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" " , . PARSONS COpy MEMORANDUM January 18, 2002 To: Larry Lang, Joe Busto, and Ed Tomlinson Gary Lewis Comments on Cherry Creek Interim Report No. I From: Subject: I have reviewed the December I, 2001 AWA report titled, "Probable Maximum Precipitation (pMP) Site-Specific Study for Cherry Creek Reservoir" and have the following comments on the scientific aspects. I've answered the five questions and then added a few general observations, Please feel free to forward these to the other participants as appropriate, I will be available at the meeting on the 29th to discuss these and other aspects that arise during the meeting. Responses to CWCB Questions Your instructions requested that I answer the following questions regarding the report, The questions, and my responses, are: 1, Did AWA fUlly address the minimum requirements for each task as defined in the Scope of Work? . Task 1: This task appears to be 100-percent complete if the conclusions have been 100-percent reported, Stated or implied conclusions that I found on pages 1 and 2 are: ~ Use ofHMR 55A and HMR 52 alone, without any additional study or justification, is not acceptable for a site-specific PMP and is in violation of NOAA's CD-I03 (p.l), ~ These techniques (above) were developed for nonorographic regions (p. 1), ~ Additional study should have been done and would have resulted in different, lower values [the latter is implied] (p.l), ~ The PMP rainfall values were increased on the basis of "internal working documents" by 6 to 14 percent (p.l). ~ Rainfall distribution factors were used without scientific analyses (p.l). 022/C:\MY DOCUMENTS\CHERRY CREEK PMPILEW\S COMMENTS INTERIM #LDOC