Flood Management in Los Angeles County

October 28, 2015

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Public WorksCore Service Areas

Public Buildings

Water Resources

Waste Management

TransportationDevelopment

ServicesEmergency

Management

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Preparing for El Nino

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Preparing for El Nino

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Preparing for El Nino

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Pre-Storm Coordination Activities

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Available Resources� C.A.R.E.: Coordinated Agency Recovery Effort (dpw.lacounty.gov/care)

� Alert L.A. County

� DPW 24-hour Dispatch: (800) 675 – HELP (4357)

� dpw.lacounty.gov/contact/

� Twitter: @dpwCARE @LAPublicWorks

� Los Angeles County – The Works smart phone app

� https://www.lacounty.gov/elnino

� 911 for Emergencies

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LA Region’s Sources of Water

2/3 Imported

1/3 Local

� Groundwater

� Local Surface

� Reclaimed

Groundwater Recharge

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Dams/Reservoirs1Spreading Grounds2

Natural Bottom Channels3

Rubber Dams4

Morris Dam

Major Dams and Reservoirs

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Hansen Spreading Grounds

Spreading Grounds

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Soft Bottom Channels and Rubber Dams

San Gabriel River

0

100,000

200,000

300,000

400,000

500,000

600,000

700,000

800,000

VO

L C

ON

SE

RV

ED

(A

C-F

T)

WATER YEAR (Oct – Sept)

Stormwater Imported Recycled

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Flood Control District Groundwater Recharge

Avg Yearly

Conservation

310,000 ac-ft**

*Preliminary numbers, to date

**Since 2000. Does not include 25,000 ac-ft/year for seawater barrier operation 14

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Water Conservation and Flood Control Challenges

� The Sediment Management

challenge threatens local water

conservation and storage facilities

� 8 million cubic yards to be removed

from Devil’s Gate, Big Tujunga, and

Pacoima Reservoirs over the next

7 – 10 years

Pickens Debris Basin – 2009-10 Storm Season

La Canada Flintridge, January 2010

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Infrastructure Investments

Big Tujunga Dam

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Los Angeles Basin Stormwater Conservation Study

Objectives

1) Evaluate EXISTING water conservation

under FUTURE conditions

2) Evaluate POTENTIAL NEW facilities &

operational changes for climate change

Population GrowthPopulation GrowthPopulation GrowthPopulation Growth

keykeykeykeyClimate ChangeClimate ChangeClimate ChangeClimate Change

concernsconcernsconcernsconcerns

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Basin Study: Initial Findings

Pro

ject

ed

Wa

ter

Su

pp

ly 2

09

5

0

500,000

1,000,000

1,500,000

2,000,000

2,500,000

8.5

9

9.5

10

10.5

11

11.5

12

2010 2035 2095

Po

pu

lati

on

( M

illi

on

s)

Population Water Demand

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Multi-Benefit Case Study: Sun Valley Watershed Proj ect

� Flood Protection

� Water Quality

� Water Conservation

� Recreation

� Habitat

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Multi-benefit Project: Sun Valley Park

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Multi-benefit Project: Rory M. Shaw Wetlands

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Pilot Study:

Distributed Stormwater Capture System on Residentia l Parcels

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Water Energy Nexus (GHG Reductions):

Imported vs Stormwater

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� Well Prepared for Flood Management

� Investing in Stormwater for Local Sustainability

� Integrated, Collaborative Planning

Summary