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^:.~ l7=ACTCFS <br />_' ~'.EEaS <br />..._.~_~FE?5 <br />G1ORRISON-KNUDSEN COMPANY, INC. <br />-O_C+1-rM_JSEN V~_a1,q ' <br />~~d'9:9~oG5E IO~Mf, 9PP_/L'S.A <br />~. •c..2:E1 i96iJOC "ELE:c: J69i.i9 <br />Se,tember 11, 1986 <br />t;.. D.J. Rose <br />c~; -~~•ations Manager <br />Y~T~.3 Hieing Ccmp any <br />F.O. Box HH <br />ti.!;'en, Colorado 81639 <br />Daar Hr. Rose: <br />Subject: Tipple Pond B Storage Capacity (Cutfall 007) <br />• T hove reviewed the design calculations and as-built water stied survey <br />d-.ta for Pond "B" located at the Tipple Area of the Hayden Gulch Hine. I <br />~_:;. a registered Professional Engineer in the State of Colorado and am <br />nxt;:±ri.enced in the design and construction of water control s~ructures. <br />:..~ purpose of the review was to detern.ine the effect:-, if any, of the <br />..~ bui.lt water shed survey information on the design capacity of Tipple <br />i;:'.:d "B". Using the original design formula with the as-built data, <br />_a._cul.:tins indicate a 25-year, 24-hour store event would result in 1.57 <br />,..a !::_et of watec in Pond "e". This combined with 0.16 acre feet of <br />~cuir.:nut capacity 'yields 1.73 acre feet of storage capacity needed to <br />cu:aailt a 25-year, 24-t.oar store event. A recent as-built .:urcey of Fond <br />"3'- indicates a maximum storage capacity of 2.17 .acre feet. <br />.c is i.n my opinion, b..~ed un the original design assumptions and as-built <br />;iata, that ripple Fond "B" will cent:: in tt:e r.:noff from a 25-year, 24-hour <br />:,;:or:n event with a 1 foot rainir.~Jm freeboard and no discharge. `.7ith this <br />'.nEo~;natiun and pa:~ construction certification, this Pond should meet the <br />CRLEi) regnir~ments. <br />t~c`~r~E~cT ~ ir~'~.. <br />.,_ , .. <br />',~~;n O'Laughlin - 'olorado Re~i~Jfci-ed~E.'.'L ttJ~~.1:342. <br />~ Jigs .c`~ ~~ <br />c''~ `~ . <br />r ov. ~~ ~ <br />JC'./lab '. f tej: f w~;'. ~• <br />' ~~ r {..~ ys ~ <br />2000h ~"cerrr„r~,,,~ <br />IL- IA,'~ <br />