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Last modified
7/28/2009 2:29:16 PM
Creation date
7/18/2007 11:59:25 AM
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Weather Modification
Title
Evaluation of Winter Cloud Seeding Effects on Snow Water for the Colorado River
Prepared For
Southwestern Water Conservation District, Durango
Prepared By
Steven M. Hunter, Bureau of Reclaimation Technical Service Center
Date
7/11/2006
County
La Plata
Weather Modification - Doc Type
Report
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<br />Tuget.control dSWE dlnerence' In" <br /> <br /> .. <br /> "" <br /> "" <br />. <br />I .. <br />, <br />. <br />" <br />t <br />I .. <br />l <br /> .00 <br /> 0 <br /> .'00 <br /> <br />, .. <br /> <br />S~'5 <br />. .Lcr"..ctrI... I <br />.Li>c rgHlr'''' <br /> <br />" I <br /> <br />., <br /> <br /> <br />" <br /> <br />" n <br />.. - <br /> <br />~. <br /> <br />Figure 4. Control area dSWE values subtracted from those of the (San Juan) larget area, expressed as <br />a percentage of the target dSWE. The dSWE values are the 24 hr integrations from SNODAS, as in Fig. <br />3. Positive (negative) percentages indicate more (less) snow precipitation in the target area relative to <br />the control area. Some bars exceed the range of y-axis the plot, so actual percentage difference values <br />are indicated near each bar. <br /> <br />signal (if any). Maps of 24 hour dSWE for each seeded day arc included in an associated <br />spreadsheet (Attachment B). Table 1 provides brief summaries of dSWE patterns in those maps. <br /> <br />The study area in southwest Coloradn was exceedingly dry through early March. The SNOTEL <br />basin average SWE through this perind was less than eight inches, but by early April it duubled <br />to nearly 17 inches (San Miguel, Animas, and San Juan River Basins). The accumulated SWE as <br />a percent of average peak SWE in these basins increased from 6% to 31% during this month. <br />long period. Therefore, while still unusually dry overall, the March storms were the heaviest of <br />the winter and were critical to improving water supplies in the region. It should be noted that <br />Mareh was also the period of the seeding extension. Seven of the ten days in March showed <br />more dSWE in the target area compared to the control areas (Fig. 3). Again, however, t<lrget vs. <br />control differences in terms of percentage (Fig. 4) arc too great to attribute to seeding. <br /> <br />IV. SUlIIlIHlry <br /> <br />il. Conclusions <br />For the primary variable of this study, we used 24 hour SNODAS dSWE, areally averaged over <br />the target and control areas, as a proxy for snow precipitatiun. The results did not indicate any <br />systematic increase or decrease in dSWE in the target vs. control areas that might be attributable <br />to WWC's cloud seeding. It appc<tred that the principal controls on spatial dilferences between <br />the target and control area dSWE were the trajectories, speeds, and internal snowfall variations <br />of the winter st()rms that produced the total dSWE across the region. If there were seeding- <br /> <br />H <br />
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