The method is recommended for rural watersheds where observations indicate a long hydrograph recession limb. The Williams formula for Tp is not recommended in Ontario as it has been shown to give significant errors.


WILLIAMS IUH

As is predecessor (INTERHYMO / OTTHYMO.89), Visual OTTHYMO does not recommend de-fault values for K and Tp in the Williams command, since it is considered that this IUH requires calibration.


COMPARISON OF WILLIAMS AND NASH IUH

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