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<br />SECTIO.'J III
<br />
<br />TABLE I
<br />
<br />P.YDP_OLQr,y
<br />
<br />IlESIGI\' POINTS AND BASIN DATA
<br />
<br />A thorough hydrological investigation was cO"lpleted on tr.e
<br />Slaughterhoust3 (;ulch drainage basin.. As require': by the con-
<br />tract, flood hydrographs '",'ere determIned fOT the 2-5-10-100-
<br />year st?rm frequencies. In the hrdrolcglc evaluation, only
<br />the pro) ected land uses "ero co~sldered. Hydrographs .....ere
<br />computed to define the peak rate of runoff at the selected
<br />design points, as ~ell as the volume of runoff characteristic
<br />of the storm frequency and the type of development within the
<br />basin. The method used to compute the flood hydrographs is
<br />the COlorado Urban Hydrograph Procedure. This method is well
<br />ou~lin:,d in the Runoff section of the Urban Storm Drainage
<br />CrIterIa Manual (USDCN) and, t!1ercfore, WIll not be dIscussed
<br />In detail In this report.
<br />
<br />DESICC: PT.
<br />
<br />2
<br />
<br /> REACIl REACfT LENGTH MSDI ;';0. AREA
<br /> m. Sq-:r;fl.
<br />Uppc.r b<<sin limits
<br />" i'o,..ers Park 2.99 1 , 2 1.31
<br />POlI'ers Pnk '0
<br />Conflu<:lnce ,,'jSouth
<br />Tributary O.Gl 3 0.14
<br />South Tributary hasin
<br />lit:1it~ '0 Confluence
<br />wjmain strear:l 1.42 4 0.37
<br />Confluencc 40 :oouth
<br />Platte Rlvtr C.5l 5 O.ZO
<br /> Tot:Jl 5.53 mi. 2.02 sq.mi.
<br />
<br />,
<br />
<br />4
<br />
<br />A.
<br />
<br />DESIGI> POn,TS
<br />
<br />"
<br />"
<br />
<br />To facilitatc the evaluation of intcrmediate points
<br />along the gulch, four design points "ere selected h'lthin
<br />the study area \.,hlch permitted a mOH' "l'tailed evaluation
<br />of the flooding problems ~ithin the basin.
<br />
<br />figure 1 ShOh'S the l'Jcation of the cleslgu l'\Jll\ts "flU th..,
<br />corresponding s\lbh<lsins. Th", basin bcum1:!ries hare been
<br />d:tcrm~n'-'d pr !::\ari 1 r on tl1!" basis of natl:ra~ topography,
<br />fr eld 1 nsp-,c t lon and ~ t on'! sewer l\Jca t luns.
<br />
<br /> TFRL!: 1!
<br /> B.'l.SLN 1'.'.IU\.~:ETE[(S
<br /> CENTHOID
<br />MSIN AREA LF.l\GTH LENGTH SLOPE PROJECT llEVELOPME.\T
<br /> sl)-:r::Jr. Mr. ~~ , fin\'. Ct Cp
<br /> \
<br />1 r. 2 1.3l 2. 9~ 1.52 1.31 60 .30 .50
<br /> 1 a.l.t 0.61 0.34J 1.50 60 .30 .50
<br /> 4 0.37 1.'.2 0.701 1.64 " .29 .49
<br /> 5 0.20 0.51 0.34l 1.77 6~ .35 .47
<br />
<br />T;;ble I proville:; the pll}slc,,-l <lac"- [or eac;, of the glv<.:u
<br />basins and the char.nel rea<.:h bet','een ol1.:h dcstgn poi:'!t.
<br />The peak storm runoff rate \;as computeu for developed
<br />conditions at each design point and is rrovided o~
<br />discharge probability profile c~art~ ~hich ;;ill be
<br />(!iscllssed in a liltcr section.
<br />
<br />E. BASIN PARAMETERS
<br />
<br />To facilitate the computation of the design fJows for
<br />cl1ch ot the storm trequencies. eath basin must be physi-
<br />cally Jescribed in t<:rlr.,; of tributary area, basin leugth,
<br />lengtil to basin centrQid, degree of pcrviousness through-
<br />out t~c.llJsin, a~d the sel<,cti(j~ of otn"T rICp.,.nSf'ntativc
<br />coeffICIents typlcal of the b"-sln. This information has
<br />I,.."" dol"rm.ln",d for each 0: cr.e basins ;IT'.ti is tabubted
<br />in Table 11. ^ II ~he phys ical para:netcrs (, r t 1.e b.15 tl1
<br />have been mea,uI-"d frvm alia lIable US(;S 'llLh;,rang" r.ap~.
<br />1 n f 0 rr.l a t ion 0 nth" de g r,' e 0 f d (' v ,,, 1 0 pr.len t c' x i ~ t i n,~ i nth ("
<br />ba,in, as hell "s tbl' type of d~velorment, ba~ l,.,~n
<br />obtained froI;) a""ilable n",ri:ll photop,r;.phs and nel,,;
<br />inspection. The projected clevelo~ment factors hilve been
<br />determined from information Oil available planning and
<br />7,oningl:'aps.
<br />
<br />-7-
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