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<br />Infrastructure changes have reduce return flows: <br /> <br />· Lining of canals and pipelines decreases <br />seepage losses. <br />· Capture of sewage effluent from trans-mountain <br />diversions. <br />· Increase in phreatophyte consumptive use. <br />· Endangered species requires more water to be <br />delivered downstream. <br />· Improved on farm irrigation efficiencies have <br />reduced deep percolation. <br />