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<br />Phase II. the final site-specific PMP evaluation, was begun in June 1995 and a <br />draft final report was issued in September '19~l5, A peer review of this repol1 was <br />completed in August 1996 by TRC North American Weather Consultants <br />(NAWC). Phase II consisted of the three steps outlined below: <br /> <br />Phase II: <br /> <br />1. A climatology of historic local /1eavy prlS!cipitation events was prepared <br />for use in identifying key historical rain storms for use in storm <br />maximization and transposition. Additionally, HMS prepared a complete <br />atmospheric description of the sub..cloud and cloud layer associated <br />with these storms including the vertical atmospheric structure. <br /> <br />2. The Mason Reservoir basin wal> visib~d to identify orographic effects on <br />the local storm and general storm prE~cipitati(m patterns in both a <br />qualitative and a quantitative mann4~r due to the basin's hi!9h elevlltion. <br /> <br />3. The site-specific PMP for both local and general storms was calculated <br />using the accepted HMR 55A methodolc)gies and again with <br />modifications for Mason Resentoir's Ihigh elevation using the enhllnced <br />data sets and the HMS Convective Storm Methodology identified illl <br />Phase I. An opinion was offered on the likelihood of an extreme spring <br />snow melt occurring at the same timE! a~5 a PMP event. <br /> <br />This final report summarizes the results of steps outlined above which were <br />completed in Phase II, This report is written within the context of the <br />methodologies normally followed in completin(l a site-specific PMP study and <br />within the context of the helpful peer review rendered by TRC NAVVC, <br /> <br />2.0 Climatological review of historic;~1 storms <br /> <br />The location of Mason Reservoir in the footllills-mountain interface region near <br />Pikes Peak has a strong influence on the storms, both local and general, which <br />are considered for either transposition or for their impact on site-specific PIv1P <br />calculations. The mountainous location of Mason Reservoir necessitates the <br />consideration of orographic influences and assists in narrowing the focus of <br />storms considered. <br /> <br />3 <br />