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<br /> <br />I!' <br />r <br />! <br /> <br />" <br />, <br />i <br /> <br />gages through water year 1994. (The databases used for this summary contained no bed-load <br />measurements.) Information relating to the peak flow data was obtained from a database <br />maintained by Hydrosphere Data Products, Inc., and information relating to mean daily flow, <br />suspended sediment, and bed material data were obtained from a database maintained by <br />Earthlnfo, Inc. Tables 1 through 4 include the period of record for each data type, record count, <br />and summary statistics for the discharge records for all the mainstem gaging stations and the <br />downstream-most stations on tributaries within the reaches of interest. <br /> <br />2.2 Data from Individual Studies <br /> <br />Data from individual studies include cross sections, longitudinal profiles, streamflow <br />measurements, bed material, bed load, and suspended sediment load. The studies from which <br />these data were derived were performed to address a variety of issues, including sediment <br />transport dynamics, sediment budgets, incipient motion conditions, and substrate conditions at <br />vegetation study sites. The data summaries are sorted by stream and data type. Tables 5 <br />through 10 summarize data collected on the Yampa River (and the lower portion of the Little <br />Snake River) and Tables 11 through 16 summarize data collected on the Green River. The <br />summaries include the location at which the data were collected, the date, investigator(s) and <br />organization, a publication reference if available, data collection method, and, where appropriate, <br />clarifying remarks. The cross-section data include data obtained by a variety of methods, <br />including traditional survey methods, sonar traces, and depth profiles from discharge <br />measurements. Longitudinal profiles include data from cross-section surveys in which the cross <br />sections were tied together, horizontally and vertically, as well as surveys of the channel thalweg, <br />water-surface elevations, high-water marks, and slack-water deposits. Bed material data include <br />qualitative assessments of the channel substrate, results from sieve analysis of bulk bed and bank <br />samples, and samples obtained using the Wolman pebble count technique. All bed-load data <br />were collected using a 3-inch Helley-Smith bed-load sampler. Suspended-sediment data were <br />collected using standard USGS methods with the appropriate sampler. <br /> <br />In addition to the above information that was compiled primarily from hydraulic, geomorphology, <br />sediment transport studies, and stream-gaging studies, a summary of known PHABSIM studies <br />is presented in Table 17. <br /> <br />3. REFERENCES <br /> <br />Andrews, ED., 1978. Present and Potential Sediment Yields in the Yampa River Basin, Colorado <br />and Wyoming. U.S. Geological Survey, Water Resources Division, Water Resources <br />Investigations 78-105, December. <br /> <br />Andrews, E.D., 1980. Effective and Bankfull Discharges of Streams in the Yampa River Basin, <br />Colorado and Wyoming. Journal of Hydrology, 46(1980), pp. 311-330. <br /> <br />Andrews, E.D., 1986. Downstream Effects of Flaming Gorge Reservoir on the Green River, <br />Colorado and Utah. Geological Society of American Bulletin, Vol. 97, August, pp. 1012- <br />1023. <br /> <br />Andrews, ED. and J.M. Nelson, 1988.. Topographic Response of a Bar in the Green River, Utah, <br />to Variation in Discharge, U.S. Geological Survey Water Resources Division, Lakewood, <br />Colorado. <br /> <br />2 <br /> <br />Mussetter Engineering. Inc. <br />