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<br />50 <br /> <br />storage capacity has some advantages over upstream reservoirs. Evapora- <br />tive losses are very small from groundwater storage compared .to surface <br />reservoirs. Flexibility in delivering water at needed locations on an <br />optimal time schedule can be better. <br />The recycling factor that results from the combination of surface <br />diversions and groundwater pumping may also be a significant advantage <br />of an improved groundwa ter recharge system. Under present condi t ions, <br />the annual native, supply in the South Platte, as previously noted, is <br />approximatelY 1.44 MAF. Yet the total of surface water diversions is <br />about 2.5 times that amount indicating the importance of groundwater <br />return flow into the river. While the factor 2.5 is an impressive <br />number, it is quite likely that an expanded recharge system could <br />increase that number substantially. <br />The expedient rule of 5 percent augmentation can be substantially <br />refined with modern computer simulation technology now available. With <br />the new computer model SAMSON, the timing and the location of stream <br />withdrawals into groundwater and groundwater return flow into the stream <br />can be determined. Furthermore, these determinations can be done on a <br />day-to-day basis. . The exact effect on surface flow for any one well or <br />for any group of wells can be calculated. With this information the <br />appropriate augmentation plan for an individual well or groups of wells <br />can be formulated. Further, the amount, timing and location of augmen- <br />tation due the river can be calculated on a day-to-day basi s. <br />Development of SAMSON, together with MODSIM, are two significant <br />steps which have been taken at CSU in the development of advanced <br />technologies leading toward voluntary integrated basinwide water <br />management. With reliable quantitative daily information on pumping <br />