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gaged flow was available to the aggregated nodes. In addition, node ADY_027, representing the <br />Green River use in Wyoming, was made a baseflow node in order to supply that use with water. <br />Finally, the node at the head of Dome Creek (582216) was also configured as a baseflow node. <br />Appendix D.3 and D.12 describe these Phase IIIa enhancements. <br />4.1.3 Base Streamflow File - yampaTH.xbm <br />Base streamflows represent gaged and ungaged streamflows that have had the impact of historical <br />diversions, return flows, and reservoir operations removed. These are the flow conditions upon <br />which diversion, reservoir, and minimum streamflow demands are superimposed. The file <br />yampaTH.xbm contains base streamflows estimates from water years 1975 to 1991 at the locations <br />listed in the river station file, yampaT.ris. It was generated by the baseflow module of StateMod <br />using historical streamflows, diversions, EOM contents of modeled reservoirs, and estimated <br />diversion efficiencies and return flow patterns. Table 4.1.3a shows the baseflows at all gage <br />locations, comparing them with historical, measured streamflow. <br />Phase IIIa enhancements that impacted the base streamflow file included revision of drainage areas <br />and average precipitation data at selected locations, as described in Appendix D.13. <br />TABLE 4.1.3A <br />Streamflow Comparison <br />Average Annual Flow (acre - feet/year) 1975 -1991 <br /># I <br />USGS # <br />Name <br />Base <br />Streamflow <br />Historical <br />Streamflow I <br />Difference <br />1 <br />9236000 <br />BEAR RIVER NEAR TOPO FLO <br />28361 <br />28246 <br />114 <br />2 <br />9237500 <br />YAMPA RIVER BELOW ST FLO <br />80094 <br />63374 <br />16720 <br />3 <br />9238900 <br />FISH CR AT UPPER STA FLO <br />46044 <br />44097 <br />1947 <br />4 <br />9239500 <br />YAMPA RIVER AT STEAM FLO <br />353920 <br />327050 <br />26870 <br />5 <br />9241000 <br />ELK RIVER AT CLARK FLO <br />238029 <br />231396 <br />6632 <br />6 <br />9244410 <br />YAMPA RIVER BELOW DI FLO <br />799084 <br />744721 <br />54363 <br />7 <br />9245000 <br />ELKHEAD CREEK NEAR E FLO <br />43001 <br />43001 <br />0 <br />8 <br />9246920 <br />FORTIFICATION CREEK FLO <br />9745 <br />8710 <br />1035 <br />9 <br />9247600 <br />YAMPA RIVER BELOW CR FLO <br />1021775 <br />941676 <br />80099 <br />10 <br />9249000 <br />EAST FORK OF WILLIAM FLO <br />87995 <br />86452 <br />1543 <br />11 <br />9249200 <br />SOUTH FORK OF WILLIA FLO <br />31397 <br />31381 <br />16 <br />12 <br />9249750 <br />WILLIAMS FORK AT MOU FLO <br />175750 <br />168243 <br />7507 <br />13 <br />9251000 <br />YAMPA RIVER NEAR MAY FLO <br />1249587 <br />1142093 <br />107494 <br />14 <br />9253000 <br />LITTLE SNAKE RIVER N FLO <br />173532 <br />171533 <br />1999 <br />15 <br />9255000 <br />SLATER FORK NEAR SLA FLO <br />65130 <br />61880 <br />3250 <br />16 <br />9258000 <br />WILLOW CREEK NEAR DI FLO <br />8407 <br />8108 <br />299 <br />17 <br />9260000 <br />LITTLE SNAKE RIVER N FLO <br />482123 <br />422016 <br />60107 <br />18 <br />9260050 <br />YAMPA RIVER AT DEERL FLO <br />1754041 <br />1591941 <br />162099 <br />River System 4 -4 <br />