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. . l:. 1868 A reconstruction of the Trinidad Reservoir operation with the transfer of water out of the Model right eliminate? an? with winter s~orage recorded under the Mode 1 ri ght was performed to 1 dent lfy the changes 1 n water stored that have occurred as a result of these practices. This reconstruction showed the following changes in the amounts of water placed in storage: 1."1': Year Annual Change in Water Storage in Trinidad Reservoir Actual Operation Minus Reconstructed Operation 1979 1980 1981 1982 1983 1984 TOTAL ANNUAL AVERAGE 1,054 A.F. 30,068 A.F. - 8,634 A.F. 8,709 A.F. 6,274 A.F. -13,616 A.F. 23,855 A.F. 3,976 A.F. A month ly surrunary and exp 1 anat i on of the computat ion procedure are contai ned in Appendi x 11. The above fi 9ures reasonab ly represent the increase in water supp ly to the District accomplished through these water rights administration practi~es. Further analysis is required to determine the impact that these practices had on the inflow to John Martin Reservoir. Following discussion with the States of Kansas and Colorado and the Purgatoire Water Conservancy District, the methodology employed in the 1961 and 1964 operation studies was used to determine the impacts on the inflow to John Martin Reservoir. A computer model was first developed to reconstruct the 1961 study. The results of the computer model were com- pared to the original 1961 study to verify the validity of the model. The results compared favorably and the model was judged to be satisfactory (see Appendix Ill). The computer model and input data were then modified to fit the parameters of the 1964 study. The original 1964 study modified the 1961 study by changing distribution of the water within the District and determining the bypasses on a daily basis rather then a monthly basis. While the original 1964 study deve- loped most of the information presented in the 1961 study, it did not determine the effects on the inflow to John Martin Reservoir. However, the computer model does calculate the impacts to the inflow to John Martin Reservoir using the cri- teria contained in the 1961 study. This computer-based reconstruction of the 1964 study is hereafter referred to as the base 1 i ne study. More detai 1 ed i n- formation on the computer program and calibration is contained in Appendix III. The impact on the inflow to John Martin Reservoir during the 1979-84 review' peri od as a resu 1 t of the transfers out of the Mode 1 ri ght and the wi nter storage under the direct flow rights was computed for three different sets of assumptions, hereafter referred to as Case 1, Case 2 and Case 3. Under both Case 1 and Case 2, the computation shows the difference in the actual inflow as compared to what would have occurred had the full 19,717 acres under the project .~ . 12 :1 ,:.:/:~~.:;;. ~ ."". '".:<; .<'~ II ,.,"",",.,,',., I "',C{' I