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<br />URS <br /> <br />MEMORANDUM <br /> <br />To: Rich ,\IUll)'. Pikes Peak Area Council of Gun'foment" and Thomas <br />Bro\\ ning. Colorado Water Coosenalion Board <br /> <br />From: William Abpach, PE <br /> <br />Dale: 17 ~larch 2006 <br /> <br />URS ~'o.: 21711534 <br /> <br />Subject: Fountain en'el\. \\'~Itershed Supplemenlalll)'drolog)'. 6-hr Storm ~Iodeling <br />and Confidence Intl'n"als <br /> <br />URS is pleased 10 submit this memorandum summarizing our work to perform <br />supplemental hydrolog.y analysis in support of the Fountain Creek W,lIer:-.hed study. The <br />objectives of this work were to develop the model input data for a 6-hr storm/rainfall event tu <br />compare with the initial hydrology results originally prepared in 2005. and 10 calculate <br />confidence imcn-als for two Fountain Creek tributaries. <br /> <br />This work included the following tasks and activities: <br /> <br />Ta~k I - Dl'Hlop 6-hr slorm input data for IIEC-IL\IS <br /> <br />Thi.. ta"k induded gathering information and developing a temporal di"tribut]on for a <br />synthetic 6-hr slorm event with uniform spatial di"trihution for inpUl into HEC-H.\1S hydrologiC <br />Illodels. <br /> <br />T,ll.o;k 2 - I>en~lop Confidence Intenals for Select Sln',Im Reaches <br /> <br />This task included developing 9Yk confidence inlervab for peak di..chargc results from <br />the e.xistmg conditions. HEC~H.\tS models for the waler"hcd.. listed in Table 2. <br /> <br />Tahle 2 <br />Confidl'nce l.e\'('1 Slream Reaches <br /> <br />Rer Slream Reach <br />No. <br />I Cotlonwooo Creek <br />, E<lsl Fork Sand Creek <br /> <br />L'RSC''l'J''.>raIHlfl <br /><Nnl.11'L'\kral DfHC. '>UllC _\m <br />'01,'uJ" Srn"ll', en ~(I'I21 <br /> <br />1'\217] I ~l':\Rc,>ulL, tc-.:h mcmo O,lllt> J{>( <br />