INFILTRATION-ADVANCE EQUATION FOR RADIAL SPREADING

Volume balance and flow rate considerations were used to develop an eq uation for the radial rate of advance of irrigation water. The equatio n is applicable to radial flow from bubblers, sources near the edge of a basin, or other situations in which the primary flow direction is r adial from the source. Examples are given for the use of the equation in designing the spatial and temporal characteristics of an applied sl ug of water. A technique is presented to allow equations associated wi th previous strip irrigation analyses to be transformed for use in rad ial irrigation analyses.