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" February 16, 1977 " ~ ~_o ~'/' While a certain amount of literature is available concerning recommended approaches to flood proofing, there is very little in the literature concerning flood proofing against'the effects of high velocity flow which is common on Colorado streams. specifications for foundation design and frame attachment need to be developed for th~s case, as well as recommendations for building code amendments. In the area~ of economic analysis, there are several areas where an apalysis could be of substantial help in evaluating development proposals as well as in gathering support for poteptial flood hazard regulations. This information could be of use both locally as well as to other front rang~ counties. -An analysis of comparative cos~s for floodplain and non-floodplain land development could be made ta~ing into account adequate methods of flood proofing d~veloped in an earlier phase of the study. Based on this data, an analysis might be made of potential destruction from- a 1% recurrence interval flood event, based ,on present Occupancy, and potential occupancy. i " ,[ ) , It is our urderstanding that the intentions of the scope of study prepared by the Corps is to calibrate the EPA SWIM model tp conditions in the Poudre River. We would suggest that such a study be' included in the scope of study, with a'detailed indication of expected results. Data developed should include development of a peak discharge profile for the main channel, local inflows resulting from 10, 50, and 100 year storms, runoff coefficients, and effects of development alternatives. Of specific concern is development in the Fossil Creek area between Fort Collins and Loveland. Of concern is the development of technical data with which to address local drainage and storm water runoff considerations. Toward this work, Larimer County will provide basic data presently available on soils and geologic conditions. As discussed, Larimer County wishes to procure flood water surface profile data for limited reaches of the Poudre Canyon. Toward this effort, Larimer County will provide surveying, topographic mapping, and cross section data. Flood water surface profiles need to be developed within twelve months so that such data can be included with FIA work which is o?going.