Abstract
One of the main objectives of research in hydrology is to improve the accuracy of catchment storage estimation for water resources management and flood prediction purposes. Rain water falling to the ground surface will either run off along the surface or infiltrate into the soil. The infiltrated water which is defined as loss rainfall can be used to estimate the potential catchment storage.
Total rainfall-total loss rainfall relationship has been developed to estimate catchment storage by using tanh function fitting curve for 47 catchments located in 16 prefectures in Japan between 2002 and 2011 (June to October). The obtained results indicate that runoff parameters in the tanh function represented by a and b parameters can be utilized to estimate the potential water storage for catchments having stabilized tanh curve type. Among 47 catchments, only 23.4% of the overall catchments have stabilized tanh curve types which are located in Honshu Island.
