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26 I I I I I I I I I I I I I I I I I I I 056~ available water, and reduce irrigation induced erosion to acceptable limits. Development of tillage, planting, and irrigation e~during and management practices specifically for the Limestone-Graveyard Creeks Watershed area conditions and development of a bet~er understanding of nutrient, heavy metals and salinity management hold considerable potential for reducing heavy metals, nutrients and salinity damages. From the conservation practices in the NRCS Field Office Technical Guide, a list of practices was developed. Combining the practices in various ways, alternative solutions, with varying costs and impacts, were formulated. The formulation process, evaluation and comparison of alternatives, and the rationale for plan selection are presented in the following sections. Appendix C contains water budget information for t~e various alternatives considered. A detailed discussion of alternative analyses are presented in this appendix. Analyses were carried out for, curren~ irrigation management activities, a static irrigation set time, a system based on crop needs, and a surge irrigation system tied to crop needs. Data indicates that soil moisture depletion does not exceed 50 percent. Therefore it was concluded from the analyses that deep percolation could be reduced significantly with system and management changes without increasing crop consumptive use Hanks (1974) and Ritchie (1973). This reduction in deep percolation will reduce ground water pollution from selenium leaching, the problem for which the project has been formulated. The total quantity of Arkansas River water reaching the Kansas border is not anticipated to change with project implementation. Each alternative solution was considered using four criteria: - Completeness (extent the alternative provides and accounts for all necessary investments or other actions to ensure the realization of the planned effects) - Effectivenesa (extent to which the alternative alleviates the problems and achieves the specified opportunities) - Efficiency (extent to which the alternative is the most cost effective means of alleviating the specified problems and realizing the specified opportunities) - Acceptability (extent to which the alternative is acceptable to State, local entities, and the public) . Civil rights issues were considered during alternative formulation.