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<br />'1'he floodinq of Stanley Aviation CorDora.tion produces most <br />of the direct damaqes in the reach fl,ot:wc,"n 22nd Avenue a.nd <br />StaFleton Airport because of damage" to expensive equipment. <br />Since the upstream channel and c,tora'JE' improvements would <br />reduce the pool elevation of t''le 100'-yeax storm at t:~le I':atural <br />?onding area south of ,;taplet.on Airport from approximately <br />5306 feet to approximately 5305 feet, the natural detention <br />capaci ty was used to its maximllTI' ."xl:ent. In order to provide <br />a flexible future land use in t'lis area, a p'''rmac:lent: detention <br />pond was not designed. To protect t'le S~anley Aviation <br />Corr;oration from flood damaqes, floc:'! pnJofL'lg .thf' buUJ:ing <br />. , <br />lS r: roposea '. <br /> <br />Details of improvements arG_ shovl'n on Ha~:; l:.er P Ian Dra'irlinsf'~;. <br /> <br />~leton Airport G1~ster_ P L~'C_]~:'::.~~\:'.~n(L Nos ~L_.and __~]l.:_ <br />Slnce the '0001 elevation for t'le lOO--year storm at t11.e <br />natural ponding area south.. of Stapl'~:;-~on liirport was :r(~duced <br />by ui.Jstream channel and storage ir'Drover:Kmts, the ov,'rland <br />f low across the runways at St.aple t:on .t\irport was reducec <br />significantly (from 1860 cfs to 130Cl cf,,). T'1ere an= no <br />iml?rovements required at St~apleton ll.:l..rpol:'t .because t;1.e <br />average flo~! depth for the 10G'-year stoOl::"~ event would be <br />reduced from 1 ft to 0.5 ft. <br /> <br />~)ownstream of StajJleton AirI)Ort . (Maste:;- Plan Drawinq No.29 ): <br />The existinq channel between- thE:-j1OX~::i:'--);\lm!ay of Stap-Ieton - <br />Air?ort and Sand Creek does have enol1qh capacity to contain <br />runoff from a lOa-year stoxm event:. l.lso, since ther,,, is no <br />development. planned by Stapleton Airport in 'chis reac''l, <br />drainage improvements ',rere not included J.n this preliminary <br />design. HOvTever, 1:he design dis c.harqes for the lO-year and <br />.LaO-year storm events are listed in TabJcl 9 ::or t.he purpose <br />of combinin~f the channel improvern(?nt \t.7it:~1 the fut.ure development <br />plan. <br /> <br />The flood boundaries for thE' la-year em,] 100--year storm E,vent <br />under exist.ing and improved up" t.rea'11 conditions are s"'own on <br />.the 1'1aster Plan Drawings. <br /> <br />-33- <br />