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Last modified
7/28/2009 2:29:19 PM
Creation date
7/18/2007 2:18:33 PM
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Weather Modification
Title
Applied Weather Associates Responses to Corps of Engineers Questions on the AWS Study of Cherry Creek PMP, Sept 2006
Prepared For
USACE
Prepared By
Applied Weather Associates
Date
1/29/2007
County
Douglas
Weather Modification - Doc Type
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<br />Ji"i' #<~. <br /> <br />almost straight line with very significant envelopment between area sizes of approximately 2,000 <br />square miles and approximately 50 square miles, The envelopment curve could have also been <br />drawn much closer to the data points, producing a much more concave upward shape between <br />2,000 and 50 square miles, The envelopment curve that was drawn attempted to follow the <br />shape ofthe 1921 storm curve below 2,000 square miles while providing a smooth transition to <br />the 1935 storm curve, Note that the envelopment curve is much closer to the shape ofthe 1935 <br />storm curve than to the convex upward shapes of the other storms. Undercutting ofthe 1935 <br />storm curve was a possibility if priority had been put on maintaining the curve shape ofthe other <br />storms. However, the decision was made to not undercut any storm data while still providing as <br />smooth a transition from the other maximum storm data at various area sizes as possible. The <br />resulting curve is concave upward with an inflection point at several hundred square miles. This <br />shape seems to provide the best envelopment curve that envelops all maximum storm data while <br />providing a smooth transition among values at different area sizes. <br /> <br />25. Appendix B. Where are the results ofthe HECI modeling that is described in Task 5 and <br />Task 13? <br /> <br />A W A response to Question 25, <br /> <br />Flow Technologies provided flood modeling analyses and presented results at the second <br />Technical Review Committee meeting. Attached to end ofthis discussion are some ofthe <br />products that Flow Technologies provided at the review. A W A is contacting Flow Technologies <br />to ensure that the products provided are complete since A W A did not retain a complete copy of <br />the Interim Report #2 in the project file. <br /> <br />26, appendix G, Response to NWS Comment 2. Where is the data for the Spring Brook MT <br />storm? <br /> <br />A W A response to Question 26. <br /> <br />The storm information used to compute the total adjusted values was taken primarily from HMR <br />55A. The storm date and rainfall values came from the Storm Depth-Area-Duration table in <br />Appendix B, page 233; the storm dewpoint and maximum dewpoint values were taken from <br />Table 5.1, page 85; the transpositioned maximum dewpoint was determined using Figures 4.10 <br />and 4.11, pages 79 and 80; and the storm location and elevation were taken from Table 2.2, page <br />18, Information in Section 2.4.1.3 was used to develop an understanding of the storm <br />characteristics but no storm data were taken from this discussion. The transposition maximum <br />dewpoint location was determined using DeLorme mapping software and the location reference <br />direction and distance from Table 5.1 (370ESE). Precipitable water values were determined <br />using the Tables in Appendix C ofHMR 55A. The barrier height was determined using the <br />barrier heights for other storms with similar inflow moisture wind direction in Section 4 of the <br />Final Report. <br /> <br />Over the last couple of years, A W A has developed spreadsheets to compute each of the <br />adjustments made during the maximization, transpositioning, elevation adjustment and barrier <br />
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