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<br />. <br /> <br />nnn7n3 <br /> <br />. <br /> <br />records. Runoff was estimated to be proportional to monthly precipitation <br /> <br /> <br />at Ignacio in excess of one inch. This method provides only a rough estimate <br /> <br /> <br />of monthly tributary inflows. Since the total estimated volume of such runoff <br /> <br />in the Animas River basin (6,500 acre-feet per year) is equal to only one percent <br /> <br /> <br />of the estimated virgin flow at Durango, the contribution of runoff from the <br /> <br />areas adjacent to the lower Animas River is relatively insignificant. <br /> <br />. <br /> <br />. <br /> <br />Animas River Histmic Flow Estimates <br /> <br /> <br />Historic streamflow estimates at each reach location upstream of the <br /> <br /> <br />Durango gage were made through use of the following relationship: <br /> <br />. <br /> <br />Flow at specified location = Historic flow at Durango gage <br />+ Municipal net diversions upstream of Durango <br />+ Irrigation depletions upstream of Durango <br />- Tributary inflows <br /> <br />. <br /> <br />Historic streamflow estimates at each reach location downstream of Durango <br /> <br /> <br />were made through use of the following streamflow relationship: <br /> <br />. <br /> <br />Flow at specified location = Historic flow at Durango gage <br />+ Municipal return flows downstream of Durango <br />+ Tributary inflows <br />+ Return flows from the Florida Mesa and <br />Pine, Ridge Ditch diversions <br />- Irrigation depletions downstream of Durango <br /> <br />. <br /> <br />The estimated historic streamflows for the Animas River are listed in <br />Tables 10 through 16. <br /> <br />. <br /> <br />. <br /> <br />-19- <br /> <br />. <br /> <br />;~ ,- <br />