Study on drainage modulus calculation method of diked area;

Based on the rainfall-runoff relationship in small watershed with different lower-lying condition,and by means of Nash s instantaneous unit curve method,the drainage modulus has been analyzed and the calculation method of drainage discharge has been presented in the study.

The calculation method of drainage modulus in agricultural diked area is inapplicable in urban diked area.

Study on drainage modulus calculated with short-term stopping storage method in waterlogging region;

The calculation process of farmland drainage modulus was proposed on the basic of salt equilibrium.

This paper described different methods of calculating drainage modulus, gave the process of calculating drainage modulus of waterlogged farmland with short-term storage suspension method, and proved the method with a case.

The designed flood drainage modulus was determined by calculating the flow hydrograph,and the mathematical model for calculation of designed flood drainage modulus was analyzed based on condition of low-lying region in Taihu Lake basin.

In order to determine the flood drainage modulus in dike regions of river networks in South Jiangsu,check the drainage capacity and provide the bases for drainage planning,the modeling method by using BP neural network is put forward on the basis of the conventional adjusting and storing computation.

This article takes a low-lying region in shanghai as background,aims at the compartmentalization problem of time interval in the actual calculation,studies the impact of different time interval on the designed flood drainage modulus,elicits a conclusion that the designed flood drainage modulus increases along with the increased time interval within a certain scope,and analyses.