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<br />n\HJ;3B'~ <br />ty --,;:,. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />3. The following relative runoff amounts were estimated through use <br />of the precipitation and drainage area relationships: <br /> <br /> Mean Drainage Runoff <br /> Precipitation Area Originating <br /> Within Reach Within Reach In Reach <br /> Reach (inches) (sq-mil (% of total) <br />West, Middle, and <br />East Mancos Rivers <br />to Weber Canyon 19.2 139 27 <br />Weber Canyon to <br />Navajo Canyon 14.6 129 20 <br />Navajo Canyon to <br />Highway 666 12.4 193 24 <br />Highway 666 to <br />Aztec Wash 10.9 262 29 <br /> Totals 723 100 <br /> <br />4. Tables 17 through 20 provide summaries of the estimated short- <br /> <br /> <br />term runoff for each reach, using the percentages listed above. <br /> <br />River Gains - Annual Analysis <br /> <br /> <br />The streamflow downstream of the confluence of the West, Middle, and <br /> <br /> <br />East Mancos rivers is affected by irrigation depletions, consumptive use of <br /> <br /> <br />water by phreatophytes (stream losses), short-term runoff events, snowmelt <br /> <br /> <br />rWlOff, and year-round discharge from springs. The water balance for the Mancos <br /> <br /> <br />River in the reach between the upper gage location and the gage near Highway <br /> <br /> <br />666 is expressed by the following relationship: <br /> <br />(1) Historical Flow at Highway 666 = Virgin Flow at Upper Gages <br />- Inigation Depletions <br />- River Losses <br /> <br />+ Short-Term Runoff <br /> <br />+ River Gains <br /> <br />-36- <br /> <br />\0;. <br />