Abstract
An analytically derived frequency distribution is reported to determine the probability of occurrence of solids washoff in different amounts from impervious urban areas. Also an expression is derived for the expectation of annual solids washoff. The resulting expressions contain several basin parameters related to land‐use practices. These parameters can be obtained from local data on storm runoff quality associated with only a few storms. Detailed historical rainfall data is needed since the joint probability density function of rainfall depth and time period between two storms should be known to apply the proposed approach. The use of the derived frequency is illustrated by a sample application.
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