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<br />rise, and duratIon of flooding measured above bankfull s1~ge. Water
<br />velocities durinQ floods depend largely on the size and shape of the
<br />cross sectIon, condition of 11\<3 strearr a~d bed s lope, a I I of wh lch
<br />v<Jryon different stroa'l'.5 and at different locations on the same
<br />str'lam.
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<br />Obstructio~s
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<br />During floods, dllbrls collecting on bridgElsand culverts
<br />could decredse their carrying c~paclty and increase water depths
<br />(backwJter effect> u"stream of these structwres. SInce occurrence
<br />and amouf\tof debrIs are 1 nde'termi nate factors, only the physical
<br />char~cterlstic5 of the structures were consIdered in prepari ng pro-
<br />files. High velocity flows canexperlence a rapid increase in
<br />oopth ~s they meet an obstruction In the stream. The sudden i n-
<br />cre~se in depth or "hydrau I ic jumo" can extend the f loods o~mage
<br />potontial. Obstruct I vtl new oove I oPoent and tuture land tilling in
<br />ornearthestrea'l1'sfl<XXlwaycanbearnajorfadorlnmultiplylng
<br />theadverseeffectsdes<;ribed. For STudy purposes hereIn, ith1ls
<br />been aSsumed that limited clogging can be Gxpected andali bridge
<br />structureswouldrel'Vdln intact.
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<br />rlltureFloodH.lights
<br />TI1<l eleVBtlons that the I ntermed I~te Regional and the
<br />Standard Project Floods are expected to reach are indicated at
<br />brin'l"'><'Jlongthe strea",on T1Iblo4. Tho5efloodlllevationsare
<br />alsoindic::ltedinthefollowlngphotogr!:lphsatvarious locatlons
<br />alcngthecreek.
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