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. lHHr/ b 2. . water supply is available, cDnsumptive use is limited by the pDtential cDnsumptive use requirement. . Return flDWS were calculated on the basis Df diversions less cDnsumptive use. Return flDWS frDm the FlDrida Mesa cDnsist Df tWD cDmpDnents-surface returns and grDundwater returns. ND recDrds are available cDncerning histDric return flDWS frDm the FIDrida Mesa at various locatiDns alDng the Animas and FIDrida Rivers. The timing of return flDWS is affected by the reuse Df surface return flDWS on the FIDrida Mesa and variable tDpDgraphy and subsurface cDndi- tiDns. Return flDWS assDciated with irrigatiDn Df 4,213 acres are estimated to be tributary to the Animas River. Return flDWS associated with irrigatiDn Df 11,121 and 1,480 acres are estimated to be tributary to the FIDrida River in Segments 1 and 2, respectively, thrDugh Pine Gulch and other tributaries. It is assumed that the return flow vDlume tD each river segment is prDpDrtiDnal tD the relative amount of irrigated area cDntributing such return flDWS. An empirical methDd was used tD estimate the mDnthly pattern of return flows based Dn the monthly histDric flDWS Df Salt Creek and the Dbserved gains in the IDwer reaches Df the Florida River. The flow Df Salt Creek at the USGS gaging statiDn primarily cDnsists Df irrigatiDn return flDWS frDm water diverted from the LDS PinDs River. An analysis was made Df return flDWS to the FIDrida River fDr the years Df belDw-average runoff fDr the periDd of recDrd 1968-1980. Return flDWS frDm the FlDrida Mesa were estimated tD be equal tD the Dbserved FIDrida River gain frDm the gaging station belDw the FIDrida Farmers Ditch to the BDndad gaging station con-ected fDr Salt Creek inflow, estimated natural inflDw, and irrigation depletions. A summary Df the estimated return flDW pattern is presented in Table 3. . . . . . . IrriRation Depletion in SeRment 2 other than the Florida Mesa Segment Z includes the area dDwnstream of the FIDrida Farmers Ditch and upstream of Salt Creek. Since the irrigated areas in Reach 2, tDtaling abDut 1,370 acres, are located near the stream channel, mDnthly stream depletion was estimated to be approximately equivalent tD the monthly cDnsumptive use. An adequate water supply was historically available tD meet the full crDp CDn- suniptive use requirements. Diversions were made by the Harris PattersDn, . -13- . 1:;;~""