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FLOOD03232
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Last modified
1/25/2010 6:26:42 PM
Creation date
10/4/2006 11:33:51 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
199
County
Moffat
Community
Unincorporated Moffat County
Basin
Yampa/White
Title
Flood Insurance Study - Moffat County, Colorado
Date
3/1/1982
Designation Date
8/1/1982
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />thereby increasing the lOO-year flood hazard. For any channel <br />modification or fill in the sheet flow areas, a detailed review <br />of the improvement should be undertaken to determine the effects <br />downstream. The results of these computations were tabulated <br />at selected cross sections for each stream segment for which a <br />floodway was computed (Table 2). <br /> <br />As shown on the Flood Boundary and Floodway Map (Exhibit 2), the <br />floodway widths were determined at cross sections; between cross <br />sections, the boundaries were interpolated. In cases where the <br />boundaries of the floodway and the lOO-year flood are either close <br />together or collinear, only the floodway boundary has been shown. <br /> <br />The area between the floodway and the boundary of the lOO-year <br />flood is termed the floodway fringe. The floodway fringe thus <br />encompasses the portion of the flood plain that could be completely <br />obstructed without increasing the water-surface elevation of the <br />lOO-year flood more than 1.0 foot at any point. Typical relation- <br />ships between the floodway and the floodway fringe and their signif- <br />icance to flood plain development are shown in Figure 2. <br /> <br />I- <br /> <br />100-YEAR FLOOD PLAIN <br /> <br />-, <br /> <br />F LOODWA Y <br />FRINGE <br /> <br /> <br />F LOODWA Y <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FlOOOWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE l''1E[) FOR DEVELOPMENT BY <br />RAISING GAlJUND <br /> <br /> <br />ENCROACHMENT <br />,- <br /> <br />o <br /> <br />SlIRCHARC,( . <br /> <br />F LoaD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AB IS THE FLOOD E:.!...EVAT10N BEFO~E ENCROACHfllENT <br />LINE CD 15 THE I-LOOD ELEVATION AFTER ENCROACHM2NT <br />.SURCHARGE IS NOTTO EXCEED 1 0 "'.OOT (FEMA REGUIREMENT) OR LES~~ER AMOUNT IF SPECIFIED BY STATE, <br /> <br />Figure 2. <br /> <br />Floodway Schematic <br /> <br />17 <br />
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