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<br />. <br /> <br />'~~ <br /> <br />- - i <br /> <br />APPENDIX - D-2 (~) <br /> <br />Input Data to Depleti,on Computations <br /> <br />The water consumption of irrigated agricultural crops on the area was <br />estimated by the Nodified Blaney-Criddle Hethod as ,it is described in <br />Technical Release No. 21 of the Soil Conservation Service. <br /> <br />The climatological data used for the irri.gation-requirement computation <br />were obtained from published Weather Bureau SQ,urces for Pueblo, Rocky Ford, <br />La Junta, Las Animas and Lamar. An analysis Qif this data revealed that a <br />division of the Arkansas Valley into an upper and a lower reach is justified <br />e from the standpoint of climatology. Climatological data, for the upper part <br />of the valley was established as the average of the data collected at Pueblo <br />and Rocky Ford; and for the lower basin, as th.e a,:,,~rage of the data collected <br />at La Junta, Las Animas and Lamar. The specific climatological data used <br />were average monthly precipitation, average monthly temperature and the <br />average dates of last frost in the spring and first frost in the fall. Normal <br />Weather Bureau data; i.e." long-term averages, were used. <br /> <br />e <br /> <br />Monthly irrigation requirements were then figured for the typical crop <br />composition. of the valley.. This irrigation requirement represents actual <br />crop consumption, taking into account a portion of the rainfall which is <br />available to the crops as effective precipitation. The results of this <br />calculation was the actual crop consumption by month for the subareas con- <br />sidered. <br />