<br />Background
<br />
<br />Several years ago, the community completed a comprehensive
<br />program to map all of its floodplains on 2 foot contour interval
<br />maps. The results of the effort were published by the City, in
<br />coopertion with the CWCB, in a floodplain information report.
<br />The floodplain administrator maintains a set of official
<br />floodplain maps, on a scale of 1 inch equals 200 feet, showing
<br />buildings, topography, lOa-year flood boundaries, and a proposed
<br />channelization project by the Army Corps of Engineers.
<br />
<br />The community is enrolled in the Regular Phase of the
<br />National Flood Insurance Program (NFIP). The Flood Insurance
<br />Rate Map (FIRM), the Floodway Map, and water surface profiles
<br />published by the Federal Emergency Management Agency (FEMA) are
<br />in substantial agreement with the earlier study which has been
<br />designated and approved by the ewCB. The Floodway defined by
<br />F&~ is based on a 1.0 foot rise criteria.
<br />
<br />The floodplain ordinance adopted by the community is more
<br />stringent than FEMA's model ordinance. The key elements are
<br />briefly listed below:
<br />
<br />. a two district floodplain based on the floodway concept
<br />and a 0.5 foot rise.
<br />
<br />. a 1.0 foot freeboard (i.e., the lowest inhabitable
<br />floor must be 1.0 feet above the lOa-year flood
<br />elevation) .
<br />
<br />.
<br />
<br />a 15 foot offset is required from the floodway boundary
<br />to provide for evacuation and to minimize potential
<br />erosion problems.
<br />
<br />.
<br />
<br />Er,Q$;ign protection must be provided opposite a
<br />struct9~~~~ere:l(j0';;yeai'. flood "~velocities:w.ill exceed 3
<br />feet per' seco,nd',' -: ':C_C"-: " 'l~ .:,,;.:': c.....
<br />. . , ":' ' .: '~ -~
<br />
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<br />Materials -' ' :-:_<,""4'.; "'..lC'.,'..... 'J"
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<br />
<br />In. aCC01='d:.ulce" 'iii.t}l :'pr9cedUJ:'esc, est:ablilslled"fby;;tl1e;"planning
<br />commission, the' follc,ii,iing.materi'als';bage been-pro'ir:i.,dedi.for the
<br />review: . "- C:" ...c-:::. .."
<br />
<br />.'.' '"'l:..:1. ri;.\' "" -' .,
<br />. a copy~gf: tn~ prel,.i.mina'ry"sfte 'plan''prepar,ed by. ~he
<br />appli'cant 'l.ihJ.ch als'o'sbow's: a. 'lOO"'Year':floqpplain and
<br />floodway . .' ", , '- ~
<br />
<br />. the official adminis~rative map of the existing
<br />100-::yeaJ:' floodplain and ,floodway
<br />
<br />.
<br />
<br />an engineering analysis provided by the applicant at
<br />his .expense showing the floodplain as it would appear
<br />after"development if the project were constructed on
<br />fill .material.
<br />
<br />.
<br />
<br />the FEMA Flood Insurance Rate Map and Flqodway Map
<br />
<br />-2-
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