report, Lower South Arkansas River" by Water Resource Consultants, 1979 (Reference 16). This report contains a hydrologic analysis of gage stations in the upper Arkansas River basin (mountain regions), in order to estimate the frequency-discharge relationship for the Lower South Arkansas River. These gages are presented in Table 2. The method applied in this study followed the procedures outlined in Reference 15, and the results were compared to historic flood records. The peak discharges for the 100-year event showed a close comparison to the historic peaks on the South Arkansas River. COM checked the hydrologic procedures by analyzing the records, supplementing the data with additional records, and recomputed a regional discharge-area relationship. The results of COM's regional gage analysis of mountain region streams in the Upper Arkansas River Basin, are in Figure 8. It was therefore recommended that the peak discharges derived for Reference 16 be used in the hydraulic analysis of the South Arkansas River in Salida (refer to COM's letter to FEMA and CWCB, dated May 2, 1980). The peak discharges have been summarized in Table 1. The Arkansas River at Salida was also studied by COM in order to develop a 100-year floodplain by approximate methods in this reach of the river. No hydrologic data was found during a literature review ans therefore a statistical gage station analysis was performed for the USGS gage on the Arkansas River at Salida was performed as outlined in Reference 15. The peak discharges were estimated for the 10-, 50-, 100-, and 500-year frequencies at the Salida gage and used in the approximate floodplain analysis. The hydrologic results have been tabulated in Table 1. 15