Determination of infiltration-capacity for large drainage-basins

Introduction-synopsis—This paper describes a method which may be used for determining the average infiltration-capacity over a drainage-basin during large storms where a runoff-record, together with adequate rainfall-data, are available. The application of the method requires that in each drainage-basin there shall be at least one rain-intensity record kept with a recording rain-gage. The method is based on the observed fact that in great general storms, while there may be two or more different types of rain-intensity graphs in different parts of the storm-area, locally the rain-intensity graphs are statistically very much alike.