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<br />p~otection eXlsts, options for the new st~uctu~e a~e <br />limited. Elevation on piles should be used unless it can be <br />shown that no additional flood damages to existing <br />str~ctu~es will ~esult f~om const~uction of othe~ tools <br />(e.g., local dikes o~ elevation on a~mo~ed fill), <br />Simila~ly, subdivisions must be const~ucted such that no <br />added flood damages to existing p~ope~ty ~esult. <br /> <br />state-Of-The-A~t ~ Flood Analysis ~ Fans <br /> <br />Conside~ably more ~esea~ch, including field studies of fans <br />and flood events in pr09~ess, will be ~equi~ed to develop a <br />haza~d quantification methodology which ~ep~esents the flood <br />p~o~esses discussed in Section 4. physical modeling ~esults <br />(see Pa~t II, Section 3) p~ovide conside~able insight into <br />these p~ocesses and allow the development of tentative <br />empirical ~elations fo~ fan flood hyd~~ulics (see Pa~t II, <br />Section 3.3). The physical models Qould not, howeve~, be <br />quantitatively ve~ified due to a complete lack of p~ototype <br />data. Hence, use of these ~elations fo~ flood p~ediction <br />will have to wait until field data co~~obo~ates physical <br />model ~esults. <br /> <br />Given the p~esent state-of-the-a~t, the selection and design <br />of flood cont~ol tools on fans should COmbine qualitative <br />analyses of flood behavio~ (fan'cha~acte~istics, hyd~aulic <br />zones, histo~ical flooding patte~ns), enginee~ing expe~ience <br />and judgement, and the existing quantitative methodology to <br />establish the depth, width, and velocity of flood flows. <br /> <br />Recommended App~oach <br /> <br />The following app~oach to flood pl~in management on fans is <br />based on the conside~ations p~esented in Sections 4, 5, and <br />6 of this ~eport, It is intended to be a gene~al model fo~ <br />mo~e detailed sets of ~egulations and guidelines which will, <br /> <br />96 <br />