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<br />VERSION 1.0 1/12/95
<br />
<br />B-C PROGRAM: Flood Hazard Risk
<br />
<br />FLOOD HAZARD RISK '
<br />
<br />Carry Over
<br />Information
<br />
<br />PURPLE Blocks (Carry Over). Information from the LEVEL ONE
<br />DATA page is displayed to identify the building under consideration and
<br />to provide reference information and guidance for LEVEL TWO
<br />(Detailed) evaluations.
<br />
<br />FLOOD HAZARD DA TA
<br />
<br />Flood Data
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<br />Flood frequency, discharge and elevation data MUST be entered in the
<br />flood hazard table in order to calculate the degree of flood risk at the
<br />site under evaluation. Flood data for 10-, 50-, 100-, and 500-year
<br />floods are generally available from the Flood Insurance Study (FIS) for
<br />the area under evaluation. However, if flood data for other frequencies
<br />are available, the frequencies and corresponding discharge and
<br />elevation data may be entered in this table.
<br />
<br />The table showing the expected annual number of floods is
<br />automatically recalculated whenever the flood data are revised.
<br />
<br />Flood Discharge The FIS contains a table of flood frequencies and discharges similar to
<br />Data the two left hand columns of the table above. If more than one set of
<br />discharge data are shown for the stream, use the discharges for the
<br />closest location downstream from the building location.
<br />
<br />Flood Elevation The FIS also contains Flood Profile graphs which show the elevations
<br />Data of 10-, 50-, 100-, and 500-year floods along the stream. The elevation
<br />of a 1 OO-year flood, for example, varies with location along the stream
<br />because water runs downhill. To characterize flood risk at a given
<br />location, it is necessary to know the elevation of the 10-, 50-, 100-, and
<br />500-year floods at this location. These data may be obtained from the
<br />Flood Profile graphs in the FIS.
<br />
<br />7-2
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