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<br />ROild elev~tions on tne bridgo approaChes are lower and overtopped by <br />lessQr f loads than the br iege decks. ,~II crossi ~~s On .1eir Su Icr <br />~M rr;a_1y O~ the ;;tncr ~tr()(lms uti I i~e pipes and culve~ts to "owey <br />strea"l I lows. These slructuros aro I()Cdt<ld in the ch~nnQls and <br /> <br /> <br />gonerally th'W' c"p<,c:itle5 equal ~c or le~~ t~an t~e "05t'-03'11 chan- <br />nol. Excopt tor Hellard Street on 'klntyr., Sc'lch '"oico "OlJld not ~() <br />inunddtedby<>St<lndardProjectFlood,dll straetswould"einun'<>ted <br />"y discharges 01 1"55 th~ln the I ntermedlate Reg 10M I Flood, wi th som <br />bolng flooded even by minor flow> which can cause a disruptIon of <br />tr"ffic. <br /> <br />O~5tructions to Flood Flow <br />Thoobstructionstotlow<>retneITlanybrldgcs,culvert5, <br />and p I pes located on Group 2 streams. '/,'e; r Gu I ch ha5 ~ cu I v~rts In <br />the 5tudy reach ttlat are adequate only lor passing mhor flood dis- <br />ch<lrges. The bOx cu Ivert on W<105wort:, Sou levard, a <n~jor traft Ie <br />artery, is on I y c"pa~ Ie of pilS51 ng <noocr<::to f loocs ond wou Id be a <br />Ser i Ou 5 res tr i ct i on to high f; Ow S . Elf cct5 of tho b r 1 d~Je and cw 1 ve rts <br />wore tul:y considered, a~d hack~ator conditio" are shown nn the <br />w~ter surface prof lies. The ct,anne I cd~acltle5 cou Id be further <br />restrict-ed by an accumu latlon of de~...15 and 51 It. I n the Ingalls <br />Street ;are<!, ;along Lal<.ewood (';ellch, loe,,1 ;ntArests l)<Ive ti lied In th€ <br />flOO<:lplain, re5trictirnJ0verb"nkfl0\015 "ndca;JS;ngcl rise in Ihe <br />up5tr'}dITlWatcrsur/Hce. Several small dilms have be""con5truc/..don <br />/h050 ~tr"am5 by local inten'sts. They only provide ",inor flood <br /><:onlrol, lJut Caus., a bac~1 Jlg-up of the /Icod flows. <br />Heal! losses through th"bridges werecO/!'",uted by the <br />method doscrlb()d In "Hydrou I ics of Gridgu 'lIaterway~," by thO ~Iv Islon <br />:)f Hydr;au I ic ~e5e~rch, [Jureau of Pub I Ic Roads. 1960. '~hen br; dgos <br />and aporo~ch roadS were overtopped, t~o roud emlJankment5 were cen- <br />slllert><1 ~~ brO<ld-crested "oi r5. The bac~"ater effects ~re shown on <br />the water surface prol lies. p letas 21 through 23 0/ t~ is report. <br /> <br />t.rowth and I ittor i n dr~ i n"'lew"ys i ncr""se 'Iood i ng as we II as bei ~~ <br />unsiGhtly. <br /> <br /> <br />-, <br /> <br />.. -, 0,:.' .,~' <br />",., ' <br />~l,,~ .,,::_.,-.'::~ ;fh"' <br />1,t:;_'~.:!);.l;; <br />.l.'OIO";ofl": ''",' <br />..... ~ .."" <br /> <br />n,' <br />'f;;' <br /> <br />l~k",w""rl r,,,lcn <br />T0P-Vi"wupstream fro",liilrl.ln Street. <br />R)TTa~ - Virw dowo~trP.am /ro~ Sherlcan [Jlvd. <br /> <br />" <br /> <br />" <br />