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<br />2.6 Assessment Qi Damaae Risk Qll Fans <br /> <br />~ <br /> <br />1. Curves relating flood depth and velocity to approximate <br />damages to structures have been developed. The fIA riverine <br />curves were used as a basis and modified to incorporate the <br />effects of velocity and sediment transport. <br /> <br />2. The damage curves can be used with stage/ velocity/ <br />frequency curves to roughly assess the expected annual flood <br />damages on a fan. Due to the, at present, limited <br />understanding of fan flood dynamics and the high variabi1ity <br />of flood behavior on fans. flood damag~s obtained in this <br />way should be used only as rough estimates of risk. <br /> <br />3. Damages at given depths are substantially higher on fans <br />than, in riverine floods, due to scour, sediment .deposition. <br />and impact forces on structures. <br /> <br />2.7 AS$essment Qi Manaqement 1QQl Impacts <br /> <br />1. Matrices were created to delineate the types of <br />environmental, social. economic, and inflationary impacts <br />which may result from the application of the various <br />management tools. The direction and significance of each <br />impact are indicated along with whether the impact is <br />temporary or permanent. <br /> <br />2. The matrices are general in that they apply to all fans. <br />However, specific fan situations may incur significantly <br />different impacts. <br /> <br />3. Whole-fan, structural measures have the most significant <br />economic and environmental impacts, both positive and <br /> <br />22 <br />