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INCREASING RELIABILITY AND RESILIENCY: STORMWATER
June 23, 2015
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LA Region’s Sources of Water
60% Imported
40% Local
Groundwater
Local Surface
Reclaimed
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Local Storage: Groundwater Basins
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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 Growth
key Climate Changeconcerns
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Basin Study: Initial Findings
Pro
ject
edW
ater
Sup
ply
20
95
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
illio
ns)
Population Water Demand
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210,000AFY of stormwater is recharged
14 26spreadinggrounds
On average 480miles ofchannels
andandby a system of
dams
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
800,000
226,163
745,468
409,536
177,327
217,673 185,709
390,903
609,741
213,161
156,777 138,189
74,910*
VO
LC
ON
SER
VED
(AC
-FT)
WATER YEAR (Oct – Sept)
Stormwater Imported Recycled
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Flood Control District Groundwater Recharge
Avg YearlyConservation
315,500 ac-ft**
*Preliminary numbers, to date**Does not include 25,000 ac-ft/year for seawater barrier operation 8
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
Seawater Barriers
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Completed Projects
22 Projectscompleted since2007 to improvestormwater capture
Increased spreadinggrounds capacity by
2190 AF
Increased AverageAnnual WaterConserved by
19,770 AFHansen Spreading Grounds
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Reservoir Sediment Removal Projects - Planned
Pacoima Reservoir
Restores 2,000 AF of
reservoir storage capacity
Big Tujunga Reservoir
Restores 1,500 AF of
reservoir storage capacity
Cogswell Reservoir
Restores 1,500 AF of
reservoir storage capacity
Devils Gate Reservoir
Restores 1,500 AF of
reservoir storage capacity
Pacoima Dam
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Spreading Grounds Improvements - Planned
Santa Fe Spreading Grounds
11 projects 33,740 AF/year
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Multi-benefit Projects: Sun Valley Watershed Project
Flood Protection
Water Quality
Water Conservation
Recreation
Habitat
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Multi-benefit Projects: Sun Valley Park
30 AFY
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Multi-benefit Projects: Rory Shaw Wetlands
590 AFY
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Integrated Regional Water Management Groups
Greater Los AngelesIntegrated RegionalWater Management Plan(IRWMP)
Gateway IRWMP
Antelope Valley IRWMP
Santa Clara River IRWMP
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IRWM Grant Funding to Date
Group # of Projects Grant Award
Greater LA 52 $101,047,295
Gateway 3 $3,941,966
Antelope Valley 1 $1,666,244
Santa Clara River 14 $30,681,520
TOTAL 70 $137,337,025
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Collaborative WatershedPlanning Under the2012 MS4 Permit
Address water quality concerns,including 33 TMDLs
Increase stormwater reuse
Augment water supply
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Example: During ConstructionAfter
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Roosevelt Park
Water Supply
Can recharge up to 127 AFY Supply 255 households
Water Quality 190.5 acre drainage area
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Numerous Drought Response Projects
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Investing in Stormwater for Local Sustainability
Integrated, Collaborative Planning
Summary