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<br />Stl'eet. P,l1 fleod flo'IIs pass throug~ the Colieqe A"en~€ bricge and ~r€ con-
<br />
<br />flows through open fieldsar.dthe floodplair. is very wide and shal low. There
<br />
<br />tai~ed \,it.~'!ll tne cha~ne1 ~ar...s il:rJed~2tely dOh'r1st~ear' uf College ..'.vcn~e.
<br />
<br />are some sheet f1 ow areas near the laril'lOr County Ii2 Cdrld 1 "nd tile I~e'" ";~t'~e r
<br />
<br />Canal. There are no bui1dings in the floOdplain in this reach.
<br />
<br />Rea~h 5 - Co 11 ege Aven'.IC to Co I orado t So~thcrn Ra il road (::iheet 5)
<br />
<br />Exter\5 ive flood ing QCC~rS Chrou<JIi a nlobile hOlile park '4}5 t,'eall' of College
<br />
<br />runs undor tile park. Sane cOT'lllercial buildings dnd single-family homes dre
<br />
<br />Reach 8 - ~:f'W Ml'rcer Canal to Pleasant_Valley and Lake__~~nal
<br />(SI,..."t~ 11 to 13)
<br />~-lajor flooding occurs in a subdi~ision (See note Sheet 11) upstream of [)nke
<br />Road. This flooding is primarily caused by the limited capacity of the box
<br />cul~ert under Drake Road. There is al so a newly constructed condominium com-
<br />plex in this area which is ina sheet flow area. A large ponding area upstream
<br />of Taft flill Road is caused by the high roadernbankment and the limited cap a-
<br />ci ty of the culvert. Two houses al'e in~ndated by the lOO-year flood with
<br />water depths of up to 10ft. deep at that location.
<br />
<br />Avenlle. This flooding i, ca~sed by the lirnited cdpadty Of tne culvert which
<br />
<br />als() flooded in this area.
<br />
<br />Be4ch 6-Colorado3Southern Railroad to Shields Street (She ets6to9)
<br />The area upstrealTlof the Colorado r,SouthemRailroad serves asa1 argedeten-
<br />tion pond due to the higil elTlbdnkrrent dt the rail rOdd. The flo(}dpl~in widths
<br />s~mctilnes e~ceed 1, 50[)'. A small power substation O\'lned by tile City is in~n-
<br />dated by the lO[)-yearewnt. However. thissubstdtionwill be phased out of
<br />operation'IIithinthenext5to 10 years. Landinthisdetentionare<li,
<br />O....llrd by Col(lrado State University. At Bay Road, the floodplain is still very
<br />\'Iide due co Ule back....ater effects from the railroad. The floodpldin between
<br />Pdthur's Oitch and Shields Street i~ very '.,.ide bec~use of land topography.
<br />
<br />Tile floodplain at the Pleasant Valley and Lake C~na 1 is ~ery wide wi th some
<br />singlc-fdmilyhomes inundatedbythelOO-yedr flood event.
<br />
<br />Re~ch_9 - PJ.eas,,~t_ ValleY_J~,d_ LalLC.aI2e.l....to Study Limit (Sheets )4 to )5)
<br />
<br />:'~ud. "r u,,, r1"oJiny uCCurs ::0dJ, or thE 5tr~a(;It;EJ ~;hEr~ thE 1"nd i5 p~f~~C"-
<br />
<br />lrris reaLh (onsists of J wi~e Shd) low f loo~pld1n rdnglng HI Wldt~ from JUU to
<br />
<br />,.I rlJ' fl dt. A ,~\d 11 box C~ 1 vert apprOXilllJte ly I .20G' do'~ns tl'ea", flU:1I Sh i e 1 ~s
<br />5tre€'t has 1 ittle effect on the lOO-year flood. Th.. wirl.. flODrl..<l ar..~ jll';t
<br />dm'instream of Shield~ Street is cdused I;y water elevations higher than tfle
<br />top of t h ~ ~Io r the rn bar. k 0 f the cree k . Ma s t of the fl 0 0 J w.J te rs f1 01'.' t;l ro ~ gh
<br />
<br />700 feet. Land use is bas i,ally ~gricu1tural with 1 i ttle res idud I development.
<br />
<br />Theoflly structure in the floodrl<lin is a storoge shedapproximiltel y1,508'
<br />
<br />downstream fmm the study limit.
<br />
<br />lh" 5hi,,!,!> 5tn,er. l,,';d~.. 1'1;11, ~ '''>:1,1 flU'; 10" ,.,.~,.t'''I,!,i,,~ 1.1,.. ,.,1",1 '''' I.;,~
<br />
<br />F1oodwai.
<br />He floodway is the channel of a streJm plus any ildjacfnt floodplain area~ c~lrac-
<br />
<br />South side of the Creek.
<br />
<br />terizcd by deep w~tcr unci high vclocity flo\>':; during fleod ~....e~t:;. T~i <: dre.l ml:st
<br />
<br />Rra(;~ 1 - SI!ield:; Street to Nc~'
<br />._-
<br />
<br />:,crccr Can.Jl _\~~ect.s._g to ).1)
<br />--- .--
<br />
<br />bl< kept free of encroachment in o,'der that the 100- y~dr -lood mJY be cOfl'.eyed '.,'i th-
<br />Ollt ~lJbst~ntia) ,ncreases 1" flood neight~ OV"," U'o,e of thr .md1Sf.Llrbed floudpldin.
<br />
<br />l~e f1oodp1ain 1n this reaC1 i~ a;>prcxhately J(l0 ft. ',1ije just '"pstre.lrr of
<br />
<br />Shiel d, Street. In t~e middle dnd upper portions of this redch. Spring Creek
<br />
<br />-21-
<br />
<br />-??-
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