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. IJflOnS . . . . . . . RunDff was estimated tD be prDpDrtiDnal tD mDnthly precipitatiDn at IgnaciD in excess of Dne inch. This methDd prDvides a rDugh esti- mate of mDnthly inflDWS. Since the tDtal estimated vDlume Df such runDff (5,500 acre-feet per year) is equal tD Dnly seven percent of the estimated virgin flow at BDndad, the cDntributiDn Df runDff frDm the areas adjacent tD the lDwer Florida River is relatively insignifi- cant. 2. The initial estimate Df tributary inflDw was adjusted thrDugh cali bra- tiDn Df the histDric streamflow estimates against the available gage recDros. An DperatiDn study Df the FIDrida River was cDnducted tD provide reasonable estimates Df mDnthly historic streamflDWS fDr each stream segment. The operatiDn study included monthly gage recDrds, estimates Df irrigatiDn diversiDns and return flows, Durango water use, and tributary inflDws. Adjustments were made in the estimates of tributary inflDws as initially develDped frDm the informatiDn present Dn Figure 2. Since there may be inaccuracies in the data fDr stream gage measurements, tributary inflows, irrigatiDn diversiDns, and irrigatiDn return flDWS, it was impDssible tD achieve a calibration which eliminates all discrepancies in the data. The estimated average annual runDff value for each Df the tributary areas as listed in Table 8 was derived Dn the basis of all Df the avail- able data fDr the FIDrida River basin. The estimated histDric streamflDws fDr the FIDrida River are listed in Tables 9 through 11. FDr the years in which recDrds are available fDr the BDndad and FIDrida Farmers Ditch gage sites, actual historic gage recDrds were used in the summaries Df histDric flows. . . . -19- ,j~,:~