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<br />I. INTRODUCTION <br /> <br />The principal objective of the investigation reported herein was to <br />provide advice and guidance to the Federal Emergency Management Agency (FEMA) <br />concerning the capabilities, limitations, and applicability of available <br />computer models for erodible-bed rivers to flood events, with the goal of <br />improving flood-insurance studies conducted under the National Flood Insurance <br />Program (NFIP). Descriptions of the Committee that was convened and the <br />organizational aspects of the project are presented in the PREFACE. the <br />early stages of the study, a nationwide canvass of river experts was made by <br />the Committee to identify modelers who had developed usable, alluvial-river- <br />flow models. Although the Committee was aware of the several alluvial-river- <br />flow models, developed in Europe and elsewhere, such as those of the Danish <br />Hydraulic Institute in Denmark; Delft Hydraulics Laboratory in the <br />Netherlands, Sogreah in France; and Hydraulics Research Station of <br />Wallingford, England, a decision was made to limit the study to models that <br />had been developed in the USA. This decision was dictated primarily by the <br />time and budgetary constraints of this study. From among the several modelers <br />identified, four agreed to participate in the project: Hydrologic Engineering <br />Center, Corps of Engineers (HEC); Resource Management Associates (RMA); San <br />Diego State University (SDSU); and Simons, Li & Associates, Inc. (SLA). A <br />total of six numerical models was selected by the Committee members: three <br />from SLA, and one from each of the other organizations. The characteristics <br />of the models are summarized in Chapter II. Chapter III presents background <br />on the selection of the three study rivers (the San Lorenzo River (SLR); the <br />San Dieguito River (SDR); and the Salt River (SR)), and describes the <br />characteri st i cs of the ri vers and the input data utili zed for each. The <br />principal numerical results obtained by each modeler are summarized in Chapter <br />IV. Chapter V describes the limitations of the alluvial-river-flow models, <br />and the prinCipal conclusions and recommendations arrived at by the Committee <br />are summarized in Chapter VI. <br /> <br />1 <br />