Metropolitan’s Storage Management ApproachSouthern California Water DialogueOctober 26, 2011

Metropolitan Storage Serves a Number of Purposes

Dry-Year Storage – regional drought protectionOperational Storage – seasonal regulation of imported suppliesEmergency Storage – helps protect the region from catastrophic events

Original IRP focused on developing new storage New projects/agreements have been developed

Diamond Valley Lake: > 800 TAFConjunctive Use Agreements: > 200 TAFSWP Groundwater Storage: > 1.0 MAFLake Mead Banking: 1.5 MAFDWCV Advance Delivery Account: 800 TAFDWR Contractual Storage: Can be > 400 TAF

Storage Capacity has Increased Dramatically since the 1996 IRP

Metropolitan’s Storage Capacity

0.0

1,000,000.0

2,000,000.0

3,000,000.0

4,000,000.0

5,000,000.0

6,000,000.0

Mill

ion

Acre

-Fee

t

Metropolitan Storage Is Used To Manage Variability In Imported Supplies

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

0.0

200,000.0

400,000.0

600,000.0

800,000.0

1,000,000.0

1,200,000.0

1,400,000.0

1,600,000.0

1,800,000.0

Range : 0.38 to 1.68 MAF

Historical SWP DeliveriesTable A, Article 21, and Carryover

Historical Colorado River Aqueduct Deliveries

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

0.0

200,000.0

400,000.0

600,000.0

800,000.0

1,000,000.0

1,200,000.0

1,400,000.0

Range : 0.54 to 1.26 MAF

1960

1962

1964

1966

1968

1970

1972

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

0

5

10

15

20

25

30

35

Inch

es

Range : 4.6 to 34.0 inches

Historical Local PrecipitationLos Angeles Civic Center 1960-2010

Local StorageDiamond Valley Lake MathewsLake SkinnerConjunctive Use GroundwaterDWR State Project Reservoirs

CRA StorageDWCV Advance Delivery

Lake Mead ICS

Location of Storage Programs Also Matters

Central Valley/SWP StorageSan Luis CarryoverSemitropic Arvin-EdisonKern DeltaMojave

Drought Management Actions

Jan Jan

Jun 2007: Board authorized advertising & outreach campaign funds

2007

Apr 2007: Cut Replenishment Programs

2008 2009 2010 2011

JanJan Jan

Jul 2007:Water Supply Allocation Plan Development Initiated

Jan 2008: Interruption of IAWP by 30%Withdraws from storage programs

Apr 2008:Commencement of Five-Year Supply Plan Actions

Feb 2008: Board approves Water Supply Allocation Plan

Apr 2009: Board approves WSAP Level 2

Apr 2011:WSAP Level 2 removed

Apr 2010: Board approves WSAP Level 2

2006 2007 2008 2009 2010 20110

1

2

3

4

2.2 1.81.1 1.0

1.72.4

Emergency Storage Storage Balance

Mill

ion

Acre

-Fee

tUse of Storage Reduced the Impact of Supply Shortages

Summary of Metropolitan’s Storage Management Approach

Coordinated operation of storage with imported and local supplies provides

Regional drought protectionSeasonal regulation of imported supplies

Emergency storage helps protect the region from catastrophic events

0.0

200.0

400.0

600.0

800.0

1,000.0

1,200.0

1,400.0

1,600.0

1,800.0

2,000.0

Hydrology Year

Mill

ion

Acre

-Fee

t

Range : 0.11 to 1.38 MAF

Forecast of MWD Table-A Supplies2009 DWR Reliability Report

Diamond Valley LakeStorage Levels

Jan-99 Jan-01 Jan-03 Jan-05 Jan-07 Jan-09 Jan-110

100,000200,000300,000400,000500,000600,000700,000800,000900,000

TAF

765 TAF

DVL: 94% of 810 TAF Maximum Storage