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<br />For t~is analysis, the infiltration loss is assumed to be <br />60 ft /sec, the same as the flow of Littlefield Springs <br />(USSR, February, 1979; Trudeau, August 1979. If this <br />infiltration is not the source of Littlefield Springs, it is <br />considered a loss to the system. The result is an immediate <br />reduction in salt loading to Lake Mead that remains constant <br />throughout the project life. If this infiltration is the <br />source of Littlefield Springs flow the result is an <br />immediate reduction in salt load1ng to Lake Mead which would <br />last for a minimum of 22 years (the assumed travel time <br />through the underground system (USSR, February 1979; <br />Trudeau, August 1979)). After a minimum of 22 years the <br />quality of Littlefield Springs would improve and a greater <br />reduction in salt loading to Lake Mead would result. This <br />increased reduction in salt loading would last for the <br />remainder of the project life. <br /> <br />F. Intervenin Flow Between the Vir in River Near St. Geor e <br />and the Virgin River at Littlefie d Gage <br /> <br />This data was calculated by subtract1ng the infiltration <br />loss from the flow (and salt) at St. George, adding to this <br />difference the flow (and salt) contributed by Littlefield <br />Springs, above the river gage at Littlefield Springs, and <br />subtracting this result from the flow (and salt) at <br />Littlefield Springs. This calculation is shown in equation <br />form below: <br /> <br />Intervening <br />Flow Between = <br />St. George and <br />L itt 1 Efi e 1 d <br /> <br />Flo," at <br />Littlefield <br />Gage <br /> <br />W10W <br />- at <br />St. George <br /> <br />Infiltration <br />Loss + <br /> <br />Littlefield ] <br />Springs <br />Flow <br /> <br />G. Littlefield Springs <br /> <br />This data is from tht previous investig6tio~ (USSR, <br />February IS7S) ana 0 r,iesters th~SlS (Truoc6u, ;',ugust 1~79). <br />This data shows a flow of 60 ft /sec. above the gage at <br />Littlefield with a qUclity of 292l: r,g/L. <br /> <br />H. Virqin River at L1ttlefield Gage <br /> <br />This data represents the last p01nt in the study area. This <br />data is from previous investigations (USBR, February 1979; <br />Trudeau, August 1979). This is the last major gage on the <br />Virgin R1ver before it enters Lake Mead. The station can be <br />calculated for post project conditions as follows: The fluv: (and <br /> <br />8 <br /> <br />002622 <br />