Steve HirschWater Transfers & Exchanges Program Manager

Metropolitan Water District of Southern California

April 20, 2016

MWD Service Area

MWD Service Area

26 Member Agencies

4 MAF Annual Demand½ Local Supplies½ Imported Supplies

19 Million People

5,200 Square MilesWater Wholesaler

Upper Colorado

River BasinWatershed

Colorado River Aqueduct

CRACRA

SWPSWP

California Aqueduct

Bay-Delta

Lake Oroville

Lake Mead

Lake Powell

Average 10-year Deliveriesmillion acre-feet (MAF)

0.81.2

Factors Affecting Water Transfer NeedsService Area Demands

Availability of member’s local supplies

Availability of CRA and SWP supplies

‐1,500,000

‐1,000,000

‐500,000

0

500,000

1,000,000

1,500,000100%

94%

88%

83%

78%

73%

68%

62%

57%

52%

47%

42%

36%

31%

26%

21%

16%

10% 5% 0%

Acre‐fe

et

Exceedence Probability

Increasing ShortageIncreasing Surplus

Surplus Storage:

• Local Surface Reservoirs

• Groundwater Basins

• Programs Outside Region

Take From:

• Local Storage

• Outside Region Storage

• Transfers

 ‐

 1

 2

 3

 4

 5

 6

Million Acre‐Feet

13x Increase in Capacity

Desert / CoachellaLake Mathews& Lake Skinner

Castaic & Perris

Mojave Demo & Additional Prop. 13

Diamond Valley Lake

Lake Mead Demo

Kern Delta Prop. 13 Programs

Arvin Edison

Additional Lake Mead

Semitropic

Mojave Amendment

 ‐

 100,000

 200,000

 300,000

 400,000

 500,000

 600,000

 700,000

 800,000

Mojave Kern Delta Arvin‐Edison Semitropic

Storage (Acre‐Feet)

LAKESHASTA

LAKEOROVILLE

San Joaquin Valley Transfers

Sacramento Valley Transfers

BAY‐DELTA

Storage Programs:SemitropicArvin‐EdisonKern Delta, Mojave 

CRA

SWP

TypesCrop Idling/Shifting

Groundwater Substitution

Reservoir Reoperation

Lake Shasta

Lake Oroville

Moves through California Aqueduct

Transfer Water Accrues May – Sept(rice irrigation schedule) 

Delivered to Metropolitan

Moves through Delta once capacity is available July – Sept 

(less approximately 20% losses)

Stored in Lake Oroville May ‐ June

Governor’s Drought Water Bank1991, 1992, 1994, 2009

2001 DWR Dry Year Purchase Program

2003 MWD Water Purchase Program

SWC Buyers Group 2005, 2008, 2010, 2015, 2016(?)

Yuba Accord2008‐2025

Regulatory Pumping RestrictionsJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

Delta Smelt

Salmon

Longfin Smelt

Window restricted even during wet years

0

5

10

15

20

25

30

35

Jul Aug Sep

Thou

sand

 Acre‐Feet

Total Capacity Available Under Moderate Delta Restrictions:

45 % SWP Alloc. ~   51 TAF

50 % SWP Alloc. ~   0 TAF

• You Can’t Handle the Truth...

• Valuing Quality over Quantity…

• Rules are Absolutely Necessary…

• I Have an Ap for That…

• I Already Gave at the Office…

• California’s Water Market is Different…