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. 00lJ.?f\ 3. Terms with commonly accepted technical meanings: conveyance loss - That portion of a diversion that does not reach the crop area due to evaporation, seepage, and/or spills from the ditch system, sometimes called carriage water. Diversions - conveyance loss = farm delivery. deep percolation - The downward movement of infiltrated water below the vegetation root zone, eventually reaching the water table. Deep percolation may enter tributary or non-tributary aquifers depending on geology of an area. depletion - evaporation - The net reduction to stream flow caused by the consumptive use of an activity, and after accounting for return flows. The process by which liquid water becomes vapor and enters the atmosphere. evapotranspiration (ET) - The combination of evaporation from soil and water surfaces and plant transpiration that occurs on a vegetated area. Equivalent to consumptive use. farm delivery - infiltration - phreatophyte - root zone - salt balance - soil moisture - The portion of a diversion which reaches the farm field and is applied for crop use. The process by which surface water enters the soil profile. Deep rooted plant which consumes water from the water table. Examples include willows, cottonwood, and salt cedar. That portion of the soil profile from which crops can withdraw water through their roots. The depth of the root zone varies with vegetation types. Maintaining the salt concentration in the root zone at an acceptable level by flushing the salt added to the soil with irrigation water out of the root zone. Accomplished by applying an amount of water above crop needs and causing intentional deep percolation. the percent by weight of water in a unit of soil, that will not freely drain out of the soil under the force of gravity. 3