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<br />At the present time Ihe Oligarchy Ditch fUllClions a. one of the primary .tonn drainage .tructures in
<br />the City, Numerou' 'tonn sewers outfall to rn., ditch. Along va,ious """hes the dilCh capacity fans
<br />helow 2-y""r flow" However. much of the dilch is .llequmely sized for minor stom\ runoff.
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<br /><lirectly into the lake. It is assumed that Mcintosh Lake has ,deqoale eapxity 10 detain the entire
<br />runofffromlhe2-yearevenl. Thlls. for lhc pllrpose' of this sludy, <lischarge' fromlhe lake to the
<br />Spring Gulch or Oligarchy Ditch Basins during minor storm events have not heen included in the
<br />model.
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<br />3. ROUOH ANDREAOY DtTCH BASIN
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<br />(; WF.STHOVER BAStr-;
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<br />The !lough and Ready Ditch Basin includes areas from casl of the Oligarchy Ditch Ba,in to rhe
<br />eastem boundary of the MSA (see Drawing' I and 3), Willi cme exception at the northeast COrner
<br />of the MSA. all of the Rough and Re!l<ly.uh.ha'insdramtotne Rwgh and Re!l<lyDiteh. Thcditch
<br />outfalls W the Oligarchy DilCh eaM of III. golf COUrse alld north of Highway 119.
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<br />The West Hover Basin lie. near Ihe nonhea't corrlCl of the study area (see Drawing I MId 3).
<br />Approxitn.'ltcly one-third of lhis basin dmins to Flirch Loke nonhwe,! of Hygiene. Within the MSA,
<br />the Westllover ,ub-hasins drain the area north of St. Yrain Creek. 'oulh of Mcintosh Lake. and from
<br />the MSA hound.ry easl to beyond Sun.et Slroet. Three <eparate sy'tem,wel"l: identified as draining
<br />this area.
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<br />For this Mudy ilis....umed that the Rough and Ready sub-basins draindircctly to the UnionS..in
<br />described below. Given lhat the Rough and Ready ditch has a small capacity for carrying stormwater
<br />lllllUff. it is e,';nWtoo Ihat dUrin~ periods of irrigation, ,{Orm runoff will overtop Ihe ditch and flow
<br />to Iheen,!. l.ltheprcsem lime scveralsmall SlOrm sewers ,ystemsoutfall lO >fl" ditcll, and it is
<br />",sumed that unly for minor evem, and during period, of low or no irrigation flow will Ihe Rough
<br />and Ready and Union Basins be hydrologkallylhydrauli~al1y indepelldent. The cxi'ting SYSlem and
<br />relatcdo"umption,.refunherdiscu,se<linthcAltcrnati,'cs Evaluation Report.
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<br />7.ST,YRAINBASINS
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<br />4.UNtONBAStN
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<br />Various nasin, adjacent and draining toSt. Vrain Creck (excluding the East $1, Yrnin Basin) have
<br />becn de,ignated thc St, Vrain Basin (,ee Drawing 3), Threc ,mall dra,nagc systems within this ba,in
<br />with outfall, to SI. Vrain Creek were idcmified, while the remaining ,ub.ba,ins wcre assumed to
<br />drain direclly to St. Vrain Cr~'.:k, All of the SL Yrnin Creek ,un.b,lsins di'cussed in ilIi. repon lic
<br />within the LPA.
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<br />The lJnion Basin lies alOllg 'hcea,t bordcr of the study area and i'draine dby East Spring Gulch (see
<br />Draw;"g 1). Ea"t Spring G"lch "utfalls to S1. Yra;n Creek cas! oflhe LPA. At Ihcprescnt time lhe
<br />basin i, I.rgely uodeveloP<><l. althoogh most of the basin lie, within the LPA nod is expected to
<br />undery,odevclopmenlinthcem"ingyt'ars A'notedaoove. for modelling purposes. the Rough and
<br />Ready snb"basin. arc a"umoo to drain direetly into the UnionSasin,
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<br />H. LYKIr-;SG1U'HBASIN
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<br />5, McINTo..~1l LAKE BA.tr-;
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<br />The Lykins Gulclt Basin drains hOlH alung the foothills "ear Highway 36 and elller, the M5A
<br />between St, Yrain Creek and Nel.on Ruad (see Drawings 2 and 4), Apprn<imately <)(l p"o,ent of thi,
<br />basin lies ullt.ide of Ihe MSA. Within tbe MSA, excluding the Airport ^nnc_, Lykins Guloh is
<br />divided into six ,ub-b..il" eIIC"mp""ing 1.790 acres thai uutfall to $1. VrainCl"I:ekalPrallPJrkway
<br />The Lykins Gulch Ba,in is typificd by a lack r>r. defincd drainagc channel in several areas due to
<br />local,gricullulal"clivilies.
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<br />Areas drain"'g to Mcintosh Lake were designa[oo the Mclmosh Lake lias," ('ee Drawings I and 3),
<br />The m'jority "fthis Ila"in he, rnJl<idcoflhe LPA. and unly one notable ~ffsitedetention hasin was
<br />idc"tir",d S"ver,,1 .ub.ba,;ns wer~ dellnt."<I wilhm tile LPAIMSA. all "f which Me a.sun,e<l to drain
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