Laserfiche WebLink
<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />2485 <br /> <br />Availability of crop coefficients for the method and area <br />Knowledge of expected ET levels based upon local information or <br />water use production functions <br /> <br />Alfalfa evapotranspiration estimates were made for several areas in <br /> <br />the western United States using seven different equations ~/. For a <br />general comparison, their data are reproduced in Table A-l.4. <br /> <br />1.4 APPLICATION TO PROJECT AREA <br />1.4.1 General <br />The 8 methods described are applied to the Fort Lewis area for <br />comparative purposes. Data which were not available from the Fort <br />Lewis weather station were estimated using data from other stations <br /> <br />in southwest Colorado or Farmington, New Mexico. Comparisons <br /> <br />cannot be made on a reference crop basis unless all methods use the <br /> <br />same reference crop (alfalfa or grass). For this reason, <br /> <br />appropriate crop factors are applied to use for purposes of alfalfa <br />comparison. <br /> <br />Assumptions have been made for several factors impacting consumptive <br /> <br /> <br />use. These factors do not generally affect the utility of their <br /> <br /> <br />application for comparative purposes and selection of appropriate <br /> <br /> <br />methodology. Some of these assumptions include the following: <br /> <br />o The growing season is assumed to extend from the first of May to <br /> <br />the middle of October, and the irrigation season is assumed to <br /> <br />1- 22 <br />