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<br />UNITED STATES DEPARTMENT OF AGRICULTURE
<br />SOIL CONSERVATION SERVICE
<br />P. O. Box 17107, Denver, Colorado 80217
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<br />S€P02197(J
<br />DOt COLO, W~TER
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<br />OARD
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<br />September 1, 1976
<br />
<br />Mr. Larry Lang
<br />Colorado Water Conservation Board
<br />823 State Centennial Bldg.
<br />1313 Sherman St.
<br />Denver, Colorado 80203
<br />
<br />Dear Mr. Lang:
<br />
<br />We are attempting to finalize the peak flow-frequency data for the San
<br />Juan River - Pagosa Springs Flood Hazard Study. As agreed to in our
<br />telephone conversation August 30, I am sending you statistical compu-
<br />tations for the streamgage at Pagosa Springs. I have attempted to
<br />follow procedures as outlined in Water Resource Council Bulletin 17
<br />with the possible exception of considering outliers. There were no
<br />outliers considered in the data; however, a regional skew factor was
<br />developed which has the effect of reducing the impact of extrem_e "ev:~
<br />such as occurred in 1912. He plan to alsouse the same ;;E,g{onal" skew
<br />-factor in a similar manner for the two upper streamgages on the San
<br />Juan River.
<br />
<br />We would appreciate your review and comments pertaining to this analysis.
<br />
<br />Sincerely,
<br />
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<br />;:-./,V1...k.:.~xJ:'i' {/J~~~
<br />S. Glade Wilkes
<br />Hydraulic Engineer
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