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Stormwater Capture Master Plan February 23, 2017
Foundational Action Funding Program Technical Conference Los Angeles, CA
Water Sources and Reliability Challenges
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Los Angeles Aqueduct
Colorado River Aqueduct
Delta
State Water Project
Local Groundwater, Conservation, Recycled Water, Stormwater Capture
Sierra Mountains
State and Local Drought Response
• Mayor’s Executive Directive Order #5 – Reduce GPCD 20% by 2017
• Governor’s Executive Order – 25% Conservation Statewide
• LA’s Sustainable City pLAn – Reduce GPCD 20% (2017), 22.5% (2025),
25% (2035) – 50% Reduction of imported-purchased
water by 2025 – 50% of water locally sourced by 2035
• State Emergency Conservation Regulations – 3 Year Stress Test
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Water Supply Planning Efforts
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2015 Urban Water Management Plan
Water Conservation Potential Study (on-
going)
Recycled Water Master Planning
Documents (2012) Mayor’s ED5 &
Sustainable City pLAn (2015)
Stormwater Capture
Master Plan (2015)
GSIS Remedial Investigation Update Report (2015)
One Water LA 2040
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One Water LA is a collaborative approach to develop an integrated framework for managing the City’s watersheds, water resources, and water facilities in an environmentally, economically and socially beneficial manner.
Manage all water as One Water: Drinking Water Rain / Stormwater Groundwater Recycled Water Wastewater
Sustainable City pLAn & 2015 UWMP Goals
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Cumulative Recharge at Five San Fernando Spreading Facilities
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0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
C
umul
ativ
e R
echa
rge
(AF)
Yea
rly
Rec
harg
e (A
F)
Fiscal Year
Yearly Recharge (AF) Cumulative Recharge (AF)
Centralized vs. Distributed Capture
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Distributed
Dam Improvements
Spreading Basins
Cisterns
Centralized
Green Streets
Dry Wells
Sub-regional
What is the Stormwater Capture Master Plan?
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• Quantifying stormwater capture potential • Identifying new project/programs/policies • Prioritizing based on water supply criteria • Developing costs/benefits for proposed
projects/programs/policies • Defining timing and key milestones • Developing 5, 10, 15, and 20 year goals • Defining partnerships
Stormwater Capture Potential
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29 29 29
35 35 35
35 51
33
63
0
50
100
150
200
Baseline Conservative Aggressive
Aver
age A
nnua
l Cap
ture
Vol
ume
(1,0
00 A
F)
Baseline/Existing
Future Distributed Capture Future Centralized Capture Existing Passive / Distributed Capture Existing Centralized Capture
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114
Distributed and Centralized Capture - 2035
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Stormwater Project Evaluation Process
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• Water Rights • Existing
Infrastructure • Soil
Characteristics • Land Use
Priority Areas
• Determine Flow Path
• Hydrologic Analysis
Quantify Stormwater
Capture Potential
• Cost per acre-foot (AF)
• Year of First Payback
• Internal Rate of Return
Prioritize based on
Water Supply Criteria
• Costs reduced through partnerships
• Costs reduced through grants
Higher Cost
Projects Solutions
• Cost per AF compared to MWD rate
• Consideration of MWD rate increases
Cost Comparison
Cost per Acre-Foot
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DISTRIBUTED INFILTRATION DISTRIBUTED DIRECT USE
13,000
14,000
CENTRALIZED INFILTRATION
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
Centralized Projects Subregional infiltration Green Street Programs On-site Infiltration Subregional direct use On-site direct use
Tot
al L
ifecy
cle
Cos
t per
Cap
ture
($/A
F)
$1,100/AF
$1,550/AF
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Ancillary Benefits of Stormwater Capture
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Increase Water Supply Reliability
Sustain Communities
Enhance Open Space Recreation
Improve Groundwater Quality
Increase Reclaimed Water Usage
Enhance Habitat Improve Water
Quality (TMDLs)
Reduce Greenhouse Gases
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www.ladwp.com/stormwater www.ladwp.com/scmp
Rafael Villegas Watershed Management
