Effect of Rainfall on Hydraulic Resistance of Shallow Flow

The hydraulic resistance of shallow water flow under the influence of rainfall has been investigated through the flume experiment with artificial rainfall. The effect of rainfall on the flow characteristics of shallow water has been analysed,the concepture of "False-laminar flow" has been suggested,and the formula of Darcy-weisbach resistance coefficient has been eastablished. The results of the study can be used in overland flow routing and soil erosion simulation.