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WMOD00263 (2)
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Last modified
7/28/2009 2:29:00 PM
Creation date
1/17/2007 2:20:14 PM
Metadata
Fields
Template:
Weather Modification
Applicant
CWCB
Sponsor Name
USBR
Project Name
Response to RFP
Title
Numerical Simulations of Snowpack Augmentation for Drought Mitigation Studies in the Colorado Rocky Mountains
Prepared For
USBR
Prepared By
Joe Busto, CWCB
Date
8/20/2003
Weather Modification - Doc Type
Application
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<br />- <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />,I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />encompass southwestern Gunnison County and parts of Saguache County and Hinsdale <br />County in central Colorado (the upper Gunnison River watershed). With the new <br />programs, approximately 25-30 percent of Colorado's snowfields are now in target areas <br />for cloud seeding programs. The CWCB weather modification permit program website is <br />http://www.cwcb.state.co.us/WeatherModification/Permit.htm <br /> <br />1.2 Denver Water Department Cloud Seeding Program <br /> <br />Western Weather Consultants, LLC began an operational cloud seeding program for the <br />Vail Ski Area during the winter of 1976-77. The Opportunity Recognition Criteria were <br />developed from research findings derived from the Bureau of Reclamation's Colorado <br />River Basin Pilot Project (CRBPP) data. The Vail Cloud Seeding Program has operated <br />each winter for three to five-month periods for 26 continuous winter seasons. Two <br />different ten-year (1986-1995) sets of precipitation data (Snotel and Ski Area <br />Precipitation Data) from the Vail Seeding Program indicate similar patterns and amounts <br />of precipitation increases in the seeded area compared to non-seeded precipitation data <br />from similar sites within 50 miles of the Vail Program. Both sets of the precipitation data <br />analysis closely replicated the seeding expectations indicated from the CRBPP research <br />results utilizing the new Opportunity Recognition Criteria. <br /> <br />The Denver Water Department (DWD), upon hearing of these findings and determining <br />Vail's operational confidence in their Cloud Seeding Program, requested Western <br />Weather Consultants, LLC to expand the Vail Seeding Program to the east and southeast <br />to include the watersheds providing runoffwater directly and through diversions <br />programs to DWD. A network of 38 new cloud-nuclei generator sites and 5 seeding <br />generator sites from the Vail Program provided seeding coverage for the Blue, Williams <br />Fork and Fraser River Basins north and west of the Continental Divide and the Upper <br />South Platte River Basin to the east of the Continental Divide. Figure 2 shows the target <br />areas for operational cloud seeding programs in the central Colorado Rockies during the <br />2002-2003 winter season. This figure shows the DWD, VaillBeaver Creek, and Upper <br />Arkansas WCD programs. <br /> <br />By starting and expanding the seeding activity over the western edge of the DWD <br />drainage basins utilizing the Vail generator network and systematically adding more <br />cloud nuclei to the weather system over the DWD basins, the weather systems appear to <br />experience dynamic growth and an improved precipitation capacity as they move over the <br />downwind basins. This seeding methodology is confirmed by the observed expected <br />increases within the direct seeded areas and smaller precipitation increases immediately <br />downwind (5 to 30 miles) of the direct seeding regions. This seeding methodology will <br />continue for the DWD Seeding Program scheduled for the 2003-2004 winter season. <br /> <br />II-6 <br />
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