WMOD00268

• Applicant: CWCB
• Sponsor Name: USBR
• Project Name: Final Report Weather Damage Mitigation Program
• Title: Numerical Simulations of Snowpack Augmentation for Drought Mitigation Studies in the Colorado Rocky Mountains
• Prepared For: USBR - WDMP
• Prepared By: Curt Hartzell, Dr. William Cotton, Joe Busto
• Date: 9/1/2005
• State: CO
• Weather Modification - Doc Type: Scientific Study

The OW 2003-2004 Program conducted cloud-seeding activities on 29
winter orographic cloud systems over portions of 75 calendar days for a total of
14,768 seeding hours. These operational cloud-seeding events are listed in
Table 2.1. The average seeding rate was 8.45 grams of silver iodide (Agl) per
seeding hour, which was a 43% increase in the average seeding rate from the
OW 2002-2003 Program. The reason that a 50% average seeding rate was not
achieved was because WWC's cloud-seeding activities for the OW Program's
2003-2004 winter season were skewed towards more frequent and longer
operations during the colder portion of the winter season when lighter seeding
rates are normally used. Figure 2.2 is an example of a WWC generator site used
for both the OW Program and the Vail/BC Program. The generator is in an
exposed location that should allow the low-level wind now to transport the Agl
seeding nuclei toward downwind higher topography with orographic clouds.

Figure 2.2. WWC seeding generator site V1, elevation 7,088 ft, looking SE.

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