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<br />, . <br />. I . , ~ <br /> <br />) <br /> <br />) <br /> <br />PARSONS <br /> <br />Memorandum To Larry Lang <br />January 18, 2002 <br />Page 6 <br /> <br />. Storm positioning at mid-basin neglects orographic effects (p. 14). <br /> <br />. Volume computations from the NWSSS design storm orientation are <br />overstated and not physically possible (p. 18). <br /> <br />. HMR-55A has incorrectly located the 1965 Plum Creek storm, and the floods <br />in Denver caused by the "real" storm occurred a day after the HMR-55A <br />storm (p. 21). <br /> <br />. The barrier effects of the Palmer Divide are physically present, HMR 57 <br />proves they should have been incorporated, and proper analysis would have <br />resulted in a reduction in rain depth (p. 27). This observation was not <br />incorporated in the NWSSS storm (p. 30). <br /> <br />. Rainfall patterns in Colorado tend to have their long axis along the c1oud- <br />layer wind direction (p. 29). This observation was not incorporated in the <br />NWSSS storm (p. 30). <br /> <br />The task of A W A is to prove that these hypotheses are true (most have been proven <br />already), and then assess whether any constitute significant under- or over-statements of <br />the Cherry Creek PMP in the NWS PMP study. <br /> <br />022/ <br />