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<br />1778 <br /> <br />"",C.,,,,_ ",,. -d.. . .1 ~.:'11':~;~::';~<' <br />:~':':~:'~~12~Y~f~;~:1?~~}~~ D:::g~'~S ~ <br />~:Jbiect ~'O ~<:9V1SI0n <br />Figure 3 near here. Example dia,gI:;l~! ..~-:;: (j I - h$E <br /> <br />f'!ii:~lng Ap?l'ovol by Director, <br />U.S. G:;:o!C9k~1 S~r/e'l <br /> <br />. <br /> <br />Acknowledgments <br /> <br />The authors would like to thank the many individuals who assisted in the collection of these data. Thanks <br /> <br />goes to hydrographers Frank Kipple and Anthony Gutierrez of the State of Colorado for their sample collection <br /> <br />activities. Additionally, thanks is extended to Paul Martin and George Woods of the Pueblo Board ofWarer Works <br /> <br />for their excellent work collecting numerous water-quality samples in the upper basin. Finally, thanks goes to Jef- <br /> <br />fery West, Charles M Moore, and Matthew Kurchinski of the United States Geological Survey for their tireless <br /> <br />effort under harsh conditions. <br /> <br />STREAMFLOW <br /> <br />0" __ .__ _____ <br />.. . . <br /> <br />majority of the total annual streamflow. Transmountain diversions of water from the Colorado River Basin are sup- <br /> <br />plied from several sources high in the basin. Much of this water is routed to Twin Lakes Reservoir (plate I) via <br /> <br />closed conduit and open channelllow (Abbott, 1985). The transmountain water is Slored in Twin Lakes Reservoir <br /> <br />until it is released to meet downstream irrigation and municipal-supply demands. During the study period, April <br /> <br />1990-March 1993, the mean-monthly streamflow of the Arkansas River ranged from 70 tt3/s at Leadville to 688 <br /> <br />tt3/s at Parkdale. Water released from Twin Lakes Reservoir via Lake Creek (plate I) is the largest source oftrib- <br /> <br />urary flow to the ArkansaS River. The mean-monthly reserVoir release from Twin Lakes Reservoir was 284 tt3 Is: <br /> <br />these reservoir releases represented about 45 percent of the annual flow at Granite, the next downstream main-stem <br /> <br />site, and about 35 percent of the total annual flow at Portland, the downstream end of the upper basin. <br /> <br />Streamflow in the upper Arkansas River exlubits large seasonal variability and can be separated into three <br /> <br />distinct flow regimes: low flow (October-April), snowmelt runoff (May-June), and post-snowmelt runoff (July- <br /> <br /> <br />. September). Streamflow is relatively small during the low-flow period and is maintained by natural baseflow and <br /> <br />8 <br />