Method for calculating seepage losses from earth-lined irrigation channels based on point cumulative infiltration

Based upon the point experinents on pressure infiltration processes in an unsaturated earth-liled channel an empiricahnodel for calculating seepage losses from earth-liled irrigation channels is developed.The parameters of model are empirically correlated with thewater depth in the channel.The seepage bss is estin ated through integrating the cunulative infiltration along the channelwetted perineter.Themodel is validatedwith the experinentaldata.The result shows that themodelcan has abetterperfomanceon seepage loss estination than dlatofusing the Kostiakov infiltration modlel that is also anpirically based.The sinulated seepage bss process using themodel agrees well with the observation, which demonstrafes the feasility ofusilg the point cumulative ilfiltration approach to calculate seepage losses from earth-lined irrigation channels.