Transcript Moffatt & Nichol / CDM Strategy Session

Recycled Water Program for
the City of Los Angeles
1
Stresses on the City’s Water Supply
► Continuing low snowpack in Eastern Sierra
► Statewide water storage is well below normal
► MWD water storage less than ½ of 2007 levels
► Court ruling limits water exports from Bay-Delta
► Environmental enhancement in Owens Valley
► Groundwater contamination in San Fernando Basin
► Uncertain climate change impacts
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Los Angeles Water Supplies
Average Year
Local
Groundwater
11%
MWD
53%
Recycled
Water
1%
Los Angeles
Aqueduct
35%
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Water Supply Action Plan
• Released May 2008
• All new demand for water will be met through a
combination of water conservation and water
recycling
• Plan calls for development of 100,000 acre-feet by
2030
4
Water Supply Action Plan Strategies
► Maximize water recycling
► Increase water conservation
► Enhance stormwater capture
► Accelerate groundwater cleanup
► Expand groundwater storage
► Green Building initiatives
5
Los Angeles Water
Recycling Improves
Water Supply
50% of new supply to be met by
water recycling by 2019.
• 19,350 AFY by 2014
• 50,000 AFY by 2019
• 100,000+ AFY by 2030
Irrigation and Industrial
Groundwater
replenishment
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Maximizing Water Recycling
GOAL: 50,000 acre-feet per year by 2019
► Joint collaboration with the Bureau of Sanitation
►Groundwater replenishment with advanced treated
wastewater
• Requires upgrading Tillman Plant to advanced treatment
• Planned supply of 15,000 AFY by 2019
►Expand recycled water distribution for irrigation and
industrial use
• Requires building miles of new ‘purple pipes’
• 35,000 AFY by 2019
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Actions to Maximize Water Recycling
•
Inform and engage stakeholders
•
Develop a Recycled Water Master Plan
•
Increase recycled water for irrigation/industrial uses
•
Purify recycled water for Groundwater Replenishment
•
Construct advanced treatment facilities
•
Pursue all possible funding sources
•
Work with regulatory agencies for permit approvals
•
Pursue options to maximize recycling beyond 50,000 AFY
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About the Recycled Water Master Plan
ACTIVITIES TO INCREASE RECYCLED WATER TO 50,000 AFY
► Expand Distribution System - 15,650 AFY by 2019. For Irrigation
& Industrial Usage
– Identify customers with approved uses for recycled water
– Expand purple pipe distribution system (pipes, tanks, pump stations)
– Layout distribution system in practical and cost effective manner
► Groundwater Replenishment – 15,000 AFY by 2019
– Evaluate Advanced Treatment Technologies for GWR
– Pilot Testing of Advanced Treatment at Tillman (3-year pilot)
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About the Recycled Water Master Plan
ACTIVITIES TO MAXIMIZE USE BEYOND 50,000 AFY
► Review of Satellite recycled water facility opportunities
► Evaluate Tertiary and Advanced Treatment at Hyperion
► Evaluate upgrades at Tillman and LA/Glendale Plants
and improvements to sewers tributary to all the Plants
► Increase recycled water system reliability
► Evaluate inter-agency/City partnership opportunities to
support additional GWR and recycled water activities
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About Groundwater Replenishment (GWR)
► Advanced treated recycled water to be sent to
spreading basins to percolate underground
► Becomes part of groundwater supply
► Successfully implemented in US & Worldwide:
 Orange County, California
 Carson, California
 Scottsdale, Arizona
 Fairfax, Virginia
 Australia
 Singapore
 El Paso, Texas
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About Groundwater Replenishment (GWR)
► GWR for L.A. will use recycled water from Tillman
► Plant currently treats wastewater to safely reuse for
irrigation and industrial uses
► Plant will be upgraded with multiple advanced treatment
steps (microfiltration, reverse osmosis, and other
purification steps)
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About Groundwater Replenishment (GWR)
► Highly purified water will be transported through existing
pipes to spreading grounds near Hansen Dam
► Will be absorbed into ground along with rainwater
► Mixed supply of purified water and rainwater will migrate
underground to potable supply wells over time
► Water pumped from wells will mix with other supplies and
be sent to DWP customers
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Key Features of Los Angeles River Environment
Sepulveda Basin
• Lake Balboa
• Wildlife Lake
• Japanese Gardens
Glendale Narrows
• soft bottom
• groundwater inflow
• wetland & riparian habitat
LA River
Revitalization
Opportunities
Lower Reach
Photo Sources:
-LA River Revitalization Plan (2007)
-LA River Recycled Water Flow Optimization Study – Phase 2 (2004)
• shorebird habitat
• algal growth
• estuary
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Low Flow Contributions to Los Angeles River
WRP = 41mgd (98%)
Runoff = 1 mgd (2%)
GW = 0 mgd (0%)
Lakes @ DCT
Glendale Narrows
Lower Reach
*Flows based on 10th-percentile
(2004 LA River RW Evaluation) (source years 1989-2000)
WRP = 54mgd (87%)
Runoff = 5 mgd (8%)
GW = 3 mgd (5%)
WRP = 54 mgd (64%)
Runoff = 27 mgd (32%)
GW = 3 mgd (4%)
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Lakes at Tillman Water Reclamation Plant
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Recycled Water Use Considerations for City of
Los Angeles and the Los Angeles River
Water Supply
• Irrigation
• Industrial uses
• Groundwater
replenishment
using advanced
treatment
Environmental
• Lakes at Sepulveda
Basin
• Existing LA River
environments
• Proposed
Revitalization
improvements
Water Quality
• Impacts to TMDL
and other NPDES
requirements
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Los Angeles River Water Wheel - 1863
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Upper Los Angeles River Area Groundwater
► Adjudicated in 1979
► Established court-appointed Watermaster and Administrative
Committee
► Judgment upheld City of Los Angeles Pueblo Water Rights
► Judgment provides Return Flow Credits to Burbank,
Glendale, and Los Angeles
► Los Angeles County Flood Control District manages
stormwater spreading operations
► Local supply for Burbank, Glendale, San Fernando, Crescenta
Valley Water District and Los Angeles
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Upper Los Angeles River Area Groundwater Basins
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San Fernando Basin Well Fields
Tujunga
Rinaldi-Toluca
Lockheed
North Hollywood
Burbank PSD
NHOU Extract. Wells
Erwin
Whitnall
Headworks
Verdugo
Glendale
Pollock
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Thank you
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