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<br />GLOSSARY
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<br />Approximate Study Area. A stream ~r portion .)f a ~tream which
<br />has the IOO-year floodplain boundary delineated by an approximate
<br />method such as normal depth or a Drainage Area versus Depth
<br />relationship.
<br />Backwater Effect. The rise in surface elevation of flowing water
<br />upstream from and as a result 'Jf an obstruction to) flow.
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<br />Channel. A
<br />extent with
<br />continuously
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<br />natural or artificial watercourse of
<br />definite bed and banks to confine
<br />or periodically flowing water.
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<br />perceptible
<br />and conduct
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<br />Cloudburst. A
<br />is small in
<br />accompanied by
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<br />of rain that
<br />and may be
<br />of wind.
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<br />sudden and extremely hellvy downpour
<br />areal extent; of short duration;
<br />lightning, thunder, and strong gusts
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<br />Conveyance Capacity.
<br />a. Channel conveyance capacity is the rate of discharge,
<br />in cubic feet per second, whi.ch can flow in a water
<br />course with the water surface not greater than the
<br />height of the channel banks.
<br />b. Flood",ay conveyance capacity is the rate of discharge
<br />in the overflow portion of the floodway which can pass
<br />through a specified area at depths and velvcities
<br />Koverned by the hydraulic dimensions of the floodway.
<br />Designated Floodplain. The area designated as a floodplain by
<br />official action of tbe bv1in] of county commissioners Or city
<br /><,;ouIlcll wIlli lh", pd.o': conCUlT",,'C" vI the Colvr"d" \.,'ater
<br />Conservation Board.
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<br />Flo(ld. An overflDw (In lands nDt nDrmally covered by water <lnd
<br />that are used Dr usable by roan. Flo(lds have tWQ essential
<br />characteristics; the inundation of land is temporary; and the
<br />land is adjacent to. and inundated by overfl.)w from a river or
<br />stream or an ocean, lake (lr other b.)dy of standing water.
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<br />Normally a flood is considered as Any temporary rhe in
<br />streamflow vr stage, bu~ not tilt, v"nJing vf ~urf<lce ,.,.<ttter, that
<br />results in dgnificant adverse effects in the vicinity. Adverse
<br />effects may include damages from overfl(lw of land areas,
<br />temporary backwater effects in sewers and local drainage
<br />channels, creativn of unsanitary cvnditions or other unfavorable
<br />situations by depvsition vf l!l8.teri8.1s in stream channels during
<br />n()od recessivns, US" of ground wllt",r coincident Idth increased
<br />streamfl,)w, and other pr.)hl(>l!ls.
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