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changes in a reach. The analysis will use existing <br />sediment records and will include investigation of <br />the use of automatic sediment samplers and a flow <br />event alert system on tributaries. [A draft of <br />this study will be completed by June 30, 1989.] <br />Estimated Cost: $25,000 <br />Responsible Parties: USGS, Glen Canyon Environmen- <br />tal Studies (GOES) Office. <br />Time to Complete: 1 year. <br />(b.) Step 2: Re-establish USGS Gaging <br />Stations (Contingent upon completion of <br />step 1.). <br />Major Premise: Five mainstem gaging stations along <br />the Colorado River and two tributary gaging <br />stations may be necessary to understand sediment <br />sources, sinks, and transport to beaches and <br />riparian zones. Reinstallation of some gages may <br />be required prior to initiation of data collection. <br />Four surface-water gages are already in place <br />(Colorado River at Lee's Ferry, near Grand Canyon, <br />Paria River, and Little Colorado River), while <br />other gages will require installation of surface- <br />water gages (Colorado River above Little Colorado <br />River, National Canyon, above Diamond Creek, and <br />Kanab Creek). Tributary gages may require instal- <br />lation of sediment-sampling equipment. <br />Estimated Cost: $100,000 <br />Responsible Parties: USGS, GCES Office. <br />Time to Complete: 6 months. <br />3. Determination of the relationship between <br />power release records and Glen Canyon Dam <br />discharge. <br />Major Premise: Discharge from Glen Canyon Dam is <br />currently determined from power production records. <br />A large and inconsistent difference between the <br />power release records and the gaging station <br />measurements at Lee's Ferry has introduced incon- <br />sistencies to the analysis of all technical study <br />components. The work will involve reinstallation of <br />the cableway, cablecar and associated equipment, <br />and a staff gage at the gaging station 3/4 mile <br />downstream from Glen Canyon Dam. Releases must be <br />6