HomeMy WebLinkAboutSUS566ALAStA POWER AUTHORITY
SUSITRA HYDROELECTRIC PROJECT
Federal Eneray Regulatory Coaaiaaioa
Project No. 7114
Technical Memorandum
Framework for Preparation of Comparisons Docum e nts
Prepared for:
HARZA-EBASCO SUSITNA JOINT VENTURE
Entrix, Inc.
October 1985
FRAMEWORK FOR PREPARATION OF COMPARISONS DOCUMENTS
1.0 INTRODUCTION
This techn i ca 1 memorandum presents a framework for conducting the ana 1 yses
leading to an environmental and economic comparisons report and the supporting
Case E-VI impact and mitigation report series. The fr ~mework is depicted
schematically in Figure 1. The purpose of the analyses is to develop a set of
reports to support the selection of a set of env i~onmental constraints through
negotiations between the A 1 aska Power Authority and the resource agencies .
These negotiations are part of the overall settlement process for the Susitna
River Hydroelectric Project.
The Power Authority's goal is to operate the project to maximize power and
energy benefits within environmental and operational constraints.
Environmental contraints include maximum and minimum instream flows (termed
flow requirements) and maximum rates of flow change. Operational constraints
include environmental
reservoir level which
constraints, a minimum reservoir level,
if exceeded results in a prespecified
a maximum
operat in g
procedure, maximum and minimum turbine output, and system electrical energy
demand.
The objective of the comparisons process, as part of the over a 11 sett 1 ement
process, is to compare the aquatic habitat availability for selected
species/life stages resulting from a range of environmental constraints to the
effects of the constraints on the economics of the project. The environmental
benefits and economic costs of prov i ding mitigation through maintenance of
specified downstream flow requirements can be evaluated. This evaluation
provides the basis for negotiations between the Power Authority and the
resource agencies.
The Power Author i ty proposes to use a set of envi ronmenta 1 flow constra i nts
called Case E-VI (Table 1 and Figure 2). These streamflows are referenced to
the USGS streamgage at Gold Creek. All geographical areas that may be impacted
by the construction and operation of the project will be evaluated in the Case
l
Power
Output
!nv 1 roruunta l
Conatrainta
1
o"'erational
Conatrainta
l
Reservoir
Model
Flow
Regimes
Economic Model Middle ' Lower
' I
I Ace•••,
Conatruction
l ' Tranemiaaion
Line Impact•
Impoundment
Zone
Impact a
Lower Riv~r
-
River Habitat va.~--~ " Impacts
Cost of Power
Production
Economic
Sensitivity to
Flow~onstraints
Discharge Model•
Habitat Time
Series and
Duration Analysis
Habitat
sensitivity to
Flow Constraints
I
I
I
I
-~ ( E-VI flows)
I ~~----------~~
I
Middle River
I~pacts
(E-VI flows)
Project
-
Impact ~
Assessment r-
(E-VI flows)
~-E-n~v--i_r_o_nm--:-;~t-a-1~1. r--M-i_t_i_g_a~jt~vi_o_n--,--~
' Economic Monitoring
Figure 1.
Comparisons (E-VI flows)
Flow Regime
Negotiations
Schematic diagram depicting the framework for conducting
the analyses for the comparisons process.
2
Water BecJ1nnifl9
Wee It Clay -·tJI
14 ll Dec:.
15 7 Jan !
16 lit Ja.o.
17 21 Jao.
18 2a Jao.
19 .. , ....
20 u Feb.
21 1a Fetl.
22 25 Feb.
23 .. Mar.
24 u Mar.
25 18 Mar.
26 25 Mar.
27 1 Apr.
28 a Apr.
29 u Apr .
30 22 Apr.
31 29 Apr.
32 ' !tay
33 ll May
34 20 May
35 27 May
36 ) J~
37 10 June
38 17 ~
39 24. Juae
* Hioi•ua •u-er
Gold Creek
Hiniau•
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
. 2,000
2,000
4,000
6 ,000
6,000
6,000
9,000*
9,000*
9,000*
9,000*
Table 1
SUSITNA HYDROELECTRIC PROJECT
FLOW CONSTRAINTS FOR ENVIRONMENTAL
FLOW REQUIREMENT CASE EVI.
Flow ( cfa) Water BecJinning Gold Creek
Maximum Week . I day -tJI Hini•ue
16.000 40 1 J\lly 9,000*
16,000 41 a J\lly 9,000*
16,000 42 u July 9,000*
16,000 43 22 J\lly 9,000*
16,000 44 29 July 9,000*
16,000 45 5 ..... 9,000*
16.000 46 12 Au1. 9,000*
16,000 47 19 ...... 9,000*
16,000 48 26 Aua. 9,000*
16,000 49 2 S.p. 8,000
16,000 50 9 S.p. 7,000
16,000 51 1.6 S.p. 6,000
16.000 52 23 S.p. 6,000
16,000 1 1 Oc:t. 6,000
16,000 2 • Oc:t. 6,000
16,000 3 u Oc:t. 5,000
16,000 4 22 Oc:t. 4,000
16,000 5 29 Oc:t. 3,000
16,000 6 5 Nov. 3,000
16,000 7 u Nov. 3,000
16,000 8 19 Mcrr. 3,0~
16,000 9 26 Nov. 3,000
35,000 10 ) Dec:. 2,000
35,000 11 10 Dec:. 2,000
35,000 12 17 De c:. 2,000
35,000 13 24. Dec:. 2,000
flowa are 9,000 ch ezcept lD dry years wheo the •inimua
will be 8,000 c h. A dry year ia d~fined by the ooe-io-teo year low
flow.
Flow (cfa)
Haxi•u•
35,000
35,000
35,000
35,000
35,000
35,000
35,000
35,000
35,000
35,000
35,000
35,000
35,000
18,000
17,000
16,000
16,000
16,000
16,000
16,000
16,000
16,000
16,000
16,000
16,000
16,000
ae.ooo I
40.000
~
(/J
&L
0 ao.ooo ......,
w
C)
a:
~
~%
0 ......
0 -0
••. o .. :
......_
0
JAN
NOTE
1. DISCHARGE F 0..
SUSITNA RIVER AT
GOLD CREEK
' 2 . PERCENT OF TIME
NATURAL FLOW IS
EQUALLED OR -
EXCEEDED. CURYfS
r-ARE IIASED ON 34
YEARS OF WEEKLY
~ AVERAGED FLOWS
f WITH OCT. 1-7 AS ~J r FIRST WEEK Of 52 i
. .J u WEEKLY INTERVALS
rt-l....r-,.... ~ h '
~
..,
. '
~ ).l -
r--
MAX ..,.;-~ •• ••• ............. _.,.,_
. . . -'"" ~ ~ 11 -~ .,,. ·~ ....:, .·:·-; .. .· .·. ~ . -r L I N DIC A TES MIN F O R
LO W FLOW YEAR •-
-.J l -,Li ~ . --J 1_'-
~ _-::__I
'~
FEB MAR APR MAY JUN JUL AUG SEP OCT
Figure 2 . Case E-VI environmental !low constraints and range
ot natural !lows.
I
I -
~ -'
' ---. . --
NOV DEC
E-VI impact and mitigation report series . The location most affected by
changes in environmental constraints is the Susitna River between Devil Canyon
and Talkeetna {middle Susitna River). A sens~tivity analysis will be conducted
for this river segment by modifying the Case E-VI environmental constraints and
comparing the habitat gained or lost to the increase or decrease in the project
cost. This analysis will be presented in the comparhons report, which will
form the basis for beginning flow negotiations between the Power Authority and
the resource agencies .
This technical memorandum is divided into five sections. Section 2 .0 discusses
the approach for conducting the analyses in the Talkeetna to Devil Canyon
segment of the Susitna River for Case E-VI and other flow constraints. Section
3.0 presents th a Case E-VI impacts and mitigation analyses in other geographic
areas affected by the project. Section 4.0 identifies the reports that will be
available to support the comparisons process. The final section presents the
schedule for information flow among those preparing support documents for the
comparisons process.
2.0 MIDDLE SUSITNA RIVER ANALYSIS
Selection of Environmental Constraints
The environmental constraints are specified as maximum and minimum flows rather
than a specific flow . The selection of flow constraints for the evaluation of
habitat -cost sensitivity involves two basic steps. The first step is to select
a set of environmental constraints which represents the range of flows between
the natural and power flows. The second step is the selection of annual sets
of seasonal values based on specific habitat management objectives {e .g .
optimizing chinook rearing habitat). These values will be de veloped by the
aquatic studies group working on comparisons documents, which includes Entrix,
Harza-Ebasco {HE), Trihey and Associates {T&A), and Arctic Environmental
Information and Data Center {AEIOC).
The Power Authority's preferred flow constraints {Case E-VI) and the mod i fied
flow constraints proposed for the initial habitat-cost sensitivity analyses are
5
presented in Table 2 . In all cases but one , the minimum flow constraint for
the modified case was different from the minimum flow constraint for Case E-VI
during only one season, leaving unchanged the remaining minimum and maximum
constraints. In the one exception {WH 8), the winter maximum const r aints were
changed, leaving unchanged the remaining maximum and minimum constraints. The
selection of these constraints was based on the assumption that an economic and
environmentally sound project wnl have constraints simnar to those of Case
E-VI . The annual set of weekly flow constraints can ~e separated into four
major divisions: winter flows, spring transitional flows, sumer flows, and
fall transitional flows .
In winter {November-Aprn) maximum flow constraints are ,nore important than
minimum, since normal project operation would produce discharges greater than
the minimum flow constraints . The selected winter max-imum is intended to
establish a boundary near the upper range of operational flows that would
result i n flow stability and protect overwintering habitat . Side sloughs are
especially important in this context because chinook juveniles utnize this
habitat for overwintering . The Case E-VI maximum flow of 16,000 cfs would
prevent overtopping of all the major sloughs prior to freeze-up , and stabilize
habitat availability during ice-cover periods. Modified winter maximum flow
constraints of 12,000, 8 ,000 and 4,000 cfs will also be evaluated with and
without ice cover.
The winter minimum flow was established to prevent dewatering incubation
habitat whne avoiding disturbance to the thermal character of overwintering
habitat . The 2,000 cfs Case E-VI minimum represents the high mean natural
winter flow. A modified minimum winter flow constraint of 5,000 cfs will be
evaluated with and without an ice cover to assess benefits to incubating salmon
embryos and overwintering fish.
Flow constr aints during the spring transition period {mid to late Hay) are
intended to maintain flow stability by preventing rapid decreases in discharge
due to decreasing power demand in Hay and require gradual increases in flow to
summer levels. The minimum flow constraints are most important during th i s
period. Beginning in Hay, Case E-VI minimum flow constraints step up from
2,000 tL 4,000 cfs for one week then to 6,000 cfs for 3 weeks, and f i nally
6
Table 2 . Case E-VI and modified flow constraints expressed as Gold Creek f lows
(cfs) for preliminary analyses in the comparisons process .
Water Beginning Mjnimum Constr~ints Maximum
Week Jay Month .E..:.ll_ ~· ll_l* ~· Constraints
14 31 Dec. 2,000 2,000 2,000 2,000 16,000
15 7 Jan. 2,000 2,000 2,000 2,000 16 ,000
16 14 Jan . 2,000 2,000 2,000 2,000 16 ,000
17 21 Jan . 2 ,000 2,000 2,000 2,000 16 ,000
18 28 Jan. 2 ,000 2,000 2,000 2,000 16 ,000
19 4 Feb . 2,000 2,000 2,000 2,000 16,000
20 11 Feb. 2,000 2,000 2 ,000 2,000 16 ,000
21 18 Feb. 2,000 2,000 2,000 2,000 16,000
22 25 Feb. 2,000 2,000 2,000 2,000 16,000
23 4 Mar. 2,000 2,000 2,000 2,000 16,000
24 11 Mar . 2,000 2,000 2,000 2,000 16,000
25 18 Mar. 2,000 2,000 2,000 2,000 16,000
26 25 Mar. 2,000 2,000 2,000 2,000 16,000
27 1 Apr. 2,000 2,000 2,000 2,000 16,000
28 8 Apr. 2,000 2,000 2,000 2,000 16,000
29 15 Apr. 2,000 2,000 2 ,000 2,000 16,000
30 22 Apr. ~.ooo 2,000 2,000 2 ,000 16,000
31 29 Apr. 2,000 2,000 2,000 2,000 16,000
32 6 May 4,000 4,000 4,000 4,000 16,000
33 13 May 6,000 ~ 6 ,000 6,000 16,000
34 20 May 6,000 hQQQ 6,000 6,000 16,0ll0
35 27 May 6,000 ~ 6,000 6,000 16,000
36 3 June 9,000** ~ ~ M.22 35,000
37 10 June 9,000** ~_._QQQ ~ M.22 35,000
38 17 June 9,000** ~ L..QQQ M.22 35 ,000
39 24 June 9,000** ~ L.QQ2 M.22 35,000
40 1 July 9,000** ~ L.QQQ M.22 35,000
41 8 July 9,000** ~ L..Q.Q2 M.22 35 ,000
42 15 July 9,000** ~ L.QQ2 M.22 35,000
43 22 July 9 ,000** ~ L..Q.Q2 M.22 35,000
44 29 July 9,000** L.QQ.Q hQ.Q_Q M.22 35,000
45 5 Aug . 9,000** L.QQ.Q L.QQ2 M.22 35,000
46 12 Aug . 9,000** ~ L..QQQ M.Q.Q 35,000
47 19 Aug. 9 ,000** ~ L.QQ2 M.22 35,000
48 26 Aug . 9,000** ~ L.QQ2 M.22 35,000
49 2 Sep . 8,000 ~ L.QQ2 M.22 35,000
50 9 Sep. 7 ,000 L.QQ.Q 7,000 M.22 35,000
51 16 Sep . 6,000 ~ 6 ,000 6,000 35,000
52 23 Sep. 6,000 ~ 6 ,000 6,000 35,000
1 1 Oct. 6,000 ~ 6,000 6,000 18,000
2 8 Oct . 6,000 LQQQ 6,000 6,000 17,000
3 15 Oct. 5,000 5 ,000 5 ,000 5,000 16,000
4 22 Oct. 4 ,000 4,000 4,000 4,000 16,000
5 29 Oct. 3 ,000 3,000 3,000 3,000 16,000
6 5 Nov . 3,000 3,000 3,000 3,000 16,000
7 12 Nov . 3,000 3,000 3,000 3,000 16 ,000
8 19 Nov. 3,000 3,000 3,000 3,000 16,000
9 26 Nov. 3,000 3,000 3,000 3,000 16,000
10 3 De c. 2,000 2,000 2,000 2,000 16,000
11 10 Dec. 2,000 2,000 2,000 2,000 16,000
12 17 Dec . 2,000 2,000 2,000 2,000 16,000
13 24 Dec. 2 ,000 2,000 2 ,000 2,000 16,000
7
Table 2 cont .
Water Beginning Minimum CQnstraints Maximum
Week Day MQnth UL SL 12* SL 15* SL 23* Constraints
14 31 Dec. 2,000 2,000 2,000 2,000 16 ,000
15 7 Jan. 2,000 2,000 2,000 2,000 16,000
16 14 Jan . 2,000 2,000 2,000 2,000 16 ,000
17 21 Jan . 2,000 2,000 2,000 2,000 16,000
18 28 Jan . 2,000 2,000 2,000 2,000 16 ,000
19 4 Feb. 2,000 2,000 2,000 2,000 16,000
20 11 Feb. 2,000 2,000 2,000 2,000 16,000
21 18 Feb . 2,000 2,000 2,000 2,000 16,000
22 25 Feb. 2,000 2,000 2,000 2,000 16,000
23 4 Mar. 2,000 2,000 2,000 2,000 16,000
24 11 Mar. 2,000 2,000 2,000 2,000 16,000
25 18 Mar. 2,000 2,000 2,000 2,000 16,000
26 25 Mar. 2,000 2,000 2,000 2,000 16,000
27 1 Apr. 2,000 2,000 2,000 2,000 16,000
28 8 Apr. 2,000 2,000 2,000 2,000 16,000
29 15 Apr. 2,000 2,000 2,000 2,000 16,000
30 22 Apr. 2,000 2,000 2,000 2,000 16,000
31 29 Apr . 2,000 2,000 2,000 2,000 16,000
32 6 May 4,000 4,000 4,000 4 ,000 16,000
33 13 May 6,000 6,000 6,000 6 ,000 16,000
34 20 May 6,000 6,000 6 ,000 6 ,000 16,000
35 27 May 6,000 6,000 6,000 6,000 16,000
36 3 June 9,000** lZ.QQQ l~.QQQ ZJ.QQQ 35 ,000
37 10 June 9,000** lZ.QQQ l~.QQQ ZJ.QQQ 35,000
38 17 June 9,000** lZ.QQQ l~.QQQ ZJ.QQQ 35,uOO
39 24 June 9,000** lZ.QOQ 15.QQQ ~J.QQQ 35,000
40 1 July 9,000** lZ.QQQ l~.QQQ ZJ.QQQ 35,000
41 8 July 9,000** lZ.OQQ 15.QQQ ZJ.QQQ 35,000
42 15 July 9,000** lZ.QQO 15.QQQ ZJ.QQQ 35 ,000
43 22 July 9 ,000** lZ.QQQ l~.QQQ ZJ.QQQ 35 ,000
44 29 July 9,000** lZ.QQQ l~.QQQ ZJ.QQQ 35,000
45 5 Aug . 9,000** lZ.QQQ l~.QQQ ZJ.QQQ 35,000
46 12 Aug . 9,000** lZ.QQQ 15.QOQ ZJ.QQQ 35 ,000
47 19 Aug. 9,000** lZ.QOQ l~.QQQ ZQ.QQQ 35 ,000
48 26 Aug . 9,000** lZ.QQQ 15.QQQ lZ I QO_Q 35,000
49 2 Sep. 8,000 lZ.QQQ l~.QQQ 15.QQQ 35 ,000
50 9 Sep. 7,000 lZ.QQQ H.QQQ H.QQQ 35,000
51 16 Sep. 6,000 6,000 6,000 6,000 35,000
52 23 Sep. 6,000 6,000 6,000 6,000 35,000
1 1 Oct. 6,000 6,000 6,000 6,000 18,000
2 8 Oct. 6,000 6,000 6 ,000 6,000 17,000
3 15 Oct. 5,000 5,000 5,000 5,000 16,000
4 22 Oct. 4,000 4,000 4,000 4,000 16,000
5 29 Oct. 3,000 3,000 3,000 3,000 16,000
6 5 Nov. 3,000 3,000 3,000 3,000 16,000
7 12 Nov. 3,000 3,000 3 ,000 3 ,000 16,000
8 19 Nov. 3,000 3 ,000 3 ,000 3,000 16,000
9 26 Nov. 3,000 3,000 3,000 3,000 16,000
10 3 Dec. 2,000 2,000 2,000 2,000 16,000
11 10 Dec . 2,000 2,000 2,000 2,000 16,000
12 17 Dec . 2,000 2,000 2,000 2,000 16,000
13 24 Dec. 2,000 2,000 2,000 2,000 16 ,000
8
Table 2 cont .
Water Beginning Minimum CQnstraints Maximum
Week Day Month .E..:1L SL 9/15* SL 9/23* Constraints
14 31 Dec. 2,000 2,000 2,000 16,000
15 7 Jan. 2,000 2,000 2,000 16,000
16 14 Jan . 2,000 2,000 2,000 16,000
17 21 Jan . 2,000 2 ,000 2.000 16,000
18 28 Jan. 2,000 2,000 2,000 16,000
19 4 Feb . 2,000 2,000 2,000 16,000
20 11 Feb. 2,000 2,000 2,000 16,000
21 18 Feb. 2,000 2,000 2,000 16,000
22 25 Feb. 2,000 2,000 2,000 16,000
23 4 Mar. 2,000 2,000 2,000 16,000
24 11 Mar. 2,000 2,000 2,000 16,000
25 18 Mar. 2,000 2,000 2,000 16,000
26 25 Mar. 2,000 2,000 2,000 16,000
27 1 Apr. 2,000 2,000 2,000 16,000
28 8 Apr. 2,000 2,000 2,000 16,000
29 15 Apr. 2,000 2,000 2,000 16,000
30 22 Apr. 2,000 2,000 2,000 16,000
31 29 Apr . 2,000 2,000 2,000 16,000
32 6 Hay 4,000 4,000 4,000 16,000
33 13 Hay 6,000 6,000 6,000 16,000
34 20 Hay 6,000 6,000 6,000 16,000
35 27 Hay 6,000 6,000 6,000 16,000
36 3 June 9,000** MQ2 MQ2 35,000
37 10 June 9,000** MQ2 MQ2 35,000
38 17 June 9,000** ~ MQ2 35,000
39 24 June 9,000** MQ2 MQ2 35,000
40 1 July 9,000** MQ2 MQ2 35,000
41 8 July 9,000** MQ2 MQ2 35,000
42 15 July 9,000** M.QQ MQ2 35,000
43 22 July 9,000** M.QQ M.QQ 35,000
44 29 July 9,000** MQ2 MQ2 35,000
45 5 Aug. 9,000** 15.000 ZJ.QQQ 35,000
46 12 Aug . 9,000** 15.QQQ ZQ.QQQ 35 ,000
47 19 Aug . 9,000** 15.QQQ ZQ.QQQ 35,000
48 26 Aug . 9,000** 15.QQQ lZ.QQQ 35,000
49 2 Sep. 8,000 15.QQQ 15.QQQ 35,000
50 9 Sep . 7,000 14.QQQ 14.QQQ 35 ,000
51 16 Sep. 6,000 6,000 6,000 35,000
52 23 Sep. 6,000 6,000 6,000 35,000
1 1 Oct. 6,000 6,000 6.100 18,000
2 8 Oct . 6,000 6,000 6,000 17,000
3 15 Oct. 5,000 5,000 5,000 16,000
4 22 Oct . 4,000 4,000 4,000 16,000
5 29 Oct. 3,000 3,000 3,000 16,000
6 5 Nov. 3 ,000 3,000 3,000 16,000
7 12 Nov. 3,000 3,000 3,000 16,000
8 19 Nov . 3,000 3,000 3,000 16,000
9 26 Nov. 3,000 3,000 3,000 16,000
10 3 Dec . 2,000 2,000 2,000 16,000
11 10 Dec. 2,000 2,000 2,000 16,000
12 17 Dec . 2 ,000 2,000 2,000 16,000
13 24 Dec. 2,000 2,000 2,000 16,000
9
Table 2 cont.
Water Beginning Hinimym CQn~traint~ H~~imym CQD~tr~int~
~ D.i:t M2D1h UL ~ ~ E-VI
14 31 Dec . 2,000 LQQQ ~ 16 ,000
15 7 Jan . 2,000 LQ.QQ ~ 16 ,000
16 14 Jan. 2,000 hQQQ ~ 16,000
17 21 Jan. 2,000 hQQQ ~ 16,000
18 28 Jan. 2,000 L.QQQ aJlQQ 16 ,000
19 4 Feb. 2,000 LQ.QQ ~ 16,000
20 11 Feb. 2,000 LQ.QQ ~ 16,000
21 18 Feb. 2,000 LQ.QQ ~ 16,000 n 25 Feb. 2,000 LQ.QQ ~ 16,000
23 4 Mar. 2,000 LQ.QQ a..QQQ 16,000
24 11 Mar . 2,000 LQ.QQ ~ 16 ,000
25 18 Mar . 2 ,000 LQ.QQ ~ 16,000
26 25 Mar . 2,000 L.QM ~ 16,000
27 1 Apr. 2,000 LQ.QQ ~ 16,000
28 8 Apr . 2,000 LQ.QQ ~ 16,000
29 15 Apr . 2,000 LQ.QQ ~ 16,000
30 22 Apr. 2,000 LQ.QQ ~ 16,000
31 29 Apr. 2,000 LQ.QQ ~ 16,000
32 6 May 4,000 LQ.QQ ~ 16,000
33 13 Hay 6,000 6,000 ~ 16,000
34 20 Hay 6,000 6,000 ~ 16,000
35 27 Hay 6,000 6,000 ~ 16,000
36 3 June 9,000*'* MQ2 35,000 35,000
37 10 June 9,000** MQ2 35,000 35,000
38 17 June 9,000** MQ2 35,000 35,000
39 24 June 9,000** MQ2 35 ,000 35,000
40 1 July 9,000** MQ2 35,000 35,000
41 8 July 9,000** MQ2 35,000 35,000
42 15 July 9 ,000** MQ2 35,000 35,000
43 22 July 9,000** MQ2 35,000 35,000
44 29 July 9 ,000** MQ2 35,000 35,000
45 5 Aug. 9 ,000** MQ2 35,000 35,000
46 12 Aug. 9 ,000** ~ 35,000 35,000
47 19 Aug . 9 ,000** ia.QQQ 35,000 35,000
48 26 Aug . 9 ,000** MQ2 35,000 35,000
49 2 Sep. 8,000 8,000 35,000 35,000 so 9 Sep. 1,000 7,000 35,000 35,000
51 16 Sep . 6,000 6,000 35,000 35,000
52 23 Sep. 6,000 6,000 35,000 35,000
1 1 Oct. 6,000 6,000 ~ 18,000
2 8 Oct . 6 ,000 6 ,000 ~ 17,000
3 15 Oct. 5,000 5,000 ~ 16,000
4 22 Oct. 4,000 L.QQQ ~ 16,000
5 29 Oct. 3,000 L.QM ~ 16,000
6 5 Nov . 3,000 LQ.QQ ~ 16 ,000
7 12 Nov . 3 ,000 LQQQ aJlQQ 16,000
8 19 Nov . 3,000 L.QQQ ~ 16,aoo
9 26 Nov. 3,000 hQM ~ 16,000
10 3 Dec. 2,000 LQQQ M.QQ. 16,000
11 10 Dec. 2,000 LQ.QQ ~ 16,000
12 17 Dec . 2,000 LQ.QQ ~ 16,000
13 24 Dec . 2 ,000 LQ.QQ ~ 16,000
10
Table 2 cont .
Footnotes
*Designation of modified constraints
SL x denotes ~ummer low constraint set at x,OOO cfs -only
the Case E-VI summer minimum flow constraints are
modified, while the Case E-VI maximum constraints
remained unchanged
SL x/y denotes ~ummer low constraint set at x,OOO cfs through
the end of July followed by a y,OOO cfs constraint
beginning in early August -only the Case E-VI summer
minimum constraints are modified, while the Case E-VI
maximum constraints remained unchanged.
WL x denotes Winter low constraint set at x,OOO cfs -only
the Case E-VI winter minimum flow constraints are
modified, while the Case E-VI maximum constraints
remained unchanged.
WH x denotes Winter High constraint set at x,OOO cfs -only
the Case E-VI winter maximum flow constraints are
modified, while the Case E-VI minimum constraints
remained unchanged.
**Minimum summer flows are 9,000 cfs except in dry years when the
minimum will be 8,000 cfs. A dry year i s defined by the
one-in-ten year low flow .
11