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<br />I. INTRODUCTION <br />This document presents the technical background to support the two' <br />dimensiDnal, hyperconcentrated sediment flownrouting model entit'led, MUDFLOW, <br />Th is multifaceted computer mode 1 was des i gned to route water fl oods, mud fl oods, <br />and especially mud flows, often a predominant flooding condition over an <br />unconfined flow path, Dn an alluvial fan. The model can simulate clear,water <br />fl ows or very vi scous mud fl ows in channels and overland on fl ood p 1 ai ns or <br />alluvial fans, <br />Overland flow is modeled by a two,dimens'ional, diffusive wave apprDximation <br />of the momentum equation. Channel flow is modE!led one,d-imensionally using either <br />the diffusivE! or kinematic wave approximation of the complete momentum equation_ 4i' <br />The MUDFLOW model can simulate supercritical and subcritical flow and backwater <br />effects from constrictions and bridges. Overbank channel flooding and return <br />flow to a channel can also be modeled. <br />Presented in this report is a derivation of the constitutive equations, <br />a description of numerical scheme, and discussion of the development of the <br />equations for simulating hyperconcentration sediment flows. Also discussed are <br />the data requirements, input data format, options for printing results, and a <br />suggested procedure for application of the model. A typical example of input <br />to and output from the MUD FLOW model is presented in Appendix A, <br /> <br />1.1 <br />