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• Board Meeting Date: 5/21/2008
• Description: ISF Section - Injury with Mitigation - Case No. 5-07CW210; Application of Vail Associates, Inc. and the U.S. Forest Service
• Board Meetings - Doc Type: Memo

Linda J. Bassi April 29, 2008
Page 7
Eagle River, which is approximately 4 miles downstream from the proposed Tea Cup
Bowl Well. The stream cross section and flow analysis at this location was conducted by
the Division of Wildlife on July 27, 1977 and the flow was measured at 5.95 cfs. The
winter flow conditions are considerably less than this. Flow measures conducted by
Hydrosphere on January 19, 2007 found a flow of 0.35 cfs in Two Elk Creek at Tea Cup
Bowl and 2.33 cfs at the mouth. The maximum impact of the proposed Tea Cup Bowl
Well on the 2.33 cfs flow level would be less than 1%.
Figure 5 shows the reconstructed average monthly flows in Two Elk Creek at Tea Cup
Bowl based upon the Wearyman Creek Gage for the 1964 through 2005 period of
record. The average monthly streamflows during the proposed pumping time period of
November 1 St through December 31 St are well below the 4 cfs. Therefore, it would not be
possible to fully protect the 4.0 cfs flow rate with any amount of water diversion during
the snowmaking season.
+streamflows by Correlation with Wearyman Creek fCWCB 4.0 cfs ISF water right
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figure 5. Average monthly reconstructed flows for Two Elk Creek
at Tea Cup Bowl (1964-2005 period of record).
During the months of November and December, the 4 cfs instream flow controls and
preserves up to 488 acre-feet per year (4 cfs x 2 of/cfs/day x 61 days). The one acre
foot annual limit on diversions from the Two Cup Bowl Well is 0.2% of the decreed
instream flow. As shown in Figure 5, the average flows in Two Elk Creek during this
time period below the Tea Cup Bowl Well are estimated to be 1.25 cfs in November and
1.05 cfs in December. This amounts to 75 acre-feet and 65 acre-feet, respectively. The
one acre-foot annual limit equals 0.7% of this estimated flow. In this regard, the Tea
Cup Bowl Well has no greater impact than an exempt domestic well.
AMEC Earth and Environmental, Inc.