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<br />j~ "'4t..... <br /> <br />7. Page 53. Why was the date for Temporal Transposition not moved 15 days towards the <br />Warm Season for the 1935 event? <br /> <br />A W A response to Question 7. <br /> <br />The NWS analysis of this storm recognized that the upper air temperatures associated with this <br />event were very cold for the time of year that the storm occurred (end of May) (HMR 13, pages <br />2-5). NWS concluded that this unseasonably cold upper air contributed significantly to the <br />rainfall event but was unlikely to occur any later in the late Spring 1 early Summer season. <br />Section 3.2.3, page 28, ofHMR 51 states "The record-breaking cold air mass associated with <br />this storm could not reasonably occur 15 days later into the warm season. Therefore, the normal <br />procedure of adjusting storms 15 days into the warm season (section 2.3.4) was not applied. " <br />A W A concurred with this conclusion and did not apply the 15-day temporal transposition to this <br />storm, <br /> <br />8. Page 55. Were any additional storm centerings tried for the 1935 storm? Note: It appears <br />that moving the center to the north would result in a higher basin average rainfall. <br /> <br />A W A response to Question 8. <br /> <br />Alternate centering was tried for all storms including the 1935 storm. Moving the 1935 isohyetal <br />pattern northward would move larger rainfall values over the southern end of the watershed but <br />the area of these larger rainfall values was relatively small. The northward movement of the <br />rainfall pattern would eliminate a larger volume of rainfall that had been over and south ofthe <br />Cherry Creek Reservoir. A W A believes that the centering used produced the greatest volume of <br />rainfall within the basin boundaries and that moving the pattern to the north would produce <br />slightly less or effectively the same rainfall volume, <br /> <br />9. Page 62. What does "Pseudo-Adiabatic Method" mean? Note: All other tables are labeled <br />"Total Adjustment Factor". <br /> <br />A W A response to Question 9, <br /> <br />The term "pseudo-adiabatic method" has been used in other studies and is exactly the procedure <br />used in this study. All adjustments made in this study were accomplished using the pseudo- <br />adiabatic method for all storm maximization, transposition, elevation and barrier height <br />adjustments. The Table of Precipitable Water in HMR 55A, Appendix C was used to determine <br />the precipitable water values used in the calculations. The heading to this table notes that a <br />saturated atmosphere with pseudoadiabatic lapse rate used. For consistency, Total Adjustment <br />Factor should have been used on page 62. <br /> <br />10. Page 69. It should be noted that different centers were shown in March 2003 report for the <br />1965 Falcon storm, but the basin average rainfall is the same. Is this correct? <br /> <br />A W A response to Question 10, <br />