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and watershed charateristics and to provide case studies of flood plain management tool applications in existing communities. A program of physical model studies was developed to provide (1) quantitative data on flood behavior. including depth, velocity. and sediment transport rates; (2) qualitative and quantitative relationships between fan and watershed conditions and flood processes; (3) models of flood plain management tool applications and operations; and (4) analyses of the effectiveness of such tools. Physical model studies were selected as the only viable short-term means for investigating phenomena which have only been cursorily documented in the field. As discussed in Part II. Section 2 of this report. such use is justified despite a recognized lack of data suitable for model verification. Physical models have. in the past. been used successfully to study complex. hydraulici, fluid mechanics, and sedimentation p,oblems where no analytic or field data was available. Many theories about erosion. sed iment transport and rive. mechanics have been developed based on physical model studies and such studies have proven to be essential to the improvement of our understanding of the responses of complex natural systems. Care has been taken to verify each model used in the present study. wherever possible. against observed flood behavior. One model was designed to be a scale replica of an actual fan and the results of prototype flood simulations were compared with field observations of a historical flood. Comparisons between model behavior and hydraulic principles were made to verify the reasonableness of the results. As an adjunct to the study of fan flood processes and management tool effectiveness. analyses of management tool environmental, social. economic. and inflationary impacts 11