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<br />/ 5 / <br />I <br />, I <br /> <br />/ 3~1.6/ Grid representation of topo- <br />I graphy (elevations). . <br /> <br />/ 3~5.0/ <br />I <br />I <br />I <br />I <br />I <br />/ 12A / Grid representation of Damage <br />I '.," Reach Boundary. <br />I <br />/ A / <br /> <br />Domalle Reach <br /> <br /> <br />Typical Grid Cell <br />in Reach <br /> <br />I ndex Loco t Ian for <br />Damage Reach <br /> <br />DATA REQUIRED <br /> <br />Grid representation of land use <br />(exhaustive for study area). <br /> <br />Grid representation of reference <br />flood (water surface elevation <br />at reference flood) for each grid <br />cell. <br /> <br />Composite stage-damage functions <br />for each significant land use. <br /> <br />INDEX LOCATION DAMAGE FUNCTION CONSTRUCTION <br /> <br />STEP 1 J Develop Elevation - damage Function at Each Cell <br /> <br />a. Determine land use from grid file <br />b. Retrieve appropriate composite stage damage function <br />c. Determine grid elevation of cell from grid file <br />d. Tabulate elevation-damage for cell from above <br /> <br />STEP 2, Aggregate Cells to Index Location <br /> <br />a. Determine cell damage reach assignment <br />b. Determine index location reference flood elevation (Xl) <br />c. Determine cell reference flood elevation (X2) <br />d. Adjust cel,-e]evatian-damage function by (X2-Xl) <br />e. Aggregate cell adjusted elevation-damage function at index station <br />f. Repeat for all grid cells <br /> <br />FIG. 3.--Damage Function Development (1). <br /> <br />,p <br />