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<br />.. ' <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />IJliHU5 <br /> <br />Task 1.14 - Evaluation of Consumptive Use Models <br /> <br />Leachinl! ReQuirement (LR) <br /> <br />Leaching requirement is the fraction of water entering the soil that must pass through the <br />root zone in order to prevent soil salinity from exceeding a specific value. <br /> <br />Mana!!ement Allowed Deoletion (MAD) <br /> <br />Management allowed depletion is the maximum amount of water that is allowed to be <br />depleted from the soil root zone without any perceived stress in the crop. <br /> <br />Mean Croo Coefficients (Kcm) <br /> <br />Mean crop coefficients include wet soil effects after rain or irrigation on crop consumptive <br />use, such as soil drying properties. <br /> <br />Reference CroP Evapotranspiration (Ref Ell <br /> <br />Reference crop evapotranspiration is the rate at which water, if readily available, would be <br />removed from the soil and plant surface expressed as the depth of water evaporated and <br />transpired from a reference-crop such as grass (ETo) or alfalfa (ETr). <br /> <br />Surface Runoff (Ro) <br /> <br />Surface runoff is the quantity of precipitation or irrigation water that does not enter the soil <br />profile (water in excess of infiltration rates) and therefore is not available to crops. This <br />water is transported to surface water features such as rivers or streams. <br /> <br />Transpiration !Trans) <br />Transpiration is the process by which water in plants is transferred as vapor into the air. <br /> <br />Permanent Wiltin!! Point (PWP) <br /> <br />The permanent wilting point is the moisture percentage, also on a dry weight basis, at <br />which plants can no longer obtain sufficient moisture to satisfy moisture requirements and <br />will wilt permanently unless moisture is added to the soil profile. <br /> <br />3.0 Conclusions and Recommendations <br />To adopt these definitions for CRDSS, <br /> <br />10/6/94 - CU Model Terms (1,14-8) <br /> <br />4 <br /> <br />IDS Group, CSU <br />