Based on the concept of uniform nonlinearity (Dooge, 1967) a hydrologic cascade is formulated for prediction of surface runoff. By applying it to several natural agricultural watersheds its predictive ability is evaluated. The cascade contains three parameters. Utilizing watershed morphology equations are developed to estimate these parameters. The results of the model application to natural watersheds suggest that the model parameters can be reliably estimated. This cascade model seems to be a compromise between simple linear and complex nonlinear surface runoff models.

Project No. 3109-206