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<br />Guidelines and Specifications for Flood Hazard Mapping Partners [April 2003]
<br />
<br />Selection of Technical Methocli-Riverine and Lacustrine
<br />
<br />
<br />Table 1-1
<br />
<br />I'~'~.:!!f
<br />
<br />. .' or.
<br />:..:~
<br />.....
<br />.tt~ :.
<br />.. I" ....'" 'II'"
<br />"" ........r.;: '\.. ....w.-!. . J-
<br />.~ '
<br />
<br />,.!"
<br />
<br />
<br />~. .".. IIoIwi
<br />.o.L
<br />i" .... . oftt I
<br />" '.. ~ .... I' . _ ~~..
<br />OPllON;NOT AVAILABLE ,;...'..;.
<br />... .._. ._." I .
<br />-:....... ... .0'" ..
<br />
<br />:~ ,;-" . ....
<br />~ II . .'.'\'1.
<br />., . ......~.lIiII;.
<br />J
<br />.~ ......
<br />,,,,,M._
<br />
<br />r!
<br />
<br />"1,.
<br />
<br />..
<br />
<br />1:'W:':lI,,,,'v
<br />
<br />.,
<br />
<br />:," .,
<br />
<br />.
<br />
<br />.
<br />
<br />Approximate
<br />Study
<br />
<br />."'..'
<br />..... -
<br />{i,,:,.
<br />
<br />,...'
<br />....
<br />
<br />......,
<br />. ....-.....
<br />~OT A\(AILABLE
<br />
<br />.... ..
<br />
<br />.;.
<br />
<br />,.oj.;':
<br />
<br />fH ;. ~:.' .I......,:.~'.
<br />III .............l ...........
<br />
<br /><:.?~~PON
<br />
<br />"""-.'"
<br />
<br />.:'~......
<br />,,(oj, ,
<br />
<br />-
<br />
<br />-:.:
<br />
<br />."'!'I'II
<br />....:. .... ........
<br />,~.""","V"I..,IUV9""
<br />I..:.~ '~~';....~~ '",'
<br />. ~...,
<br />..
<br />J
<br />
<br />. :-
<br />
<br />"
<br />
<br />I
<br />
<br />..
<br />.
<br />
<br />II"',,=W.~,
<br />
<br />. Effective discharges and BFEs appear accurate, but SFHA
<br />seems inaccurate (e,g" flooding losses in Zones B, C, or X;
<br />numerous LOMAs; comparison with accurate topographic data)
<br />
<br />/woo
<br />
<br />I
<br />
<br />...
<br />
<br />~.-
<br />:q.~' .....
<br />
<br />..
<br />.- .
<br />.;
<br />
<br />'"
<br />.'
<br />
<br />J.
<br />,LO-
<br />
<br />~
<br />.' .
<br />.~
<br />
<br />-
<br />.~
<br />
<br />._-
<br />..-....
<br />
<br />
<br />SFHA seems
<br />X; numerous
<br />
<br />I ~:
<br />-.
<br />
<br />..."
<br />~
<br />. Effective discharges and BFEs appear accuJfte, but
<br />inaccurate (e,g" flooding losses in Zones ,C, or
<br />LOMAs; comparison with accurate topograp ic data)
<br />
<br />"
<br />
<br />\,
<br />
<br />';'" ,I
<br />
<br />...., 'P.. -
<br />
<br />':'bPTIO.~ 'N~'!:d
<br />AVAILABLE.. i
<br />.: .1. _.
<br />
<br />"
<br />
<br />.1
<br />
<br />'~.J)'PTiol'i'. ..
<br />. .:!NOE~:...~~
<br />oft .,
<br />AV~ILABLE
<br />
<br />Redelineation
<br />
<br />. Additional years of record available for stream gage analYSIS
<br />resulting in significantly different discharges
<br />
<br />Flood experience indicates that discharges a1nd BFEs are outdated
<br />(e,g" USGS gage information indicates discharges out of date);
<br />
<br />.
<br />
<br />development
<br />
<br />.
<br />
<br />development
<br />
<br />.
<br />
<br />Detailed
<br />Study
<br />(Riverine)
<br />
<br />. Hydrology and/or hydraulic methods outdated
<br />
<br />. Flood experience indicates that discharges and BFEs are
<br />outdated (e,g" USGS gage information indicates discharges out
<br />of date);
<br />
<br />has significantIyj altered discharges;
<br />channelization, br~dges, etc,) since FIS
<br />
<br />watershed development
<br />floodplain projects (e,g,
<br />analysis;
<br />
<br />.
<br />
<br />anUlor
<br />
<br />. flood control structures since FIS analYSIS
<br />
<br />watershed development has significantly altered discharges
<br />
<br />.
<br />
<br />. community wishes to add regulatory floodwa
<br />
<br />since FrS
<br />
<br />etc,)
<br />
<br />(channelization, bridges,
<br />
<br />. floodplain projects
<br />analysis; and/or
<br />
<br />events
<br />
<br />Section 1.3
<br />
<br />flood control structures since Frs analysis
<br />
<br />appear accurate based on pas
<br />
<br />.
<br />
<br />. Effective BFEs and SFHA
<br />
<br />events
<br />
<br />. Additional years of record available for stn~am gage analysis that
<br />results in significantly different discharges
<br />
<br />.
<br />
<br />ed on pas
<br />
<br />and/or hydraulic methods outdate
<br />
<br />appear accurate b
<br />
<br />1-36
<br />
<br />. Effective BFEs and SFHA
<br />
<br />Hydrology
<br />
<br />. Effective SFHA
<br />appears accurate -
<br />area has not
<br />experienced
<br />flooding
<br />
<br />. Areas of no or
<br />minimal
<br />development
<br />
<br />Use Effective
<br />Information
<br />
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