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FLOOD08366
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Last modified
1/29/2010 10:12:02 AM
Creation date
10/5/2006 3:33:06 AM
Metadata
Fields
Template:
Floodplain Documents
County
Douglas
Arapahoe
Community
Greenwood Village, Aurora
Stream Name
Cherry Creek
Basin
South Platte
Title
Probable Maximum Precipitation Study for Cherry Creek Reservoir - Contacts and Meetings
Date
4/21/1972
Prepared For
CWCB
Prepared By
CWCB
Floodplain - Doc Type
Project
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<br />-2, <br /> <br />Maintenance funds proposals for Federal Fiscal Year 04, The language in the House Committee Report <br />should include the latitude for the Corps' to conduct PMP and PMF Technical Reviews, <br /> <br />Presentation by Ed Tomlinson, Applied Weather Associates: <br />The Tomlinson and Henz PowerPoint presentations are attached but a presentation summary follows, Also <br />included are dialogue and comments from meeting attendees, <br /> <br />Bill Miller, USACE: asked about the congressional efforts taken by CWCB and others regarding funding, <br />Should language be added to the House report that can be implemented in the Ff 2004 budget? Larry agreed <br />to discuss this in an hour or so, <br /> <br />Ed Tomlinson, A W A: stated that he is very proud of this study and made no assumptions without validating <br />them with data and analysis, He compared NWS results to the A W A results, Tomlinson showed a colorful <br />terrain map ofthe Palmer Divide, including the basin outline and the influential moisture inflow barrier <br />ridges, The Palmer Divide's highest elevation is 7,700 feet, and the lowest elevation is 5,500 feet on the north <br />side, and 5200 feet on the south side, There are multiple ridges on the north side of the Palmer Divide, The <br />combination of the Palmer and Kiowa barriers are the highest features, Tomlinson showed a 3-D map for the <br />Cherry Creek basin looking to the north with the radiating inflow lines, Tomlinson showed a 3,D map looking <br />to the south of the basin, including barriers and inflow wind lines, <br /> <br />Tomlinson gave the definition ofPMP with emphasis on the "physically possible" concept for the Cherry <br />Creek basin. <br /> <br />"Theoretically the greatest depth of precipitation for a given dnration that is physically possible <br />over a given size storm area at a particular geographic location at a certain time of year" <br /> <br />Major issues that A W A identified were: "physically possible" All assumptions must be meteorologically <br />consistent. Storm characteristics must be consistent with extreme rainfall storms in Colorado regarding <br />particular geographic locations, Topographic effects on rainfall production, storm rainfall pattern orientation, <br />storm centering, moisture depletion by the upwind barriers "given size storm area" and spatial characteristics <br />of Colorado storms, Tomlinson went over the major issues of the PMP study; assumptions must be <br />meteorologically consistent; storms used must be consistent with Colorado storms; topographic effects of the <br />Palmer Divide; storm rainfall pattern orientation; storm centering; moisture depletion by the upwind barriers; <br />spatial characteristics of Colorado storms, Project objectives were to review ofNWS site,specific study; have <br />the A W A team conduct a site,specific study and compare the results of the A W A team and NWS study from <br />1995, <br /> <br />In the review ofNWS study; HMR 52 used spatial rainfall patterns from storms not like Colorado storms; <br />HMR 55A PMP values could not be reproduced because of the lack of data, Ed Tomlinson also concluded <br />that K,factors that increases rainfall amounts should not be used for the downslope terrain into Cherry Creek. <br />Tomlinson showed the comparisons of the 1995 NWS study and the 2003 A W A study PMP values, <br /> <br />Three factors were found in the A W A team PMP study results; moisture depletion by the Palmer Divide and <br />Kiowa barriers; spatial distributions of extreme rainfall; orographic effects within the basin such as <br />downslope winds in the basin - affects on the k,factor, <br /> <br />HMR 55A reproduction: CWCB Freedom of Information Act used at the request ofthe National Weather <br />Service as a formality, A W A reviewed HMR 55A for additional information and concluded that insufficient <br />information was given to reproduce the 1995 NWS Site Specific PMP Study values, A W A used storm data <br />from 10 extreme Colorado storms, <br /> <br />Flood Protection. Water Project Planning and Finance. Stream and Lake Protection <br />Water Supply Protection. Conservation Planning <br />
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