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b. No proposed building lot lhat is partially subject to flooding shall be approved, unless lhere is establisbed on the lot plm~ a line representing an actual contour at an elevation two (2) foot above the 100 year flood. Such line shall be known and on plan or "building ~'estr/ction identified the lot lhe flood ~le". All build'in~s o~ structures designed o~ intended fo~ use shall be located on sueb a ]ot so ~bat ~he lowest usable and functional part of lha structure shall not be below the elevalion of building re~Irielion flood line. Usable and functional part of the structure is defined as being inclusive of living areas, basements, sunken dens, utjlily at~aehed cal'poPls and mechanical appul, lenauces such as furnaces, air eondilioners, walev eleelrieal conduits pumps, and wiring but shall not include water lines ay sauilary sewer lraps, piping and eleanouls provided openings serving ~he slruclure are above ~ha building reslriefion flood line. h'bere only a per,ion of a praposed building lot is subject flooding, such 1o~ may be approved only ~ ~hey will be available for building, a usable lox area of uot less ~han square feet. The usable lot area shall be delermined by deducting from the tolal lot avea the area of lhe setback required by an applicable zoning district regxdalion and any remaining aI.aa of ~he lot lying below ~he building reslric~iou flood line. 3. During the eOnSlructio~, preparalion~ avtangemellt~ and insta]lalJon of subdivision improvements, and faeililies in subdivisions localed or along slveam bed, lhe developer shall mainlaiu lhe sa'earn bed slveam, creek, ay conli~ous to backwash subdivision in an unobslructed s~ale. The developer shall also remove from ~he channel and banks of the stream all debris, logs, l/mbe~, ~unk and othev accumulations of a nalu{-e lbut would, {~ Ii[lie of flood clog or dam Ihe passage of waters in their downslream course. Installation of approp~'iately sized sierra water drai~is, culverts or bridges shall hal be conslruod as obstructions in the SECTION 4.6 RIVER STREAM BUFFER All subdivisions containing or located adjacent to all rivers or streams shown on USGS Quadrangle Maps as a solid blue shall be subject lo all of re~lations set forth iu Seelion 3.]3 (River/Stream Overlay Zone) in the Caba~u. us County Zoning Ordinance. SECTION 4.7 SEDIMENTATION POLLUTION CONTROL Upon approval of the preliminary plat mhe Planning and Zoning Slaff shall notify the Norlh C~rolina Department of Environment~d Health snd Nulural Resources of such ~pproval. All 8pplieable requirements of Ihe Norih Carolina ]6