Use of Lysimetric Measurements for Designing Major Irrigation Systems in the USSRby Oleg A. Leontyev, SOVINTERVOD Water Engineering Co, Moscow, Russia,
Abstract: The bioclimatic method for calculation of crop water requirements has been widely used in the USSR in recent years. The author has analyzed the results of its application for designing major irrigation systems. Proceeding from the results of his own research, the author suggests the finite formula used in this method when it is applied for estimation of moisture deficit in the root layer for each day of the vegetation period. The main task to be solved at the stage of pre-design studies for a major irrigation project is determination of the total irrigation demand. That figure is necessary for calculation of the required discharge capacity of irrigation network and structures. Also, knowledge of the total irrigation demand is necessary for prediction of the effect of irrigation on: soil fertility, crop yieldability, environment, the ecological balance in an area under study, etc.
Subject Headings: Irrigation systems | Crops | Hydraulic design | Water resources | Vegetation | Soil water | Evapotranspiration
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