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<br />City of Fort Collins <br /> <br />Hazard Mitigation 404 Grant Application <br /> <br />Inadequate Storm Sewer Conveyance - The older sections of Fort Collins pre- <br />dated floodplain regulation and drainage criteria. Generally, the storm sewer <br />capacity is only at best sufficient for the 2-year storm in the Old Town drainage <br />basin and other older sections resulting in frequent flooding of homes & <br />businesses. Although capital improvement projects are scheduled to upgrade <br />some reaches of storm sewer, scheduled construction remains many years away <br />for some areas. However, cost benefit analyses show (Chapter V) floodproofing <br />is more cost effective than upgrading storm drainpipes. <br /> <br />Inadequate Street Conveyance - Street conveyance has been diminished by <br />maintenance activities over the years due to pavement overlays that have resulted <br />in as much as a foot of increase in crown height. In some areas, street crowns are <br />now higher than adjacent building foundations_ Capital improvement projects are <br />scheduled to regrade some streets. However, the Old Town Master Drainage <br />Basin Plan, prepared in 1993, states some of "-.. these reaches cannot be <br />improved by street regrading because the lots are lower than the adjacent streets <br />and individual house floodproofing appears to be the most feasible alternative." <br /> <br />,- <br /> <br />Inadequate Drainage Channel Conveyance - Building encroachment on natural <br />drainageways has reduced the capacity of open channel conveyance. Areas of <br />development prior to floodplain regulation encroached upon the drainageways <br />leaving little more capacity than for nuisance flows_ For example, according to <br />the Major Drainageway Plan for the West Vine Drainage Basin, prepared in <br />1980, "_ _. drainage related problems exist in the West Vine Drainage Basin due to <br />lack of major drainage facilities and development over the historic drainage <br />path..." Re-establishment of the drainage corridors to proYide conveyance of the <br />100-year event will require acquisitions and drainage easements which are costly_ <br />This problem is especially prevalent in the drainages of the Canal Importation <br />Basin on the west-side of Ft Collins. <br /> <br />Sewage Back-up - If storm and sanitary sewers do not have the conveyance <br />capacity to handle a major flood, they can become surcharged and back flow into <br />basements that are not flooded from surface water. This was a common problem <br />during the intense flood of 1997 and can most easily be corrected by installing <br />check values in critical locations of problem areas. <br /> <br />C. Relationship ofthis Project to a Bigger Project <br /> <br />This floodproofing project can stand on its own. <br /> <br />The Fort Collins floodproofing program has the potential to become a useful tool <br />in an already diyerse floodplain management program. It is a given fact that there <br />will always be intense competition for capital improvement funds and that there <br />will be some situations where it is simply more cost efficient to construct <br />floodproofing. <br /> <br />It is important to evaluate the role of flood proofing relative to a property owner's <br />participation in the National Flood Insurance Program. Flood insurance may be <br />the best option for properties that are not selected for floodproofing funding. <br />18 <br />