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3-2 I I I I I I I I I I I I I I I I I I in the canal vary from 15 to 36 percent and are estimated to average 30 percent with the existing system and 25 percent with the project, Losses are fairly constant throughout the length of the canal as indi- cated on Table 8, Combined seepage and gate losses presently average about 0.89 cfs/mi, Due to the operation requirements during anyone irrigation season. the water losses vary, During low water years, such as 1976. canal flow is intermittent and the canal never "seasons" with attendant hi gh seepage losses resulting, During normal water years. the flow is continuous allowing the canal to be "seasoned" which substantially reduces the seepage losses. A summary of the canal losses, intercepted flow, bypassed flows and canal diversions are shown on Table 10 with the existing system for the years 1967 (above normal water supply). 1976 (below normal water supply) and for the average water supply with the project, Project canal losses were determined uSing the average year water supply with the project from Table 10 and subtracting the proposed improvement water savings from the existing losses, A summary of the average year existing and project losses is shown on Table 9. WATER SUPPLY The Amity system receives water from Arkansas River Diversions and in- tercepted flows at various points along the system, River diversions are measured using a 20-foot Parshall Flume; tributary inflows are calculated by multiplying estimated net inflow rates times duration for each tributary. Historical diversions from the Arkansas River and re- leases from the Great Plains Reservoirs are shown in Table 11, As shown by the table. the volumes of water diverted into the system from all sources have varied during the past twenty-three years by a factor of nearly ten, The minimum water diverted occurred in 1964 and totalled 16,200 acre-feet. The maximum water diverted occurred in 1966 and to- talled 140.700 acre-feet, The average flow diverted equals 73.900 acre~feet. Table 2 in the Summary shows the existing and project added water supply for the average year. The existing supply is 54,950 acre-feet. The project will add 6,740 acre-feet to the annual average supply based on diversions since 1960. The increase will be realized by restoring historical diversion capacity at Big Sandy Creek and by reducing canal losses by rehabilitation of old and leaking structures. No new water rights are involved, Total supply will be 61.700 acre-feet. WATER RIGHTS Decreed flow and storage rights are listed in Appendix C, The flow rights total 3193,5 cfs and decreed storage is 280,752 acre-feet,