PERMFILE107820 - Laserfiche WebLink

Home Browse Search

-~ t ~ • • .. November 28, 1994 Mr. Don Marostica Page 3 flood inundation boundaries such as the 100-year and 500-year floods depicted on the maps provided to CTM Place by the county. fn addition to defining flood inundation areas, hydraulic modeling was conducted to determine the allowable encroachment within the 100-year flood area (see above definitions). The computer model was run limiting the 100-year flood flow to a width which is narrower than would occur naturally. This generally caused an increase inflow depth and an increase in flood elevation, known as the surcharge. Federal regulation limits the surcharge to 1 foot. However, Larimer County limits the surcharge to 0.5 feet. The report calculated the encroachment for both a 1 foot and a 0.5 loot surcharge and presents the results in tabular form. The boundary of the floodway, assuming a surcharge of 0.5 feet or less, is presented on the iloodplain map prepared specifically Tor the county. This is the map you obtained from Mr. Rex Burns of the county and which Dave Lingle has used for his preliminary site plans. The surcharge of 0.5 feet allowed by the county is less than the 1-toot surcharge allowed by the city and by federal regulations. The lower surcharge will allow for less lateral encroachment of the iloodplain and, hence, a smaller flood cringe. I am not aware of a map depicting the floodway based upon a surcharge of 1 foot or less. It may be that the boundary of this floodway would be located farther north than the boundary shown on the county map. I would need to obtain copies of the computer printout to evaluate whether the change in location of this boundary would be significant. Summary of Floodplain Building Codes Chapter 15.14 of the Loveland building code describes iloodplain building codes adopted by the city. The purpose of the codes is to minimize public and private losses due to flooding and to protect public health and safety. The codes apply to those areas of °special flood hazard° which is defined as the area inundated by the 100-year flood. Since development is discouraged within the floodway, the Floodplain building code effectively refers to development/construction within the flood fringe. A iloodplain development permit must be obtained prior to construction within the flood fringe. This can be accomplished on forms available from the building department. The following items may be of concern to you in considering potential development of the CTM Place property: • Structures built within the floodway may not be designed for human habitation;