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`~ 1 identified. However, depletion resulting from water-surface evaporation will, as it has been historically, be accounted ' for as a reduction in tributary groundwater inflow. Rates of depletion for different land-use categories are summarized in the first column of Table 1, and represent gross evaporative losses irrespective of precipitation amounts. Depletion rates from irrigated cropland are calculated with the assumption that the total moisture needs of the crop are satisfied by the use of irrigation water to supplement natural precipitation. 3•LEGAL CONSIDERATIONS Although floodwaters of the South Platte River occassion- ally leave Colorado in excess of compact committments to Ne- ' braska, on average the resources of the watershed are complete- ly utilized within the State of Colorado. As a result, addi- ' tional depletions of the water supply are not only contested by other water users but generally are not allowed either by ' the Division of Vlater Resources or by the Courts. i A consequence of this criterion is that land-use and water- resource planning for the proposed gravel operation must be co- ordinated such that depletions resulting from the future con- ' figuration of the hydrologic system do not exceed the historic depletion. The necessary balance can be achieved~in either of two ways: i ' a• On-site balance. A balance may be obtained on the specific parcel provided that the exposed pond area after mining is lim- ' ited in extent by evaporation-loss criteria. One possible com- bination of land areas which would provide a local hydrologic i ' balance is shown in the last two columns of Table 1, and indi- cates that no more than 59 acres may remain in open water sur- ' face. Other combinations are possible including irrigated open space, some of which may require fill material. However, present plans include a lake of only 51 acres in surface area, so ' that the fill alternative may not require further consideration. (2)