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Last modified
7/14/2009 5:02:36 PM
Creation date
6/1/2009 11:56:52 AM
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UCREFRP
UCREFRP Catalog Number
9505
Author
Cooper, D. J. and C. Severn.
Title
Wetlands of the Escalante State Wildlife Area on the Gunnison River, Near Delta, Colorado
USFW Year
1994.
USFW - Doc Type
Hydrology, Water Chemistry, Vegetation, Invertebrate Communities, and Restoration Potential.
Copyright Material
NO
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Table 2. Mean and standard deviation of number of days with <br />flows equalling or exceeding 10,000, 15,000 and 20,000 cfs during <br />the three sample periods of record. <br />>10,000cfs >15,000cfs >20,000cfs <br />1897-1965 21.$ (19.5) 7.1 (10.1) 2.2 (5.0) <br />1966-1993 5.7 (13.4) 1.3 (5.0) 0.2 (0.9) <br />The data in Table 2 indicate that the pre-dam period had, on <br />average, a period of 3 weeks each year with flows greater than <br />10,000 cfs. The post-dam has, on average, less than 1 week of <br />flows greater than 10,000 cfs. The pre-dam period also had, on <br />average, a period of approximately 1 week with flows greater than <br />15,000 cfs, while the post-dam period has one day per year with <br />these flows. The frequency of days with flows greater than <br />20,000 cfs is 10 times as great in the pre- vs. the post-dam <br />periods of record. We-were in the study area on 1 June 1993 when <br />the daily average flow was 15,300 cfs. Overbank flooding was <br />occurring on this day. We do not know the exact flows that cause <br />overbank flooding in the study area, but estimate that <br />approximately 12,000 to 15,000 cfs will cause overbank flooding. <br />Using Table 2 we estimate that overbank flooding would have <br />occurred, in the pre-dam period, an average of 7 days per year. <br />However, Figure 4 indicates that flooding would not have occurred <br />annually,, and when it did flooding may been sustained for 2 to 3 <br />weeks. The maximum flow for 1993 was 20,500 cfs on 18 May. <br />Years with one day with flows over 20,000 cfs occur in the post- <br />dam period once every 5 years. Thus, the 1993 flows were <br />extraordinary. Figure 2 indicates that total flows during the <br />1993 water year were the 4th largest since 1957. <br />8 <br />
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