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<br />,Maintenance of channel stability, Several factors relating to channel
<br />stability can influence or change a watercourse, For example, the
<br />alignment and grade of a channel or the material on the channel
<br />banks and bottom can affect the flow velocity, which in turn may
<br />cause erosion, deposition, or both,
<br />Generally, an applicant should provide the administrator with a
<br />topographic map of the area in question, a comparison of the existing
<br />and proposed channel capacity, a plan view and a profile view of the
<br />existing and proposed floodplain, a description of the proposed altera-
<br />tion, land use of adjacent properties, description of any obstructions,
<br />and photos of the area
<br />A legal arrangement to assure maintenance of the alteration project
<br />by a publiC entity will be needed, The entity could be the local govern-
<br />ment, a special district or a homeowners' association,
<br />NFIP regulations require the local administrator to notify adjacent
<br />communities and the CWCS Floodplain Management Section of any
<br />proposed watercourse alterations. It would also be advisable to notify
<br />the local conservation district and the State Division of Wildlife of pro-
<br />posed alterations,
<br />Aiterations may necessitate CWCS redesignation of the area in
<br />question,
<br />
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<br />
<br />D, Nonresidential Structures
<br />NFIP regulations allow for nonresidential buildings (commercial struc-
<br />tures, garages, warehouse, etc,) to be flood proofed rather than elevated
<br />to provide protection from the base flood, Floodproofing consists of
<br />designing a structure in such a way that all parts of the structure
<br />located below the base flood elevation are water.tight and resistant to
<br />flood damage.
<br />Any time a nonresidential structure is flood proofed, a registered pro-
<br />fessional engineer or architect must certify that the flood proofing
<br />measures meet the NFIP design standards, This certification, referred to
<br />as a Preconstruction Floodproofing Certification, must be submitted with
<br />the permit applications, A sample form is in the Appendix,
<br />In addition, once the structure is built, a Postconstruction Certifica-
<br />tion form (see Appendix) must be completed by a registered pro-
<br />fessional engineer or architect certifying that the building is
<br />f1oodproofed to or above the SFE.
<br />
<br />t,
<br />
<br />E. Residential Structures
<br />The lowest floor of residential structures must be elevated to or
<br />above the base flood elevation, It must also be placed on a pad of com-
<br />pacted fill that is at or above the base flood elevation,
<br />NFIP regulations require a community to obtain and maintain a
<br />record of the elevation of the lowest floor of all new or sUbstantially
<br />improved structures in the flood hazard area To comply with this
<br />regulation, communities must require the owner or developer of such
<br />structures to provide a "Postconstruction Elevation Certification" once
<br />the structure is completed,
<br />
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