2012 Hydrograph Develo

Status

March 8, 2011
2011 Process

• Developed flexible constraints und• Tested under 3 hydrologic scenari

• Presented to Western

• Presented to AMWG

• AMWG recommended to Secretar• Adopted by Secretary• Agreed to more inclusive process 
2011 Experiences

• 2011 method has been successful

• Effects will be determined at year 

• Some complications with mainten

unit outages

• Lower releases (than permitted) i

may be desirable to retain sedime

anticipation of a spring HFE
2012 Hydrograph

Development

• Start with 2011 Hydrograph

• Consider operating experiences fr

• Look to improve the combination 

benefit

• 2012 Hydrograph recommendatio

to be within existing environment

compliance

• Non‐MLFF ideas referred to LTEM
0

200400600800

10001200

Oct Nov Dec Jan Feb Mar Apr May 

Monthly Release Volume (KAF)

Month

Round 1

2012 Hydrograph Parameter A

Monthly Volumes Distributions for 9.3 maf 

+/- 100 KAF Range +/- 150 KAF Range +/- 200 KAF Ra
‐400

‐200

0

200400600800

Sand Retention (ktons)

Upper Marble Canyon (RM30)

+/‐ 100 KAF +/‐ 150 KAF +/‐ 200 KAF Unre

Flows in 2011 are all the same for the 4 scenarios

137 ktons or 24 pe

in sand retention 
‐400

‐200

0

200400600800

Sand Retention (ktons)

Lower Marble Canyon (RM61)

+/‐ 100 KAF +/‐ 150 KAF +/‐ 200 KAF Unre
Scenario: +/‐100k acre feet/month

Monthly SLCA/IP Net Purchases 

(MWh) Ave Price ($/MWh) Mon

On-Peak Off-Peak Total On-Peak Off-Peak On-Pe

Oct 12,824 1,365 14,189 40.75 31.75 

Nov 17,599 4,444 22,043 40.75 31.75 

Dec 13,717 2,234 15,951 40.75 31.75 

Jan 4,661 1,002 5,664 42.00 33.75 

Feb ‐53,725 ‐6,970 -60,695 38.50 29.50 -2

Mar ‐49,712 ‐17,488 -67,200 38.60 28.50 -1

Apr 2,188 0 2,188 38.75 23.75 

May 45,885 7 45,892 38.50 23.50 1

Jun 42,906 14 42,920 39.00 24.00 1

Jul 75,939 2,789 78,728 47.00 30.50 3

Aug 54,060 646 54,706 47.00 30.50 2

Sep 37,316 35 37,350 47.00 30.50 1

Tot 203,658 -11,922 191,736 41.55 29.15 9

Example of Power Cost 
Restriction

Level

Additional

Power

Costs

Tons in Marble

Canyon

100 $1,748,000 746,000 

150 $868,000 681,000 200 $245,000 622,000 

None $0 576,000 

Summary of Round 
Sand Retention

0

20406080

100120140160180

$0 $500 $1,000 $1

Sand Retention (ktons)

Power Costs ($1,000’s)
Comparison of

Unrestricted vs. +/‐ 100 

• The +/‐100 kaf scenario retained 1

Marble Canyon

• Historically HFE’s have deposited a

ktons above 8000 cfs level (somew

independent of sediment input)

• Starting with a higher bed load co

expected to help reduce the net lo

sediment from the system by an H

• Additional Cost = $1.75m
530 ktons to beach and eddy

1,410 ktons erod

1,700 ktons >> 290 ktons (Unrestricted Scen

or

1,700 ktons + 170 ktons =1,870 ktons >> 460 ktons (2

Size X HFE River

Sand Budget Illustration 

(Fixed HFE but with Higher Retention)

Assumes: No change in HFE, Historic budget
530 + 50 ktons to beach and

eddy

1,410 + 138 kton

1,870 ktons >> 322 ktons

Sand Budget Illustration 

(Larger HFE Triggered by Retention)

Assumes: 10% Larger HFE Triggered due to Higher Ret

10% more to beach, eddy, and export

River 10% Larger

HFE triggered
Next Steps – Round 

• Add possible November 2011 HFE to 

better simulate starting conditions f

• Scenario 5 – run +/‐ 25 kaf restrictio• Scenario 6 – run +/‐ 50 kaf restrictio• Scenario 7 – run +/‐ 100 kaf restricti• Scenario 8 – run +/‐ unrestricted

• Scenario 9 ‐ run targeted August‐Oc

– (August 800 kaf)

– (Sept/Oct at 5yr Steady Flow Test level
‐400

‐200

0

200400600800

Sand Retention (ktons)

Upper Marble Canyon (RM30)

+/‐ 100 KAF +/‐ 150 KAF +/‐ 200 KAF Unre

Target Ausediment 

for reten
Oct Nov Dec Jan Feb Mar Apr May 

Month

Round 2

2012 Hydrograph Parameter A

Monthly Volumes Distributions for 9.3 maf 

+/- 25 KAF Range +/- 50 KAF Range +/- 100 KAF Range Unrestric
‐400

‐200

0

200400600800

Sediment Budget (ktons)

Upper Marble Canyon (RM30)

Unrestricted 100 50 25 Targette

Fall HFE
Add

Round 2

Power Costs