WSPC12741

• File Number: 8064.200.A
• Description: Indian Water Rights - Gallup-Navajo
• Date: 9/3/2004
• Author: USDOI/BOR
• Title: Biological Assessment, Navajo Gallup Water Supply Project - Report and Appendices
• Water Supply Pro - Doc Type: Publication

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Table 3.9 Flow Recommendation Primary Statistics Compared To Baseline and
Maximum Impact NGWSP Statistics

Recurrence Frequency
>10,000 cfs for 5 days 20.0% 27.7%
>8,000 cfs for 10 days 33.0% 38.5%
>5,000 cfs for 21 days 50.0% 50.8%
>2,500 cfs for 10 days 80.0% 80.0%
Maximum Years Without Meeting Criteria

27.7%
38.5%
55.4%
80.0%

> 9,700 cfs for 5 days 10 10
> 7,760 cfs for 10 days 6 6
> 4,850 cfs for 21 days 4 4
> 2,450 cfs for 10 days 2 2

10
6
4
2

Table 3.10 Change in Average Annual Streamflow from Baseline to Maximum Impact
Configurations at Five San Juan River Gages

.. .Change'.. c~cf~.~.}c::,..:.~~-:;-;c-~'~f'Arc1iljie~lccJ=arn1ingtoif~.SlliP_1.~t.-.=biit'-CO"iHIi~~;;~Brlitf
Average monthly - cfs 42 41 -8 -5 -5
Maximum monthly - cfs 81 64 26 29-54
Minimum monthly - cfs 0 3 0 -9 -1
Average monthly - % 5.5% 2.8% -0.5% -0.3% -0.3%
Maximum monthly - % 3.6%; 1.6% 0.6% 0.6% -0.9%
t",1inimum monthly - % 0.0% 0.6% 0.0% -1.5% -0.2%

\Vhen the sum of annual depletions from :\IIP and ALP reaches 290,000 acre-feet, it is proposed
that total depletions in the basin be monitored and reported by the SJRIP Hydrology Committee
every 5 years until the baseline depletion is reached. At that point, modeling would be
completed for the limits the I\avajo Nation would propose putting in place to meet flow
recommendations. No modifications of operating rules are proposed until the method of meeting
the depletion guarantee is fmalized and the model runs are completed to determine the needed
operating criteria. The Navajo Nation would then implement the limitations necessary to keep
basin depletions under the baseline depletion unless future consultations, a change in flow
recommendations or change in species status remove the requirement for such guarantee.

\"'hen diversions for the NG\VSP begin at the P1\TM weir, it is proposed that the method used to
calculate flow in the critical habitat for Colorado pikeminnow and razorback sucker be modified
by subtracting the ~G\VSP diversion at the P:t\T}..f weir from the gage reading at Farmington
before calculating the average flow in the river. This is consistent with the modeling approach
used and will maintain the minimum flow below the P:N~ weir at pre-project levels or greater.

BIOLOGICAL ASSESSr..1ENT
NAVAJO GALLUP WATER SUPPLY PROJECT
September 3. 2004

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