HomeMy WebLinkAboutStaff Report 14974
City of Palo Alto (ID # 14974)
Utilities Advisory Commission Staff Report
Meeting Date: 2/1/2023 Report Type: VII. NEW BUSINESS
City of Palo Alto Page 1
Title: Discussion and Status Update on the One Water Plan
From: Director of Utilities
Lead Department: Utilities
This item is for discussion and no action is requested.
Staff seeks input from the Utilities Advisory Commission (UAC) on progress to date developing
the One Water Plan for Palo Alto. Staff will use this input to guide the development of its water
supply and conservation options and the process of screening and packaging those options into
potential water supply portfolios.
The attached presentation (Attachment A) provides an overview of the One Water Plan, water
supply and conservation options, screening process, draft evaluation criteria and community
survey results, and water supply portfolio themes. Attachment B provides a detailed list of
water supply and conservation options.
Staff plans to return to the UAC during a joint meeting with the Stormwater Management
Oversight Committee to present initial results in the second quarter of 2023.
Attachments:
• Attachment A: Presentation
• Attachment B: Supply Options
• CITY OF
PALO
ALTO
February 1, 2023 www.cityofpaloalto.org
One Water Plan Update
Utilities Advisory Commission
Staff: Lisa Bilir •
CITY OF
PALO ALTO
2 www.cityofpaloalto.org
Outline
•One Water Plan Overview
•Discussion: One Water Plan Strategic Direction
•Supply & Conservation Options and Screening Process and UAC Ideas for
Additional Options
•Evaluation Criteria and Engagement Meetings Results
•Discussion: Portfolio Themes
•Next Steps
•
CITY OF
PALO ALTO
3 www.cityofpaloalto.org
One Water Plan: Roadmap in an Uncertain
Future
The One Water Plan:
•Is a Key Action in Sustainability and Climate Action Plan
•Is a long-term 20-year (through 2045) Water Supply Plan
•Addresses future uncertainty such as SFPUC supply reliability,
droughts,and climate change
•Includes robust and meaningful stakeholder engagement
•Is being completed by an outside consultant Carollo Engineers, a
National One Water Thought Leader
•Builds on existing plans/work
What the One Water Plan does not directly address:
•Current ongoing drought
•Short-term emergencies such as earthquakes and wildfires –
addressed under separate emergency plans
•
CITY OF
PALO ALTO
TITLE 40 FONT BOLD
Subtitle 32 font
4 www.cityofpaloalto.org
One Water Plan Project Overview
Data
Gathering
Water Supply &
Conservation
Options
Community Needs
and Priorities
{Sept 2022)
Assessment
of unknowns
Sharing Initial
Results
{-Feb 2023)
Supply &
Conservation
Portfolios
FW1dlng
strategy
•
CITY OF
PALO ALTO
Recommended
Supply Strategy
Trigger-based
Implementation
Strategy
Supply
Options
Screening
Evaluation
Criteria
Exploring Water
Supply Options
(Dec 2022)
TITLE 40 FONT BOLD
Subtitle 32 font
5 www.cityofpaloalto.org
Water Conservation Regional Comparison •
CITY OF
PALO ALTO
Average Residential Water Use in BAWSCA Region in FY 2012/ 13
was 71 GPCD
BAWSCA Member Agency SFPUC Purchase
and Residential Capita Per Day Use in FY 2012/2013
O Brisbene/GMIO
r-fWS.SSF
U O Hsywarcf We5lboroogh O O •
o =n Bn.100
Q Millbfae
North Coa•I O .Bu~ingam&
H,llsoorougt,. A .E51ero
., .ACWD
CWS-Mi<lfen Mid Pen • d edwOOdQ\)'
.~nloParl<
CoaslsldeQ 0 easl Palo AIIO
SFPUC Purchases
0 1 mgd
Q 2 .5mgd
0 5mgd
0 10mgd
Residential Per Capita Use
e > 75GPCD
65-75 GPCD
48-65 GPCD
e <48GPCD
• NA
-
Palo Alto Q Mdpllas San Josi!
SianfotdQ Mountain View 0
CWS-Bear Gulc11-0 • •sani;,Cfara •Purlss,ma Hills
Sunnyvare
Soon:e; 8AWSCA-FY 2012/2013 Annual Survey
0 2 _5 5
I I I
10 MIies
I I A
24133
Sources : BAWSCA FY 2020/2 1 Annua l Survey and SFPUC 2020 UWM P
• No agencies us i ng < 48 GPCD
• 9 agencies us ing 48-65 GPCD
• 12 agencies us ing > 75 GPCD
• 49 GPCD SF Reta i l Res idential
Use (avg.)
Bay A:reA Water Suppi:v & CaNIMVatlon Aga-n.ey
TITLE 40 FONT BOLD
Subtitle 32 font
6 www.cityofpaloalto.org
Water Conservation Regional Comparison •
CITY OF
PALO ALTO
Average Residential Water Use in BAWSCA Region in FY 2020/21
was 66 GPCD
BAWSCA Member Agency Sf PUC Purchase
and Residential Capita Per Day Use in FY 2020/2021
Daly City
• O Br-..b;mo/GMI0
•CWS-SSF O Hayward
Westbofough •
•S•nBruno
Q Mllbrae
North Coast O Burlrigame
0
Hillsborough . 0 O Estero
CWS-MidP n Mid Pen
O O Redwooc! City
Q MenloPatk
Coastslde Q .East PatoAllo
O ACWD
SFPUC Purchases
O 1 mgd
Q 2.5mgd
0 5 mgd
0 10 mg<I
Res idential Per Capita Use
• > 75 GPCD
65-7 5 GPCD
48-65GPCD
• <48 GPCD
• NA
CWS-Bear GUich--
Polo Alto Milpitas
san Jose
Stanford O Mountain View • Q
Source ; BAWSCA-FY 20201202 1 Aonual Survey
25/33
Q o O santa Clore
•Pu,lsslma Hits
Sunnyvat~
Sou rce s: BAWSCA FY 2020/21 An nua l Su rvey and SFPUC 2020 UWM P
N
0 2.5 5
I I I
10 Mi les A
• 9 agencies us i ng< 48 GPCD
• 8 agencies us i ng 48 -65 GPCD
• 4 agencies us i ng > 75 GPCD
• 42 GPCD SF Retail Residential
Use (avg .)
TITLE 40 FONT BOLD
Subtitle 32 font
7 www.cityofpaloalto.org
Discussion: Recommended One Water
Strategic Direction
1.Prioritize actions that reduce Palo Alto's Water Demand without compromising tree
canopy health
2.Develop sustainable, resilient water supply portfolios to meet the remaining
demand
•
CITY OF
PALO ALTO
8 www.cityofpaloalto.org
Supply and Conservation Option Screening •
CITY OF
PALO ALTO
Potential Water Supply
and Conservation Options
Themed
Project Portfolios
Recommended
Implementation
Strategy
□ ■ ■ -□□ ••• ■
■ ■ □• □ •• □□ ••• ■
■ □•
~25 options
■ Ongoing/Already
Planned
■ Not feasible ~Obht
time
■ Moving forward
■ ■ D o □■ ■ ••• ■
■ □•
~15 options
Project
Screening
Criteria
■ Estimated Yield (afy)
■ Life Cycle Costs ($/acre-ft)
■ Increases supply reliability
in drought years?
■ Other?
A B C D "C"
4 portfolios 1 supply portfolio
■ Supply Availability
■ Supply Resilience
■ Community Benefits
■ Environmental Benefits
■ Life Cycle Cost
■ Ease of Implementation
9 www.cityofpaloalto.org
Supply Option Pre-Screening
Ongoing or
already
planned
Not feasible
at.this .time
■ Planned/ongoing conservation
■ Advanced metering program
■ Distribution system water loss reduction
■ Non-potable reuse
■ SFPUC imported water supply
Deemed Infeasible in Previous Studies
• Temporary dewatering sites
• lnteragency transfer agreement
■ Excessive Cost or Complexity
• Blackwater capture and reuse
• Atmospheric water generators
• Local surface water reservoir
• Valley Water treated water (via new pipeline)
Outside of City Control
• Indirect potable reuse at Lake Lagunita
(groundwater recharge)
• Regional storage
•
CITY OF
PALO ALTO
10 www.cityofpaloalto.org
Supply Option Pre-Screening
■ New conservation actions
■ Converting emergency supply wells
■ City park groundwater irrigation
■ Direct potable reuse (via regional facility or City facility)
■ Indirect potable reuse via groundwater injection
■ Expanded non-potable reuse
■ Permanent dewatering (as part of reuse options)
■ Graywater capture and reuse
■ Stormwater capture (residential/commercial-scale or GSI)
■ Multi-source below-ground storage (e stormwater detention)
■ Desalination
■ Other ideas from today: _________ _
•
CITY OF
PALO ALTO
. :twi!ERE?
HUW ! WHO? ---' WHAT? HOW? WHY?
~HOW?.¥ ---
11 www.cityofpaloalto.org
Evaluation Criteria
Supply Availability
• Norm a l year re liab il ity
• Dry year re li ab il ity
enefits
• Wa t er qual ity
• Wa t er equity
• Vu lnerabi lli ty risk score
(res iilience to
uncertai nt ies)
Environmental Benefits
• Tree canopy health
• Sustainab le water
supp li es
• Waters h ed hea lth
•
CITY OF
PALO ALTO
Life Cycle Cost
• $/acre-foot cost of each
portfolio
• Implementatio n t ime li ne
• Ope rationa l co m plexi t y
• Alignment wi t h ot he r
effo rt s
• Publ ic acce pt ance
• Regu latory comp lex iity
• Fund i ng oppo rt un it ies
12 www.cityofpaloalto.org
Evaluation Criteria Survey –Community
Results
•
CITY OF
PALO ALTO
Scale these crit,eria on relative importance. il\llentimeter
Supply Availability
Supply Resilience
Life Cyc le Cost
Community Benefits
Environmenta Benefi ts -----------_-_,6.6
Ease of Implementation
7.3
~wJ!ERE?..,
HUW!WffO?
WI? 111111m,,11n 10M?
, WHAT? HOW? WHY?
~HOW?~ ---
13 www.cityofpaloalto.org
Discussion: Proposed Portfolio Themes
Required
Baseline
Portfolio
Business as
usual, only
implementing
already
planned
projects and
programs .
Baseline for
Portfolio
comparison
I
Minimize
Cost
What mix of
options will
have the
lowest
combined
supply cost?
Maximize
Local
Supplies
What mix of
options
further
increase the
City's local
water
supplies the
most?
Requesting your inputl
I
Maximize
Drought
Resilience
What mix of
options
enable the
City to best
mitigate the
impact of
droughts?
•
CITY OF
PALO ALTO
Sustainable
Water
Supplies
What mix of
options are
renewable ,
equitable,
and protect
the
environment
the most?
♦
Other
Themes
14 www.cityofpaloalto.org
Next Steps
1.Stakeholder Engagement –Initial Results
2.UAC Initial Results/ Stormwater Oversight Committee Joint Meeting
3.City Council Initial Results –Information Only
4.UAC Final One Water Plan
5.City Council Final One Water Plan
March 2023
Q2 2023
Q2 2023
Fall 2023
Fall 2023
•
CITY OF
PALO ALTO
Palo Alto One Water Supply Plan
Draft - Supply Options Matrix
November 2022
Category #Supply Option Description
1 Planned/Ongoing Conservation
Continuation of ongoing water conservation programs that
will continue to meet state efficiency legislation. Includes
customer rebate programs for implementing efficiency
measures.
Includes continuing to implement AMI (advanced metering
infrastructure) for water meters to detect and reduce water
leaks. Program is ongoing and expected to be complete in
2024-2025.
2 Enhanced conservation
Conservation efforts that go above and beyond current
conservation measures. Could include more aggressive
building codes and/or alternatives for serving the needs of
Foothills Nature Preserve, including irrigation and filling of
Boronda Lake.
Includes customer side water loss reduction. Outdoor
conservation mechanisms could include incentives for
transitioning to native, drought tolerant trees; banning or
reducing lawns, while maintaining tree canopy.
3 Converting emergency supply wells Converting the 8 wells constructed/rehabbed in 2015 from
emergency to potable use.
4 City park groundwater irrigation Construct new small wells to irrigate city parks.
Conservation
Groundwater
DRA
F
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Palo Alto One Water Supply Plan
Draft - Supply Options Matrix
November 2022
Category #Supply Option Description
5 Expanded NPR
NPR Phase 3 pipeline extended into the foothills and Los
Altos Hills (Northwest County Recycled Water Strategic Plan,
Option A2)
6 Direct potable reuse (City facility)
AWPF constructed near the RWQCP to provide a local DPR
source. (Northwest County Recycled Water Strategic Plan,
Option D1)
7 Direct potable reuse (regional facility)Send water to Valley Water’s regional facility (tertiary treated
wastewater) in exchange for purified water.
8 Indirect potable reuse (groundwater
injection)
AWPF constructed near the RWQCP to provide a local IPR
source. AWPF water would be conveyed to five injection well
sites to augment groundwater supply (Northwest County
Recycled Water Strategic Plan, Option C1)
9 Indirect potable reuse (Lake Lagunita
groundwater recharge)
Send IPR treated water to Lake Lagunita on Stanford campus
to percolate into aquifer to augment groundwater supply.
10 Graywater Capture and Reuse
On-site use of graywater (relatively clean wastewater from
baths, sinks, washing machines, other kitchen appliances)
either on a customer-scale or at City facilities.
11 Blackwater Capture and Reuse On-site use of blackwater (wastewater from toilets) either on
a customer-scale or at City facilities.
Water Reuse
DRA
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Palo Alto One Water Supply Plan
Draft - Supply Options Matrix
November 2022
Category #Supply Option Description
12 Residential or commercial-scale
Stormwater/Rainwater Capture
Expand upon current City rain barrel program. Potentially
work with larger sites such as schools to implement larger
scale rainwater capture.
13 Green stormwater infrastructure
Increased implementation of green stormwater infrastructure,
including bioretention areas, pervious pavement, green roofs,
etc. Could include large scale stormwater capture at parks for
reuse.
14 SFPUC supply
Water purchased from San Francisco's Regional Water
System. 85% of this water comes from Hetch Hetchy and
15% from local watersheds in Alameda and San Mateo
Counties.
15 Valley Water treated water
Extend Valley Water treated water pipeline to connect to
SFPUC pipelines and serve Palo Alto at the Page Mill
turnout. Water source undefined.
16 Interagency Transfer Agreement This would include purchasing additional water from another
water agency.
17 Atmospheric water generators (AWGs)
Extract water by condensing humidity from ambient air. This
alternative would consider both home and commercial-scale
AWGs.
18 Local storage This would include building surface storage within the City's
boundaries and/or a local watershed.
19 Regional storage This would include partnering with other agencies in the
region to build or expand surface storage (i.e. Los Vaqueros)
Stormwater Capture
and Use
Imported Water
Other
DRA
F
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Palo Alto One Water Supply Plan
Draft - Supply Options Matrix
November 2022
Category #Supply Option Description
20 Multi-source storage
Storage to store stormwater, recycled water, or dewatering
water (from permanent sites) dependent on time of year and
water source availability. Would be limited to City-owned
facilities.
21 Regional desalination Regional or local desalination project utilizing either brackish
groundwater or bay intake.
22 Temporary dewatering sites Trucking water from temporary dewatering sites (such as
basement construction) to City parks for irrigation.
23 Permanent dewatering sites
Redirect discharge from permanent dewatering sites (Oregon
Expressway and City Hall) to RWQCP to increase flows for
future potable reuse project.
Other
(cont.)
DRA
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