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<br />,'" . <br /> <br />I, <br /> <br />" <br /> <br />(',. <br /> <br />:.. <br /> <br />'I. <br /> <br />.... <br /> <br />:j.....: <br /> <br />~/.b..;.. <br />.-' ~-~. ': <br />::....,;.:; <br />.'.:.~. <br /> <br />.'j'. <br /> <br />,'.-.., <br /> <br />., <br /> <br />OOO~'i'~ <br /> <br />c;; <br />Sl <br />~ <br />.JIL <br />wO <br />~ ::;: 5400 <br />.J~ <br />0(1- <br />W<( <br />",0 <br />w...J <br />~ ~ 5350 <br />III I- <br /><(a: <br />I-w <br />w> <br />we.> <br />~ ~ 5300 <br />-'0 <br />wO <br />Ow <br />~Cl <br />!::...J <br />I- <( 5250 <br />...JZ <br /><(0 <br />i= <br /><( <br />~ <br /> <br /> <br />PIERRE SHALE <br /> <br />PIERRE SHALE <br /> <br />o 1000 <br />Illllllllr! <br /> <br />2000 FEET <br />I <br /> <br />EXPLANATION <br />PREDOMINANT GRAIN SIZE OF ALLUVIUM <br />8=:::=::0 SILT AND CLAY _ SAND _ SAND AND GRAVEL <br /> <br />Figure 2.--Geologic cross section of Fountain Creek valley (modified <br />from Jenkins, 1964,. pI. 2; cross-section trace shown in fig. 5). <br /> <br />Most streamflow in Fountain Creek is derived from the following sources: <br />(1) Snowmelt runoff from the headwaters in the mountainous areas and lower <br />basin areas outside the study area, primarily during April, May, and June; <br />(2) rainfall runoff from thunderstorms in the basin, usually during May <br />through September; (3) return flows from municipal, agricultural, and indus- <br />trial water use; and (4) ground-water discharge frop~the alluvium to Fountain <br />Creek. Sources (3) and (4) generally provide '.streamflow throughout the year. <br /> <br />Because of population growth, the average rate of total daily discharge <br />into Fountain Creek by the Colorado Springs Wastewater Treatment Facility <br />(fig. 1) has increased from 18.1 ftl/s during 1965 to 46.4 ft'/s during 1985. <br />During 1985, total daily discharge from the wastewater treatment facility <br />ranged from 35.0 to 59.8 ft'/s, whereas the transmountain return-flow <br />component of the total daily discharge ranged from 0.2 to 44.9 ftl/s. About <br />55 percent of the total annual discharge was attributable to transmountain <br />return flows during 1985 (about 25.5 (ft'/s)/d). Expected additional growth <br />by the city of Colorado Springs will result in greater water use and larger <br />volumes of discharge from the wastewater treatment facility. The proportion <br />of transmountain return flows also will increase because additional native <br />water supplies currently (1986) are not available to the city of Colorado <br />Springs, which results in. increased reliance on transmountain water for new <br />water supplies. <br /> <br />6 <br />