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<br />Sc gradient of the main stream channel (feet per mile) <br /> <br />Vj V2 <br /> <br />area of pre-urban and post-urban land use respectively (square <br />miles); correspond to 1952 and 1972 land use maps in develop- <br />ment of the model <br /> <br />X mean annual flood (see Qrna) <br /> <br />a intercept of the Gumbel line; confidence level <br /> <br />. <br /> <br />e slope of the Gumbel line <br /> <br />~Qn change in the n-year flood expectancy <br />~L total length of stream channels in a watershed <br /> <br />~ <br /> <br />x <br />