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Management Allowed Depletion (MAD) <br />Management allowed depletion is the maximum amount of water that is allowed to be depleted from the <br />soil root zone without any perceived stress in the crop. <br />Mean Crop Coefficients (Kcm) <br />Mean crop coefficients include wet soil effects after rain or irrigation on crop consumptive use, such as <br />soil drying properties. <br />Reference Crop Evapotranspiration (Ref ET) <br />Reference crop evapotranspiration is the rate at which water, if readily available, would be removed from <br />the soil and plant surface expressed as the depth of water evaporated and transpired from a reference <br />crop such as grass (ETo) or alfalfa (ETr). <br />Surface Runoff (Ro) <br />Surface runoff is the quantity of precipitation or irrigation water that does not enter the soil profile (water <br />in excess of infiltration rates) and therefore is not available to crops. This water is transported to surface <br />water features such as rivers or streams. <br />Transpiration (Trans) <br />Transpiration is the process by which water in plants is transferred as vapor into the air. <br />Permanent Wilting Point (PWP) <br />The permanent wilting point is the moisture percentage, also on a dry weight basis, at which plants can <br />no longer obtain sufficient moisture to satisfy moisture requirements and will wilt permanently unless <br />moisture is added to the soil profile. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />It is recommended that these definitions be adopted for the CRDSS. <br />4 <br />A275 01.09.95 1.14-8 CSU IDS <br />