ucla grand challenge: sustainable la · ucla grand challenge: sustainable la . water research...
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GOAL: 100% renewable energy, 100% locally sourced water, & enhanced ecosystem health by 2050
UCLA Grand Challenge: Sustainable LA
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Water Research Objectives
� Objective 1: Maximize Local Water Supplies
� Objective 2: Reduce Water Consumption
� Objective 3: Improve Local Water Resource Management
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Water Research Objectives
� Objective 1: Maximize Local Water Supplies ¡ Quantify and characterize existing water supplies ¡ Expand available water supplies ¡ Encourage adoption of local water sources ¡ Enhance water supply resilience and sustainability
� Objective 2: Reduce Water Consumption � Objective 3: Improve Local Water Resource
Management ¡ Improve water management infrastructure and technology ¡ Improve water governance and policy
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Sources of Water for LA City 4
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
2003-04 2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13 2013-14
Wat
er S
uppl
y in
Acr
e Fe
et
Fiscal Year
LADWP Water Supply Portfolio 2003 - 2014
Total Acre Feet
MWD
LA Aqueduct
Local Groundwater
Recycled Water
Data source: https://data.lacity.org/A-Livable-and-Sustainable-City/LADWP-Water-Supply-in-Acre-Feet/qyvz-diiw
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Flux Diagram of the Los Angeles County Water Budget in Thousand Acre Feet (Margulis and Cortes - in progress)
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Approaching a Sustainable Los Angeles 6
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U C L A I O E S / C S M / L A S A N
M A Y 2 8 , 2 0 1 5
7
Approaching Sustainable Water in Los Angeles
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Ballona Creek Watershed - Stormwater 8
� Water Quality Standards ¡ Capturing runoff from sig.
portion of drainage area & putting thru BMPs approaches compliance
� Potential Local Water Supply ¡ Est. recharge in our
scenarios 20,000 to 60,000 afy ÷ Fewer or different BMPs =
less recharge potential ÷ How much becomes water
supply?
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Stormwater Modelling – Ballona Creek Approach 9
� SUSTAIN � Selected BMP types
¡ Regional (infiltration trenches & dry ponds) ¡ Distributed (vegetated swales, bioretention basins, porous pavement)
� Focus on BMP volume required & cost, not on specific locations to install BMPs
� Modelling regulatory / policy impacts ¡ Meeting water quality-based effluent limits ¡ Capturing 85th percentile storm (3/4” proxy) across watershed
÷ Urban land cover (85%) => regional BMPs (infiltration trenches) ÷ Urban land cover (85%)=> regional BMPs (dry ponds) ÷ Private land (77%) => distributed LID BMPs ÷ Public land (23%) => distributed LID BMPs
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Ballona Creek Compliance Assessment 10
� No dry weather Cu exceedances for all modeled scenarios except Public Property Runoff to LID
� Similar reduction in Cu wet weather exceedances (10 or 11 down from 105) for BMP optimization, Urban Runoff Infiltrated, and Private Property Runoff to LID
� Best reduction in Cu wet weather exceedances for Urban Runoff Treat and Release (down to 6 wet weather exceedances)
� Highest potential recharge (66,000 AFY) was in Urban Runoff Infiltrated followed by Private Property to LID (55,000 AFY). Lowest was 20,000 AFY.
� Cost range: $500 million to $1.5 billion � Post- modelling: Copper Water Effects Ratios (WERs)
¡ Cu WER >2 sufficient to remove all Cu TMDL exceedances in baseline scenario
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Ballona Creek Watershed- Groundwater 11
� West Coast and Central Basins
� Additional storage space in amended adjudication ¡ WCB: 120,000 acre-feet ¡ CB: 330,000 acre-feet
� Unadjudicated ¡ Santa Monica &
Hollywood gw basins ¡ No Man’s land ¡ Golf courses, others
pumping groundwater for irrigation
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Ballona Creek Watershed - Recycled Water 12
� MFRO – 2013-2014 flow: 279 MGD, 97% constituents end up in brine, 71% recovery (89% MF, 80% RO) => max production of recycled water @ HTP is 198 MGD.
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Dominguez Channel & Machado Lake Watersheds 13
� WQS Compliance analysis for DC & ML
� Brackish plume in WCB ~600,000 AF as opportunity
� Terminal Island WRP has plentiful local NPR demand
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IWM Flow Feedbacks (LA River) 14
Centralized treatment
plants
Non-Potable demands Groundwater recharge
Indoor Conservation
Current customers’ wastewater
On-site graywater systems
Upstream treatment plants for
local demand
Upstream / satellite plants return more concentrated effluent (can also be large customers putting in own water treatment plants)
Increased diversion of runoff to sewers
Sewer System
Storm Drain System LA River &
tributaries
Beneficial uses / flows Water quality reqts More?
outdoor conservation; more BMPs (distributed & regional)
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Los Angeles River Watershed 15
� Integrated � Beneficial use conflicts / Minimum flow requirements � In-Channel BMPs � Water supply benefits for infiltrated stormwater and
recycled water � Costs and Benefits
¡ Capital ¡ O&M ¡ Life cycle ¡ Ancillary – flood control, open space, recreation, property values,
social � Energy use / GHG emissions
¡ Life cycle
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