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A. Virgin River Above La Verkin Springs This data represents the Virgin River just upstrtam of the La Verkin Springs. The flow data is from the previous La Verkin Springs investigation (USBR, February 1979). The water quality at this point in the river system is assumed to be the same as at Virgin, Utah. The water quality data is from a masters thesis (Trudeau, August 1979). B. La Verkin Springs This data represents the flow contribution to the Virgin River from the La Verkin Springs. The data is fro~1 the previous investigation (USBR, February 1979) and a masters thesis (Trudeau, August 1979). C. Intervening Flow Between Above La Verkin Springs and Ne~r St. George This data was calculated for the existing river system by adding the flow at above La Verkin Springs ana La Verkin Springs, then subtracting this sum from the flow near St. George. Flow applies both to water and salt in this discussior,. D. Virgin River Near St. George This is the midpoint of the study arta. The data is from the previous La Verkin Springs investigation (USBR, February 1979) and a masters thesis (Trudeau, August 1979) . This point represents the river system below La Verkin Springs and the quality of water that is assumed to infiltrate 1nto the ground. For post project conditions, this point is calculated as the sum of the flow above La Verkin Springs, Quail Creek Reservoir replacement water for La Verkin Springs, and the intervtning flov: between above La Verkin Spring~ and near St. GeorgE. E. Infiltration Loss Tnis is an assumed loss to the surface water system that occurs below St. George near Bloomington, Utah. The previous investi9ations (USBR, February 1979; Trudeau, Au~ust 1979) sugge~ted that this loss can range from 20 ft /sec. to 100 ft /sec. The previous investigations (USSR, February 1979; Truaeau, August 1979) also suggested that this infiltration loss could be the sourCt of the Littlefitld Springs, AZ flow. 7 002621