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<br />OU2497 <br /> <br />., <br /> <br />. <br /> <br />conveyance lo.e anl1 on-farm application efficiency ..oull1 preville a CCIIlputation <br />of the &IIlCl\Int of the total con.umpti ve uee ..t by eurtace .upplie.. The <br />variablee of! conveyance loa., on-fazm efficiency, and the aplit between .urtace <br />runoff and deep percolation would be variablea that coull1 be adjueted in a <br />calibration proc:eee. The difference between the total con8U1l1Ptive uee and the <br />-.>unt of cona\.lq)tive u.e met by aurface euppl!ea ia tl1e CQD8uq>tive uae of <br />grounl1water. <br /> <br />A groundwater IIlOdule would have two optioa.. ~ firet would. be a <br />cOlllputation of etream depletion by the SDP procedure. Well location8 would be <br />asaigned an SDP value by the distributive capabilitie8 of GIS which combined <br />with the well'e CO of grounc!water would. be inpute" to en SOP routine which <br />ccmputee a hydrograph of etrelllll 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 Modflow. The above water balance computations would provide input. to <br />MOdflow and calibration would take place by comparing vater levels and/or flows <br />at stream gages. Por each of the grids of Modflov, the water balance <br />computation for a given landovner would provide the deep percolation or recharge <br />that the aquifer has historically received. <br /> <br />. <br /> <br />Two exaJllPle casea could be tested. These would be (1) the Boxelder Basin <br />which is an illlportant area of augmentation for the CCWCO and (2) the Julesburg <br />Irrigation District in the lower South Platte Baain (ie, from about Crook, 00 to <br />the stateline) which is an iJDportant area of well augmentation, canpact issues, <br />and future conjunctive uae development of water credits in a Platte Basin <br />lInc!aJ:lgered Specie. llecovery progr..... <br /> <br />A useful product of this South Platte GIS effort would be a color map <br />combining different GIS database. (property boundarie., field layout, crop type) <br />that could be sent to landowners for their verification and additional <br />clarification on such items as patterns of surface runoff on to or off of their <br />f&r1lls or locations of tailwster pond" or "eep are... <br /> <br />. <br />