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2 Evaluation of Streamflow Losses Along the Gunnison River from Whitewater Downstream to the Redlands Canal Diversion Dam, near Grand Junction, Colorado, Water Years 1995-2003 Introduction users. A responsibility of the BOR is management of the The Gunnison River is a major tributary of the Colorado River and provides about 42 percent of the Streamflow of the Colorado River at the Colorado-Utah State line (Kuhn and Parker, 1992). Administration and management of water resources in the Gunnison River basin are shared by many water-resource agencies, including the Colorado Division of Water Resources (CDWR) and the Bureau of Reclamation (BOR). A responsibility of the CDWR is administration of water-use rights for agricultural, industrial, and municipal 108°35' 39°O5~ 39°00~ P .. ~ ~ ~'` vC`~ A ~ " ~heaianas A-~~~ ~ Stdtl( ~ 1~ 1 - ~~I ~.cT- ~ r9 ~, Aspinall Storage Unit, which consists of Blue Mesa, Morrow Point, and Crystal Reservoirs. Since the mid-1990s, the use of web-based, real-time dis- charge data has become increasingly important for the adminis- tration of water-use rights and management of water resources in the Gunnison River basin. One particular reach along the Gunnison River where these data are used is from the town of Whitewater downstream to the Redlands Canal diversion dam (fig. 1). Three Streamflow-gaging stations (fig. 1) (hereinafter referred to as station or gaging station) that provide real-time r ~~ - ` -.~ ~.. ~ ~ tr ~ v ~ i f S W ~~.. ~ ._ '~ ., Streams base: U.S. Geological Survey, Digital Line Graph, 1:100,000, 1974, 1985, Albers Equal Area Conic projection NAD83, Standard parallels 37°30~N and 47°30'N, central meridian 105°00'W, NAD83. Roads base: ESRI, 1:1,000,000, 1999, Albers Equal Area Conic projection, Standard parallels 37°30'N and 47°00'N, central meridian 105°00'W, NAD83. Elevation base: U.S. Geological Survey, National Elevation Dataset, 1:100,000, 1990, Universal Transverse Mercator, Zone 13N, NAD83. EXPLANATION Whitewater station Streamflow-gaging station and name as used in this report M1 ~ Miscellaneous discharge-measurement site and name as used in this report (See [able 1 for atlditional station and site details) "~' -~ ~.~ a~ 0 2 4 MILES 0 2 4 KILOMETERS 108°25~ ~.i ~~ i ~v Figure 1. Location of Streamflow-gaging stations and miscellaneous discharge-measurement sites along the Gunnison River study reach.