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<br />F. <br /> <br />Within the MSA. proposed improvemems for this basin are ,!Orm sewers to convey 2-re,., <br />runoff from areas cas! of A;rport Road and soulh of RUlgC" Road 10 an outfall allhc: Golden <br />Pond, (see Drawings 7 and 9). This system will include pi!",s from 30 to 7R inche.;n <br />diameter. Smrm sewer alignments will be gcneraJly along Airport Road, the Denio/Taylor <br />and Mill Oitche" and Fordham S"CCI (0 the outfall. This system will ,cmove StOrm runoff <br />from irrigalion facililics and provide an outfall for the Brickyard Dclcntion Pond. <br />LYKINS GUI.CH BASIN <br /> <br />, <br /> <br />LPA lmprovcmom, <br />II is proposed Ihm a chanllt:l be conslructed from Airport Road 10 SI, VrainCrecktoconvey <br />upper-basin lOO-year runoff to Ihe creek (.ee Drawing 6). Thisdiversionwillgrcatlyrtduce <br />facility requircmcnls within lhe MSA and in thc area between Hover Street and Airport Road. <br />The chao",,! .hould be sized to accommodate arpro~imaldy 3]00 cfs from the south crossing <br />of Airpo" Rood, design l"'io1376, and noo cfs al lhe north cTO<<;ng of Airport Road. <br />design poinl J77 (see Drawing 2). <br /> <br />I <br /> <br />For the uca oflykins Gulch Basin between Airport Road and HoverStrcet ,appropr;ateIOQ. <br />year improvements should be incorporated imo lhe design of fmore developmenllO maintain <br />runoff at hisloric mles. The oUlfaJl of such faci1ities lhould bc acrOsS Bove, Street, through <br />the Boulder County pood .nd to SI. Yr.io Creek as shown 00 Drawing 9. To impleme'lt this <br />sySlem.'pproval fornse of the pond as a eonv")'aoce 'tructnrewill need to lx: obtained from <br />BonlderConnty <br /> <br />2. MSA Improve,,,,,n,-, <br />Subsequent to development of the Alternative, Evaluation Report a storm sewer 'y'lcm was <br />uo"slrucl<:dinlheSutlSClStreet.B"'IOnAycoueal'ea. Atth;stio,e"oa<Jditional'lructural <br />imprm'emCnls are =ommended ror lhis ba.,in. However. in view 'haL the Island Ditch is <br />pre,enlly us<'<! as 3 SWm drainage facility. and.1I dIe Ci,y antidpilte' this function [0 <br />eontinoe in lhe fu'ore, it is re\:ommended that lhe City se,ure tbe perm~nent u.e of tbi, di'ch <br />for runoff mana~emenl. <br /> <br />" <br /> <br />G <br /> <br />DRY CREEK NO. I BASIN <br /> <br />I. lipperBas;n/LPA Improvement! <br />Detention faciht;es w;1I be needed in ,h. Dry Cr.ekNo, 1 Bas;n torednce run<>ffr~tes 10[1te <br />capacity of the e,i"ing dr~in"ge f~eiiities downstream of Hove, Strcet, <br /> <br />The available flood ltoragecapacityofSlecleLakes and tile lagennan,LeftHandandClover <br />Sa.in reservoirs dlrough reservoir rouling should be ,ecured tbrooghagrecment' with the <br />reservoir openlo", li,e of the~e fac;litie, will reduce tbe detention volume requirement' for <br />regional facililies within the LPA, <br /> <br />It is proposed that ncw rcgionaldctcntion faciliticsbeconslnJClednpstre am of Airporl Road. <br />Relea.'<e' fromthcs. facihticsshould regulate lIowsin Dry Creek No. I soehlh.l lOO.year <br />peak lIows down'tream of Hovcr Street do noteweed2.JOOcfs. thecop3cily of,hedot,blc <br />lO'~ 10' bo~ culverts downstream of SunSCt Street. II is estimalCd t~at 360 acre-feel of <br />delcntion capacily with a ma~imum controiled relca'e rate of 840 cfs will be required <br />upstream of A;rport Road. fn addition. 8 ,lere.feet of delention c~pacity with a maximum <br />controiled release",e of 160cfswiii be re4uired upstream of Hover Street to produce me <br />recommended fiow rate, This detenlion would be locmed in Sub.basin' ND3 and ND6. <br />These den:1l1ion/release value, were computed wilh the a,sumption mal existing flood <br />detention e-'pacity of uppet.bosin ;nigaUOn re'erv",rs will bc secured, Thc proposed <br />T'CilC,voirs ~re .i1-<:d La anennate peak fl"w~ ~nd as <lored volume e,eeeds me value$ <br />presentcd above. !pUlway relca,es 3re presumed 10 occur. <br /> <br />, <br /> <br />.\.1SA Impwvements <br />Within lbe MSA. lwo 2-ye.r storm sewer system, arC propo,ed. As shown on Drawillg 11. <br />a 36.inchand 48-inch ,ewc, i,proposedtodrain ,Ile NcI'on Road area to DryCre<:k No. I. <br />and a 54.inch ,ewer" propo!<-'<I aioug Hover Slreet between Clo"er Basin Drive and [ftc <br />creck, <br /> <br />!~ <br />