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<br />rlood~ay Designation
<br />A designated {loadway is the area of the flood plain
<br />provided to convey a design frequency flood. 'rhe"designflood"
<br />often selected in connection with floadway determination is the 100-
<br />y"arfrequencylr.termediateRegionalFlood. rntermsofmaintaining
<br />a reasonable balance between the advantages of reducing potential
<br />flood losses and the disadvantages of overly restricting land use,
<br />the Intermediate Regional Flood's heights and areal limits are con-
<br />sidered most practical for use in gaining the goals sought throug~
<br />selective zoning.
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<br />Buildir.aCodes
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<br />Zoning
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<br />A ~11-written and properly enforced building code can
<br />effectively reduce daMages to buildings in the floOd plain during
<br />flood periods. A few of the requirements which should be specified
<br />in a building code to red~ce flood damages are: prevent flotation
<br />of buildings from their fou~dations by requiring proper anchorage:
<br />establish basement elevations and minimum first floor elevations
<br />consistent with pOtential Hoods: requite structural strength to
<br />withstand water pressure or high velocity of flowing water; restrict
<br />the use of =terials whiCh deteriorate rapidly when eXpOsed to ~'ater;
<br />prohibit equipment that might be hazardo~s to life whe~ 5~bmerged,
<br />such "5 11 C ~\e"ical storag<>, boiler s or e lectr ical equipment.
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<br />Constituting a legal tool that oan be used to implement
<br />and enforce the detailed plans resulting frorn a land-use planning
<br />program. Selective zoning ensures the most beneficial use of flood
<br />plain lands while safeguarding the health, safety and welfare of the
<br />cow~unity_ Designated floodways may b<> reserved by establishing
<br />encroach1'n"ntlines that clearly define the floodwaY7.0ne. Desig-
<br />nated floodways should be ~o"ed for the purpo~e of passing flood-
<br />waters and for other limited uses that do not conflict with that
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<br />prim~ry p~rpose. The utili~ation o~ flood plain lanJH arlj~cent to
<br />the flc>o<iway is limited only by tb" cle'1~e" o~ floo(l ri~k eec""'"
<br />allowable (a det.e~millation o~ local gov<>rnment) and the require-
<br />ments of the cit.y's zoning criteria for the area.
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<br />Development Policies
<br />While all regul~tory controlu arc valuabl~ tool~ in com-
<br />prehe~sive flood da~ge preventicr. plar.ning, probably the no~t
<br />effect.ive tool i~ i~ the arM. of development pOlicies. "Flood
<br />con~cio"~" govern"er.tal ?Olicies cr.at limit the extension of pClblic
<br />ro",,::~, utili~ies a:!d other nervices into ~lood p,-one areas can play
<br />3n i~port3"t in~ircct rol~ in shapi~g eve,-"ll development. By
<br />locating public facilities away f~om flood prone are~s, a soft-sell
<br />nega tive infl'~~"ce is pro~"-c tecl ",hie't e1\COu~dges the oc<:up""cy of
<br />"i,,~c::- ",..<:! ~:::~cr "::-~,,,,:;!.
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<br />SutxlivisionRequlations
<br />Subdivision regulations are used by local government~
<br />to specify the manner in ",'hich 1,>1\<:1 ....y be divided. They ".,;:,.y ~t/ltc
<br />the r"''l.uire'' wictth ()f ~tr"''''~~, ,.~o:uirements for curbs and gutters,
<br />size of lot., elevation of land, freffiiom f~om flooding, si7.e of flood-
<br />ways <lnd other poilltspHtinent to the healt!'., safety and weHareof
<br />the community. These regUlations provide an effectiv~ ~~an5 of con-
<br />trolling construction and p::-eservinq floodwaY3 i~ ptesently urAevel-
<br />opeu flood plain arca~.
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<br />Flood proofing
<br />flood proofi~q is a combination of structural changes
<br />arid "dj~stroe"ts to prop"rti,," subject to fioodin'l primarily for th"
<br />n,c\lJ.Ctb" Cr "litnill"tion of flooc! c!a",""".,. r,ltho"gh it ic. Nsi"..
<br />""d mere ~'c<lno"".i~,,lly ,,~,pl.i"d tD "e~' cor.~tructLo~. floD<! proofing
<br />is "lso applicdhle to exis~in9 facilitieq. An examp]~ of a flood-
<br />proof",". buildi"9 is depict"", on th~ followinc page.
<br />.^. '~3efd quirk, "Ir,trod~ctcon to Flood I'rcofir.<;," pre-
<br />I"'red by t~le Center fer Urban Stucli;,s, ':~Lvcr~ity of Chicago, ~"der
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