This paper presents a statistical correlation procedure to predict a master depletion curve by use of basin characteristics and the specific storage of water available for runoff at a particular recession discharge in small watersheds. Percentual lake area, drainage density and a weighted lake inflow area index are the most significant parameters to explain differences in specific storage among basins. The significance shows time-dependency. Percentual lake area has a decreasing contribution to a total explanation from high to low specific discharges, while drainage density increases its importance.

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A procedure to isolate and investigate the watershed influence on storm runoff is presented. It offers an opportunity to study also the change in influence of particular watershed characteristics by changing the input or soil moisture state of each catchment. Weighted lake area, area of bare rocks, main stream gradient, drainage density and basin area are found to be the most significant characteristics in affecting peak runoff and time of rise on storm hydrographs in small Norwegian rivers. The intercorrelation structure of the watershed properties is examined.