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<br />/ <br /> <br />1. Compare the quality of Littlefield Springs flow and the <br />quality of the Virgin River near St. George under pre-project <br />conditions, i.e.., with La Verkin Springs unchanged. <br />Subtract the qualities3to establish the salt pickup for all <br />ions except Ca and HCO which are assumed to remain constant <br />(Table 4). <br /> <br />2. Add the quality of the post project flow of the Virgin River <br />near St. George (Step #H above) and the salt pickup <br />determined above (Step #K2). The result is the quality of <br />the Littlefield Springj after 22+ years of project life <br />assuming that the 60ft /sec infiltration Near Bloomington is <br />the source of Littlefield Springs (Table 5). <br /> <br />L. Calculate the Virgin River flow and quality at Littlefield gag,e <br />considering the improved quality of Littlefield Springs from <br />K2 above (Table 6). This calculation is sho*~ below: <br /> <br />Virgin River <br />at <br />Littlefield <br /> <br />Virgin River <br />near <br />St. George <br />(from Step <br />#H) <br /> <br />Infiltration <br />Loss <br /> <br />Littlefield <br />Springs <br />(from Step + <br /># K2) <br /> <br />Intervening <br />Between Near <br />St. George <br />and Virgin <br />River at <br />Littlefield <br />(from Step <br />#~ <br /> <br />The result is the Virgin River flow and salinity at Littlef~eld <br />gage after 22+ years of project life assuming that the 60ft /sec <br />infiltration near Bloomington is the source of Littlefield Springs. <br /> <br />M. Take the difference in Virgin River salt loading between <br />pre-project conditions (Table 2) and the post project condition <br />after 22+ years (Table 6) at Littlefield and apply the future <br />effect equation (Progress Report No. II, January 1983) for <br />removal of salt above Parker Dam. <br /> <br />This yields the s2~inity reduction at Imperial DE~ due to this <br />pro]3ct after 22+ years of project operation assuming that the <br />60ft /sec infiltrRti0p near Bloomin~ton, ftah, is the source of <br />Littlefield Springs, AZ (Table 6). <br /> <br />V. DATA DESCRIPTIONS <br /> <br />The data used for this analysis is from the hvdrolo~y appe~dix for the <br />previous La Verkin Springs investigation (USBR, February 1979) and from a <br />masters thesis (Trudeau, August 1979). A description of each piece of data <br />used in the analysis, as presented in the schematic in Figure 2, is <br />presented below: <br /> <br />6 <br /> <br />002620 <br />