The Discuss of the Formula of Flow Loss and Water Using Coefficient on Seepage Proofed Channel

On the basis of the analysis about present water resource situation in China,the disadvantage of the formula of low loss and water using coefficient on anti-seep channel which have been applying in channel design and water saving irrigation administration will be indicated in the paper.The characteristics of that the loss of conveying water is changeable with the flow changing have been take into account in the new formula.The formula is validated by the example of middle permeable channel(A=1.90,m=0.40).The calculate result is more precision.Also some formula has been given,they can be referred to the worker of the irrigation administration.