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Subpart A - General <br />Part 683 - Water Requirements <br />SUBPART A -- GENERAL <br />C0683.2(a) (1) <br />00683.1 Net irrigation water requirement. <br />(a) The net irrigation water requirement is defined as the <br />water supplied by irrigation to satisfy evapotranspiration, <br />leaching and miscellaneous water requirements that are not <br />provided by water stored in the soil and precipitation that <br />enters the soil. Precipitation that drains through a-soil-is not <br />effective unless it reduces the leaching requirement. The <br />irrigation requirement is defined as: <br />Wr=Wet+W1+Wm-Re-Ws, <br />Where <br />Re <br />Ws. <br />C0683.2 <br />(a) <br />Wr - irrigation water requirement for the period <br />considered. <br />Wet <br />Wi - <br />Wm <br />evapotranspiration; the quantity of water required <br />for transpiration or building of plant tissue and <br />evaporation from the soil and interception of <br />precipitation during"a specific period of time. <br />leaching requirement; the quantity of water <br />required to remove soluble salts from the root zone <br />by the downward passage of water. <br />miscellaneous water requirements; the quantity of <br />water used to aid in germination and emergence of <br />small seeds, to prevent frost damage to crops and <br />for plant cooling. <br />effective rainfall. <br />the decrease in soil water that can be utilized <br />during the period. <br />Consumptive use and methodology. <br />General Methodology. r <br />(1) Consumptive use of water or evapotranspiration is one <br />of the important elements of the hydrological cycle from the time <br />water falls upon the land as precipitation until it reaches the <br />ocean or is returned to the atmosphere. <br />C0683-1 <br />(C0210-VI-COIG, December 1988)