Abstract
A surface flow model utilizing the kinematic wave theory was applied to a third-order stream system which represented conditions in Williamson and Johnson Counties, Illinois. The model drainage basin was considered as a distributed hydrologic system with the stream network, channel characteristics and overland flow lengths as distributed hydrologic variables. Different order channel lengths, channel cross-sections and channel slopes were treated as spatially distributed. The results of the hydrologic response of the model small agricultural drainage basin showed that various time parameters are affected by change in rainfall-excess intensity. The peak flow rates for a given rainfall-excess duration showed a nonlinear response with the rainfall-excess intensities. The base or time duration of a direct run-off hydrograph increased with an increase in rainfall-excess intensity and duration.
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