Stormwater Capture Master Plan PDFs/12_LADPW_SWMP_2017TechConf_RVi… · LA’s Sustainable City...

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

rafael.villegas@ladwp.com