|
<br />Hydrologic Data
<br />
<br />After receiving the cooperating agency's biologic recommendation, the CWCB staff conducted
<br />an evaluation of the stream hydrology to determine if water was physically available for an
<br />instream flow appropriation. The hydro graph below was derived from data collected by the
<br />USGS stream gage for the South Fork of Williams Fork near Pagoda, CO (ill #09249200),
<br />which has a drainage area of 46.7 square miles (See Gage Summary in Appendix C). The total
<br />drainage area of the Big Beaver Creek Drainage upstream of East Beaver Creek is approximately
<br />14.1 square miles. The period of record for this gage was 1965 to 1979, the period of record
<br />used by staff in their analysis was 1965 to 1979, or 14 years of record. Table 2 below displays
<br />the estimated flow of Big Beaver Creek upstream of East Beaver Creek, in terms of a percentage
<br />of exceedence.
<br />
<br />Table 2: Big Beaver Creek Estimated Flow upstream of East Beaver Creek
<br />
<br />Exceedences
<br />1%
<br />5%
<br />10%
<br />20%
<br />50%
<br />80%
<br />90%
<br />95%
<br />99%
<br />
<br />Januarv Februarv March Ami! May June July Auaust SeDtember Octaber November December
<br />2,7 3,0 8,0 81,5 183,1 166,1 34.4 4,7 4.1 6.3 3,9 3,0
<br />2,2 2.4 4,9 42,3 146,7 123,8 17.5 3,0 2.4 4.2 3,3 2,2
<br />2,2 2,2 3,9 28.1 128,1 100,8 12,1 2,5 2.0 3.3 2,7 2,1
<br />2.0 2,0 2,8 16,9 111.2 83.9 7,3 2,0 1,6 2.5 2,2 1,9
<br />1,7 1,7 2,1 7.2 67,0 45.9 3,0 1,3 1,0 1.4 1,6 1,5
<br />1.4 1,5 1,6 3,6 25,6 16.6 1.4 0,6 0.4 1,1 1,2 1,3
<br />1,3 1.4 1,5 2.4 16,0 6,6 0,7 0.3 0,1 0,8 1.0 1.0
<br />1.2 1.3 1.4 1.6 11,8 2,0 0.4 0,2 0,1 0,7 0,9 0,9
<br />1.0 1.3 1.2 1,6 8,8 0.1 0,1 0.1 0,0 0,6 0,7 0.8
<br />
<br />Big Beaver Creek Estimated Stream Flow
<br />u/s of East Beaver Creek
<br />
<br /> 10
<br /> 8
<br /> 6
<br />J!!
<br />u
<br /> 4
<br /> 2
<br /> ---...-----
<br /> 0
<br />
<br />
<br />JAN
<br />
<br />FE33
<br />
<br />Ml\R
<br />
<br />APR
<br />
<br />Ml\Y
<br />
<br />JUN
<br />
<br />Jl1.
<br />
<br />Al..G
<br />
<br />SEP
<br />
<br />ocr
<br />
<br />I\OV
<br />
<br />DEe
<br />
<br />Month
<br />
<br />Table 2 shows that the summer/winter recommendation of 2.9 cfs is only available April 1 st
<br />through July 14th. The summer/winter recommendation was further reduced to 1.0 cfs July 15th
<br />through March 31 S\ based on limited water availability.
<br />
<br />Precipitation Data
<br />Staff reviewed local precipitation data sets from 2 different sites located around the Big Beaver
<br />Creek Drainage (see Precipitation Data in Appendix C). These sites include Meeker 3W and
<br />
<br />- 4 -
<br />
|