BOARD01130

• Board Meeting Date: 1/26/2000
• Description: ISF Section - Instream Flow Appropriations - Water Division 5
• Board Meetings - Doc Type: Memo

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For this segment of stream, one data set was collected with the results shown in Table 1 below.
.Table I shows who collected the data eparty), the date the data was collected eDate), the
measured discharge at the time of the survey eQ), the accuracy range of predicted flows based on
Manning's Equation e240% and 40% of Q), the summer flow recommendation based upon
meeting 3 of 3 hydraulic criteria and the winter flow recommendation based upon 2 of 3
hydraulic criteria.

Table I: Data

Party Date Q 250%-40% Summer e3/3) Winter (2/3)
BLM 7/6/98 1.98 5.0 - 0.8 1.9 1.5

BLM = Bureau of Land Management (I) Predicted flow outside of the accuracy range of Manning's Equation.
? = Criteria never met in R2CROSS Slaging Table.

Biologic Flow Recommendations
The BLM recommended a 2.0, 1.5 and 1.0 cfs summer flow and a 0.8 cfs winter flow based on
their July 6th, 1998, data collection effort and water availability analysis. CWCB staff has
reviewed the data collected by the BLM. The summer flow recommendation, which meets 3 of 3
criteria and is within the accuracy range of the R2CROSS model, is 1.9 cfs. The winter flow
recommendation, which meets 2 of 3 criteria and is within the accuracy of the R2CROSS model,
is 1.5 cfs.

Hydrologic Data

After receiving the cooperating agencies' biologic recommendation, the CWCB staff conducted
an evaluation of the stream hydrology to determine if water was physically available for an
instream flow appropriation. The hydrograph was derived from data collected by the USGS
stream gage for East Fork Parachute Creek near Anvil Points elD #09092960), which has a
drainage area of 14.5 square miles esee Gage Summary in Appendix C). The period of record for
this gage is 1976 to 1983, the period ofrecord used by staff in their analysis was 1976-1983, or
seven years of record. The estimated drainage area of East Fork Parachute Creek upstream of
JQS and Golden Castle Gulch is approximately 3.1 square miles. The drainage area upstream of
Second Anvil Creek is 6.3 square miles. Table 2 below displays the estimated flow of JQS
Gulch at the confluence with Golden Castle Gulch, in terms of a percentage of exceedence. The
blue shading highlights how often the summer and winter flow recommendations have been
available.

Tabel 2: E. Fk. Parachute Ck at confl. W/JQS Gulch & Golden Castle Gulch

Exceedences Januarv FebruaIV March ADril Mav June Julv Aunust Sentember October November December
1% 0,30 0.45 0.74 13.96 60.03 50.65 3.17 1.26 0.65 0.59 0.38 0.24
5% 0,26 0,26 0.62 10.37 36.37 14.11 1,69 0.96 0.49 0.40 0,28 0.21
10% 0,20 0.24 0.58 7.91 26.00 7,48 1.37 0,72 0.41 0.32 0,26 0.21
20% 0.16 0,19 0.43 3.85 20.31 4.49 0.98 0.49 0,30 0.26 0.24 0.19
50% 0.13 0.15 0,21 1.26 8,44 1.56 0.56 0.32 0.21 0.21 0.20 0.14
80% 0,09 0.11 0.17 0.41 0,64 0.30 0.20 0.10 0.07 0.15 0.14 0.10
90% 0.08 0.08 0.15 0,24 0.27 0.13 0.04 0,07 0.06 0.08 0.10 0.08
95% 0.08 0.08 0,13 0,20 0.21 0.Q7 0,04 0,02 0.04 0.07 0,09 0.08
99% 0,07 0.07 0.11 0.17 0.19 0.07 0.03 0,02 0.04 0.06 0,09 0,08

Table 3: E. Fk. Parachute Ck upstream of Second Anvil Creek

Exceedences Januarv Februarv March Aoril Mav June Julv Aunust Sent ember October November December
1% 0,61 0.91 1.51 28,37 122.00 102.93 6.44 2,56 1.32 1.20 0.77 0.48
5% 0.56 0.56 1.27 21,07 73.91 28.68 3.44 2,00 1.00 0.82 0,56 0.43
10% 0.41 0.49 1.17 16,08 52.83 15,21 2.78 1.46 0.83 0.65 0,52 0.43
20% 0.32 0.40 0.87 7,82 41.28 9.12 2,00 1.00 0.61 0.52 0.48 0.40
50% 0,27 0,30 0.43 2.56 17.16 3.17 1.13 0.65 0.43 0,43 0.40 0,28
80% 0.19 0.23 0.35 0.83 1.30 0.61 0.41 0.21 0.15 0.31 0,28 0.21
90% 0.17 0.17 0.30 0,48 0.55 0.27 0,09 0.14 0.11 0.17 0.20 0.17
95% 0.17 0.17 0.26 0.40 0.43 0.15 0.07 0,03 0.09 0.14 0.17 0.17
99% 0.15 0.15 0.22 0.35 0.40 0.15 0.05 0.03 0.07 0.13 0.17 0.17