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. 000767 . as snmmarized abDve. The missing data were estimated through use of an opera- tiDn study Df the FIDrida River. FDr example, nD recDrds at either gaging statiDn were available in January 1951 thrDugh September 1956, Sol an estimate of the flDW at these locatiDns was made by the fDllDwing methDd: . . FIDw at BDndad gage site = Estimated flDW below LemDn Reservoir + Tributary inflDws - Irrigation diversiDns - City of Durango diversiDns + Estimated irrigatiDn return flows A simlar calculatiDn was used to estimate streamflDws fDr the FlDrida Farmers Ditch gaging station. . Tributary inflDws cDntribute tD the Dverall streamflDw Df the FIDrida River in respDnse to snDwmelt runDff and rainfall events. Estimates Df tributary inflows were made through a tWD part analysis: . . . . . . 1. Initial estimates of runoff were made fDr each tributary area belDw LemDn ReservDir, based Dn the drainage basin size, elevatiDn, and aspect. Figure Z is a graphical presentatiDn Df the apprDximate annual runDff generated per square mile, plotted against mean basin elevatiDn, fDr a number of drainage basins in the San Juan basin. Figure Z alsD includes estimates Df average annual runDff for specific tributary areas in the Florida River basin. The basic data used in preparing Figure Z is presented in Table 7. A summary Df the estimat- ed annual runoff fDr the tributary areas in the FIDrida River basin is presented in Table 8. The monthly inflDws from the upland areas were estimated through use of streamflDw recDrds of Lightner Creek in the Animas River basin. A descriptiDn Df the methDdDIDgy used in estimating Lightner Creek flows is presented in the "Animas River HydrDIDgy Analysis" repDrt by Wheeler dated June 1987. Runoff frDm the relatively lDw areas adjacent tD the FIDrida River, as listed in Table 8, was estimated thrDugh use Df Ignacio precipitatiDn records. -18- .jI" ,'...