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 3.1 SJRIP Flow Recommendations

Duration

>10,000

Threshold Discharge - cfs
>8.000 >5,000

>2 500

-~~- '.~~~-"~

A veraae Freauencv
1 days 30.0% 40.0% 65.0%
5 days 20.0% 35.0% 60,0%
10 days 10.0% 33.0% 58,0%
15 days 5.0% 30.0% 55.0%
20 days 20.0%
21 days 50.0%
30 days 10.0% 40.0% 60.0%
40 days 30.0% 50.0%
5Oda~ 20.0% 45.~
60 days 15.0% 40.0%
Flow Criteria 8. Min Duration Max. Years wiD meetina criteria
>9.700 cfs for 5-days 10
:>7.760 cfs for 10-days 6
>4,850 cfs for 21-days 4
>2,450 ds for 10-davs 2
Base Flow> 500 cfs weekly average below Farmington, using the lesser of the
average of the Farmington, Shiprock and Four Corners or the Shiprock, Four
Corners and Bluff Gages.

90.0%
82,0%
80,0%
70.0%
65.0%

SJRIP flow recommendations. Table 3.2 summarizes baseline depletions in the basin. Table 3.2
also shows the approximate current level of depletion in the basin].

The baseline depletion in the San Juan River basin, including the JANNRWSP, totals about
853,000 acre-feet per year. The current depletion in the San Juan River below Navajo dam is
estimated to average about 623,000 acre-feet per year. That leaves an unused depletion of about
230,000 acre-feet per year under current conditions. Table 33 lists the distribution of unused
depiction that is within the environmental baseline among entities and projects. The timing of
these depletions is not known. but it is unlikely that the full environmental baseline depletion
will be reached within the next 30 to 50 years. For example, the justification for the Ute portions
of ALP is based upon population projections in the basin through about 2080. The full NIIP
depletion in the baseline is not scheduled to be in place sooner than 2013 while water delivery to
the entire irrigated area is not scheduled until 2032 and may be delayed further. The
development schedule of the other water in the baseline is not known, but likely will not be at the
levels indicated in the baseline sooner than 20 years.

]'Jlle current MalUS of the non-Indian depletions has nOI oc-en verified by the stales and has 001 been updated since
1995. II is, therefore, approximate. It is used in this analysis only 10 demonslrate the magnitude ofunu~ water.

BIOLOGICAL ASSESSMENT
NAVAJO GALLUP WATER SUPPLY PROJECT
September 3, 2004

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