Abstract
A deterministic computer model was developed to simulate runoff, on an hourly basis, from agricultural lands with surface and subsurface drainage. The model simulates the major hydrologic and hydraulic processes occurring both above and below the soil surface. The theoretical concepts of the algorithms are described. The model was tested on two fields, one with subsurface drainage and the other with surface drainage only. Simulated hydrographs were compared with measured hydrographs during the 1985 growing season. The results showed that the model performed reasonably well. There was no difference between the measured and simulated parameters of peak discharge, runoff depth and time of peak discharge at the 0.05 level of significance.
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