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I I I I I I I I I I I I I I I I I I I The streamflows observed in 1980 and 1983 were the largest annual volumes in the historic record. Conversely, the 1981 annual total of 72,200 ac-ft was less than any other year except 1954 (52,700 ac-ft) and 1977 (63,100 ac-ft) while 1982 was essentially an average year. It is our opinion that the streamflow sequence observed during the 1979 through 1984 period provided an excellent test of the accuracy of the model. 8.3 DEVELOPMENT OF COMPUTER MODEL TO SIMULATE CBT-VINDY GAP SUPPLIES A brief description of the CBT and WGP operational model was provided in Section 5.2, additional details of which may be found in the Technical Appendix. Results from the model were compared to reported inflows to the CBT project as reported in the AOPs (Annual Operating Plan) for water years 1980 to 1983 (see Table 8-3). The comparison shows that the model was accurate in computing inflows for these years, producing inflows which were within one to two percent of those indicated by the available data. The operational model was therefore appropriate for use with the subsequent analyses. 8.4 WATER AVAILABILITY FROM INDIVIDUAL SOURCES The availability of water from the four sources of water supply was evaluated using the 1000-year synthetic records described earlier in terms of drought severity. Table 8-4 summarized the annual available supplies for the 25-, 50-, 100-, and 200-year drought events. The City values show the amounts of water which would be available at the four recurrence intervals from the City's direct diversion rights. The Ditch columns show the total water available from the City's ownership (per the Transfer Decree) of various irrigation rights under the 2000-moderate and 2015-moderate scenarios. The CBT column shows the inflow available to the CBT project; these values represent the annual amounts of water available 8-12