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<br />respectively. The flood m~y occur in ~ny ya~r.
<br />
<br />It i s b~sed On
<br />
<br />statlstlc~1 analyses of streamflow records and analyses of rain-
<br />fall and runoff characteristics In the general regIon of the
<br />watershed.
<br />
<br />SheatFiow
<br />
<br />The water which Is diverted from the main floodflow by
<br />obstructions and variances In topography. This water flows at
<br />shallow depths and normally at elevations dIfferent from the water
<br />flowing In the ~djacent channel or on the adjacent flood plain.
<br />Due to the Shallow depths and lrrogular flow p~tterns assocIated
<br />wltn this type of flow, computations to predIct flow depth ~ro
<br />consIdered impractical.
<br />
<br />Top of W~terway
<br />This isth<;}roofofthaopenlng lnastreamcrosslng
<br />through which wilter floW$ under norIMI conditions. It is the
<br />underside of the dock span. someTImes called "low STeel". The
<br />roof of II ~x culvert, or the crown of an arched or circular
<br />culverT.
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