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<br />O~1614 <br /> <br />. <br /> <br />This supplement to Appendix A, April 1961, sets forth the <br />revIsions necessituted by the modifications, develops the resulting <br />hydrologic effects and provides the framework for relating the <br />economic evaluation to the water-supply. <br /> <br />A modified operation study was developed to show water supply <br />available to each ditch with the project operating under these new <br />criteria. The purpose of this "Supplement" is to present and explain <br />the modified or supplemental study. Results of the supplementa: <br />study have been used to compute payment capacity indexes for each <br />ditch--see Appendix B, Agricultural Economics. <br /> <br />Total project diversion found in the supplemental study was <br />virtually equivalent to the Appendix A values. Therefore the <br />Appendix A evaluations for return flow and effect on John Martin <br />Reservoir are still appropriate. <br /> <br />The supplemental studies were placed on a calendar year basis, <br />while Appendix A studies are on a water year basis. This should be <br />kept in mind for all comparisons of the studies. Table 1 shows the <br />acreage served by each ditch and its percentage of the total subarea <br />acreage. <br /> <br />. <br /> <br />Table l.--Percentages used for determination <br />of individual ditch requirements <br /> <br />Subarea <br /> <br />Trinidad <br />to <br />Hoehne <br /> <br />Model <br /> <br />Hoehne <br />to <br />Alfalfa <br /> <br />Ditch Acres Percent <br />Baca 2,428 19.2 <br />Chilili 114 0.9 <br />South Side 6,381 50.3 <br />El Mora 160 1.2 <br />Johns Flood 2,076 16.4 <br />Hoehne 1,520 12.0 <br /> - <br />Total 12,679 100.0 <br />Model 6,177 100.0 <br />Burns-Duncan 322 37.4 <br />Lewelling-McCormick 378 43.9 <br />Salas 161 18.7 <br />Total 861 100.0 <br />Total (all ditches) 19,717 <br /> <br />. <br /> <br />2 <br />