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<br />I~
<br />
<br />POTENTIAL
<br />
<br />hble?
<br />FlCXXl PfAKOISCHARGES, NATURAlCO~lrION5
<br />TOLL GATE CREEK 6ASI~
<br />
<br />Location
<br />
<br />Intermediate
<br />Regional
<br />flood Peak
<br />Olscl'!lrge,
<br />C.1.5.
<br />
<br />At 6th Avenue
<br />
<br />Toll Gate Creek
<br />21,200
<br />
<br /> West Toll Gat" Creak
<br />" "",utn 15,200
<br />" Je...ell Avcnut! 14,700
<br />Ref. Pt. 49 11,100
<br />Upstream limit 0' study 4,800
<br /> Unnamed Creek
<br />At mouth 6,000
<br />Up~tr()am Ilmltol study 5,800
<br /> East Toll "''' Creek
<br />Atrt'lOuth 7,500
<br />Ref. ". 119 8,100
<br />Upstr-.:Jdm limit " study 3,900
<br /> Sherry CraekSpl11wilY Drain
<br />At mouth 3,180
<br />Upstream 0' 111ft Avenue ,eo
<br />
<br />15
<br />
<br />Standard
<br />Project
<br />Flood Peak
<br />Dlscha'llll,
<br />c.t.s.
<br />
<br />KcIlardsofLargefloods
<br />The flood hazard on the Toll Gate Creek ~asin stredms is
<br />shown on the pllltasat the ..odot this rep<>rt. ne flOQ01ed ",,....,as,
<br />plate, 2 through 5, ShOW the extent of floodi~g under natural conditions.
<br />The profllas, pl<ltes 6 thro~gh II, show the death 01 the 1 low in the
<br />channel and provide water s~rface elevations to ~Iate the floods to
<br />features along the streams. Cross sections taken at Intervals along
<br />the streams a.... shown on plates 12'thr009h 17 to give an tldded dl"'<3nslon
<br />to the flood portrayal. Only the Intonnadlate Regional Flood Is shown
<br />In the reaches of the proposed Im~rovements, but the flood Is shown
<br />for both the exIsting and improved conditions. The alignment, shape
<br />and general dimensions of the proposed channel are shown In the reaches
<br />'''here tho proposed Improvements are being consldered by the city of
<br />Aurora. Channel improvementswerelnprogreS5ontheCherryCre..k
<br />Spillway Dr",inat thtl time of the study. The flood condltlons
<br />shownforthllttributaryarebasedonthodesignodlmprovementssinee
<br />natural conditions ~ longer exist.
<br />R..lere,""" ~int" an" provided on the "xlsriny struam centerline
<br />sotr,atthcvariousdiltasourcos, such as platosilnd tilbles, Can b e
<br />correlated. Tables 3 and 4 proviae flOOd plain reference d~ta for
<br />the var;ousstudy reach st rc,,",s , TaUle3. for the reachcs with proDosed
<br />channol, inol.udOsforoachroforoncepoinT,Thedlstancofromlntorstato
<br />Highway 225, ~asured along the proposed oh~nnol, the existing a~d pro-
<br />posed Channel sTre~ bod elevation, 'the existing condition and proposed
<br />chanr.elwatcrsurtaccproflleforthc IntermediaTe Regional Flood,and
<br />occasional oro% section alignment bcar;n!1s wc.ere they mig~t be useful.
<br />Table 4 SnowS dist"nce from mouth, cMnnel bod elevations, wator surface
<br />elev~tlons for tho Intermediate Reglonal and Standard Project Floods
<br />under ex ist i ng condItions, and cross 5"ction h"~ri r\oJ5 tor ref"r","rf'
<br />points alon!1 those strClam reaches whereonann"i improvement Is ~t proposed.
<br />Tb", f loo~ed ",""il maps w"r., d"ve lop<ld ho; nroj"ctl"9 W<1ter surtace
<br />protiles onto toOogrilDhic,"dPS supplied by 'the city of Aurora Irornv arious
<br />sources and supplcmBnted by a~dltional cross sections su~veyed in '073. Tn"
<br />.."ri,ll phntogrilp"S LJsed as b,'Sf! m.,ps wer" 'In..n in 197). Pn'"n'tlal flOOd
<br />depths at specific paints on the flood plainean be found by cornparlM the
<br />
<br />37,000
<br />
<br />25,800
<br />22,700
<br />17,000
<br />6,700
<br />
<br />8,200
<br />7,600
<br />
<br />12,000
<br />12,400
<br />6,200
<br />
<br />4,100
<br />500
<br />
<br />"
<br />
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