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<br />Mudflows present an even more ,;omplex problem. The exceedance <br />probability for a given mudflow event is dependent on several <br />factors including the rainfall probability, the availability of <br />source material, antecedent moisture conditions, bank or slope <br />stability, and the sediment size distribution of the fluid matrix. <br />Obviously, the estimation of a mudflow discharge frequency will <br />require several broad assumptions" In the absence of other <br />reliable data, the mudflow peak discharge frequency can be <br />determined using rainfall/runoff modeling and the associated <br />rainfall exceedance probability. It should be understood however, <br />that not every rainfall of a certain frequency will produce a <br />mudflow or conversely that mudflO101S may occur even during <br />relatively light rainfall events if the right antecedent moisture <br />conditions exist. <br /> <br />9 <br />