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Metadata for 2011 Court Order Spill Web-page:
In accordance with the Court Order and 2011
Spring Fish Operations Plan (FOP), voluntary spill was initiated at the Snake River
Projects at 0001 hours on April 3, 2011. Summer spill volumes were initiated at 0001 hours
on June 21, 2011, per the 2011 Summer FOP. The 2011 Spring and Summer Fish Operations Plans call for the
following spill levels at the Federal Snake River Projects.
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Project
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Spring Spill (April 3
- June 20)
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Summer Spill (June 21
- August 31) –
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Day / Night Spill
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Day / Night Spill
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Lower Granite
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20 Kcfs / 20 Kcfs
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18 Kcfs / 18 Kcfs
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Little Goose
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30% / 30%
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30% / 30%
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Lower Monumental**
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Gas Cap / Gas Cap
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17 Kcfs / 17 Kcfs
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Ice Harbor
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30% / 30% vs 45 Kcfs /
Gas Cap
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30% / 30% vs. 45 Kcfs /
Gas Cap
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In accordance with the Court Order and 2011
Spring FOP, voluntary spill was initiated at the Lower
Columbia projects at 0001 hours on April 10, 2011. Summer spill
levels were initiated on the dates specified below for each project, per the 2011 Summer FOP. The 2011
Spring and Summer Fish Operations Plans calls for the following spill levels at the Federal Lower Columbia
River Projects.
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Project
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Spring Spill (April
10- June 30)
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Summer Spill (Through August 31, start dates below) –
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Day / Night Spill
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Day / Night Spill
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McNary
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40% / 40%
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50% / 50%
(beginning June 20, 2011)
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John
Day
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30% / 30% and
40% / 40%
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30% / 30% and 40% / 40%
(beginning July 1, 2011)
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The Dalles
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40% / 40%
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40% / 40%
(beginning July 1, 2011)
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Bonneville
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100 Kcfs / 100 Kcfs
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85 Kcfs/121 Kcfs vs. 95 Kcfs/95 Kcfs (June 16 - July 20) and
75 Kcfs/Gas Cap (July 21 - August 31)
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Court Order Spill:
All projects have a minimum powerhouse
flow requirement. The table below provides the range of minimum powerhouse
requirements for each project, followed by the assumed minimum for the graphs
(in parentheses). The assumed
minimum requirements include project specific miscellaneous flows (e.g.,
adult fishways).
|
Project
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Minimum Powerhouse
Flow (kcfs)
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Lower Granite
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11.3-13.1 (12)
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Little Goose
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11.3-13.1 (12)
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Lower Monumental
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11.3-13.1 (12)
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Ice Harbor
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8.5-10.3 (10.5 Mar-Jul)
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McNary
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50-60 (55)
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John
Day
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50-60 (51.2)
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The Dalles
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50-60 (56)
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Bonneville
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30-40 (42)
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At low flows the Court Ordered spill
amounts cannot always be provided along with minimum powerhouse flows (PH Min).
In this instance all estimates of Court Order Spill (i.e., red line on
graphs) are adjusted for assumed project specific powerhouse minimum
requirements using the following criteria:
If Total Flow > Court Order + PH Min
' Court Order = Court Order
If Total Flow < Court Order + PH Min ' Court Order = Total Flow - PH
Min.
12-hr Avg TDG:
The 12-hr average TDG levels that are
presented in the graphs above are according to the Oregon method of calculation. This method
of calculation estimates the 12-hr average TDG based on the 12 highest hourly
TDG readings in a 24 hour period. These 12 highest hours are not necessarily
consecutive.
**Spill to the Gas Cap:
In the Court Order, spill to the gas cap
means to spill a volume of water that achieves the total dissolved gas (TDG)
waivers, specifically, the 120% tailrace TDG criteria, and the downstream
forebay 115% TDG criteria. To assess whether the Court Order is being
implemented, spill should be evaluated relative to whether the 120% TDG is
being met in the tailrace, and/or the 115% is being achieved at the next
downstream forebay. Both TDG levels are plotted on the graph for each
project.
The US Army Corps of Engineers (COE)
develops daily levels of maximum spill that the COE estimates will not exceed
the TDG criteria. These estimated "spill caps" are given to the
project operators as maximum spill levels. The estimated "spill
caps" presented in the graphs are taken directly from the TMT website (http://www.nwd-wc.usace.army.mil/tmt/documents/ops/spill/caps/).
However, updates of the estimated
“spill caps” are not always available and, thus, the FPC graphs may
lag several days. The COE's assessment of meeting the Court Order is
dependent on whether a project spills to the estimated "spill
caps".
IHR:
Spring and summer spill at IHR will alternate between two different levels of Court
Order Spill (30%/30% versus 45 kcfs/Gas Cap). Prior to April 28th, spill
at IHR will be 45 Kcfs/Gas Cap.
From April 28th to July 13th, the two spill
levels will be alternated in 2 day blocks. After July 13th, spill at IHR will be 45 Kcfs/Gas Cap
JDA:
JDA will be evaluating two levels of spill in spring and summer 2011,
beginning around April 27th (30%/30% and 40%/40%). Prior to the start of the testing,
spill at JDA will be 30%/30%. After the test is concluded on
July 20th, spill at JDA will be 30%/30%.
Note: Spill at some projects varies relative to flow, therefore the scale
of Y-axes may be different for each project and may change from week to week
at an individual project.
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