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<br />e. <br /> <br />. <br /> <br />.. <br /> <br />conveyance loss and on-farm application efficiency would provide a oomputaticn <br />of the amount of the total COD81.IIliltive use _t by sudace supplies. The <br />variables of conveyance loss, cn-fa= efficiency, and the Ilplit bet_en Ilurface <br />runoff and deep percolation would be "adabl.. that could be adjusted in a <br />calibration process. The difference bet_en the total consUlllptive Use and the <br />amount of conllUlllptiv8 use met by surface supplies is the consUlllptive use of <br />groundwater. <br /> <br />A groundvater IIlOdule would have tWO options. The first would be a <br />computation of stream depletion by the SDP procedure. Well 10<:&tiOl:ls would be <br />a.signed an SDP value by the distributive capabilities of GIS which combined <br />with the vell's CO of groundwater would be inputed to an SDP routine which <br />computes a hydrograph of stream depletions. These stream depletions could be <br />totaled for a given ditch system or a given river reach. <br /> <br />The second option would utilize a finite difference groundwater model such <br />as Visual Hodflov. The above water balance computations would provide input. to <br />Modflow and Clllibration would take place by comparing water leyels and/or flows <br />at stream gages. Por each of the gridS of Modflow, the water balance <br />computation for a given landowner would provide the deep percolation or recharge <br />that the aquiter has historically received. <br /> <br />Two example case. could be tested. These would be (1) the Boxelder Basin <br />which is an illlPortant area at' augmentation for the CCWCD and (2) the Julesburg <br />Irrigation District in the lower South Platte Basin (ie, from about Crook, 00 to <br />the statelinel which is an important a;cea of well aUgDlentation, COIIlpact issues, <br />and future conjunctive ulle development of water credits in a Platte Basin <br />Endangered S~ch. Recovery Program. <br /> <br />A useful product of this South Pl.tte GIS effort would be a color map <br />Combining different GIS databases (property boundaries, field layout, crop type) <br />that could be sent to landowners for tMir verification and additional <br />clarification on such items as pattern' of surface runoff on to or off of their <br />fa=s or locations of tailwater pondll or seep areall. <br />