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GLOSSMY OF Tm~S Flood Profile A graph showing The relationship of water surface elevation to location, the I~tter gonarally expressed as d i stence above mouth for a stream of water f lowing in ~n open channel. It is general I y drawn to sho" ~",rfacc elevation for the crest of ,1 spa<:: if Ie 11000, but ~ay be prepared lor conditions at a given tiMe or s~age. Backwater The resulting high ,~"ter sur-face in a gi~f.m stre<wn due to J downstre~ ob5truction or high sta~s in an lntersect1ng stream. Flood An overflow of lands not normally covered ~y water and that are used or usable ~y man. Floods haV9 t"o essenTI~1 characferistics: the 1m ndation of I and i5 tanporary; and the land is adjacent to ~nd inundated ~y overf low from a river, stream, ocean, lake, or other ~ody of standing water. Nonnal iy II "flood" is considered as any tW1pOrary rise in 5tre~mf low or stage, but not the pond ing of surface water, that rcsu Its in signlficent adverse effects in the vicinity. Adverse effects ~y Include damage~ from overflow of land areas, temporary backwater eff0Cts in se"ers and local drainage channels, creation of unsanitary conditions or other unf~vorable situations by deposition of materials in stream chanr'lels dYri n9 f lood rece~sions, ri 5" of grwnJ water coincident with increased stre~m flow, and other problems. FloodSlago The stage or ellwation at whiCh oyerflo" of the natural banks of a streilmor body of "ater begIns in the reoch or area In Which the elevation is measured. HydrClqraph A graph ~howing flow values agaillst time at a gIven point, usuallymM5ured in cUbic feet per 5BCOnd. Tho area under the curve indicatos total volume of flow. Flood Crest The maxirr.."" stage of eleviltlon nmchoo by tho w"ter~ of il flood ~t a gIven locet1on. IntermL~i~te Rogion~1 Flood A flood h~vin9 an avera~e frc~c"cy af occurrenCe In the order 0/ once io 100 ye~rs althcuyh the flood may occur in "'y ye~r. It Is based on sta~lstical analyses of streamflow rer-ords avallahle for the watershed and analyses 01 rainfall anj r1JM,f/ "hM'aat"rlstiCs i" Lou ~'ln..rdi ,....'<] ion 0; fhe "dters",,,J. Left""nk The dre~s adjoining a river, stream, waterCC'-Jrso, oc<)~n, lako, or other body of stallding w~ter th<lt hdve be"n or ""'y be cov"re<:l by f lO<':Jw~t..r. ihe b~nk on the left side of a river. stroam, or w"tercO;Jrsc, lookln] downstream. floodPlain RlqhtBank The b<lnkon the right side of a river, lookIng dDwnstream. strCdm.orwaterCClJrso , " "