ISFAPP01475

• Case Number: 05CW0050
• Stream Name: Deer Park Creek
• Water Division: 7
• Water District: 30
• County: San Juan
• Instream Flow App - Doc Type: Supplemental Data

Table 1: Data
Party
BLM

BLM

Date
07/29/2004
10/16/2003

Q
3.32
1.36

250%-40%
1.3 - 8.3
0.5 - 3.4

Summer ~ 3/3)
2.641

1.191
I
? = Criteria never met in R:!CROSS Staging Table.

Winter ~ill~
0.52\1
1.14

BLM = Bureau of Land Management DOW = Division of Wildlife
(I) Predicted flow outside of the accuracy range of Manning's Equation.

Biologic Flow Recommendation

The summer flow recommendation, which meets 3 of 3 criteria and iSI within the accuracy range
of the R2CROSS model is 2.0 cfs (See Table 1). This recommendation was derived by
averaging the results of two cross sections. The winter flow recomm~mdation, which mt:ets 2 of
1
3 criteria and is within the accuracy range of the R2CROSS model is 11.0 cfs (See Table 1). It is
our belief that recommendations that fall outside of the accuracy rangJ~ of the model, ovt:r 250%
of the measured discharge or under 40% of the measured discharge, may not give an accurate
estimate of the necessary in stream flow required.

Hydrologic Data

After receiving the cooperating agency's biologic recommendation, the CWCB staff conducted
I
an evaluation of the stream hydrology to determine if water was physically available: for an
instream flow appropriation. The hydrograph below was derived fi'om data collected by the
USGS stream gage for Animas River at Howardsville, Colorado (IDI #09357500), which has. a
drainage area of 55.90 square miles (See Gage Summary in Append,ix C). The total drainage
area of Deer Park Gulch is approximately 3.7 square miles. The pet10d of record for this gage
was 1935 to 1982, the period of record used by staff in their analysis was 1935 - 1982, or 47
I
years of record. Table 2 below displays the estimated flow of Deer Park Creek at the gage, in
terms of a percentage of exceedence.

Table 2: Estimated Stream Flow in Deer Park Creek
Exceedences Jan Feb Mar Apr May Jun Jul Aug Sep Oct Noy Dee:
1% 1.7 1.5 2.1 14.6 46.6 69.2 49.5 17.9 114.3 10.0 4.2 2.1
5% 1.5 1.3 1.5 9.5 36.8 53.5 37.2 10.4 8.7 5.5 2.8 1.8
10% 1.3 1.3 1.3 6.7 32.4 48.6 30.0 8.7 6.5 4.4 2.6 1.6
20% 1.3 1.2 1.2 4.8 25.8 41.4 21.5 7.1 4.3 3.2 2.2 1.5
50% 1.1 1.0 1.0 1.9 14.5 27.7 10.5 4.1 2.6 2.0 1.5 1.2
'I
80% 0.9 0.9 0.9 1.2 6.8 17.0 5.7 2.7 1.9 1.5 1.1 1.0
90% 0.9 0.8 0.7 1.0 4.8 13.7 4.1 2.2 1.7 1.3 1.1 0.9
95% 0.8 0.7 0.7 0.9 3.5 12.0 3.2 2.0 1.5 1.2 1.0 0.9
99% 0.7 0.7 0.7 0.7 1.6 7.5 2.5 1.7 1.3 1.0 0.8 0.8
1.0 1.0 1.0 1.0 1.0 1.0 1.0
,
,
For this reach, the hydro graph shows that the summer flow recommendation of 2.0 cfs is
available only from May 1 to October 31. The hydrograph also shbws that the winter flow
recommendation of 1.0 cfs is available from November 1 through Apri~ 30.

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