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<br />tit <br /> <br />route some of the flow into a different watershed. <br /> <br />Effect of Development <br /> <br />When buildings are placed in the flow path of flowing water, the buildings reduce the width <br />available to pass the flow and cause the water surface elevation to increase. This increase <br />in water surface elevation may be localized and only effect the area where the buildings <br />are located, but this increase in water surface elevation can also expand and effect areas <br />upstream of the buildings, downstream of the buildings, and adjacent to the buildings. It <br />is apparent by comparing Figures 3 and 4 that a new development can have a significant <br />effect of the depth of flow that a neighboring development encounters during a mudflow <br />event. <br /> <br />CONCLUSION <br /> <br />e It appears that FLO-2D could be an important tool for the City of Aspen to identify "high <br />risk" areas that may be subject to flooding and/or mudflows. By accounting for and <br />modeling the sediment that a large runoff event may convey, the water surface elevation <br />of the flood event can increase significantly. The FLO-2D modeling also demonstrates the <br />effect that new developments may have on the depth of flow of the runoff on themselves <br />and their neighbors. <br /> <br />After further refinements, the FLO-2D model will be used to design mitigation measures <br />for the City of Aspen to control possible flooding and mudflow events. The model will also <br />be used to plan and design new developments to minimize the effect that they will have <br />on neighboring properties. As new development modifies the shape of the base of the <br />mountain, the FLO-2D model will be altered to account for these changes, so the current <br />model will always be representative of the existing conditions on the mountain. <br /> <br />e <br />