City of Patterson’s
Urban Water Management Plan
(UWMP)
April 19, 2016
What is an Urban Water Management Plan?
 UWMPs are required by CA Dept. of Water Resources
for larger water providers
 The documents follow DWR guidelines for content
 UWMPs are planning documents that help water
providers evaluate their future water security
 Planning horizon of 2040
 Starting in 2010, UWMPs also required per capita
water use reporting (SB X7-7, 20x2020) to track
water conservation compliance
 The UWMP is a requirement for State funding
Public Notification
 Notice of Intent to Update UWMP
 Letters sent to County and potential Groundwater
Sustainability Agency partners in February
 Follow-up letter sent in March
 Notice of Public Review and Adoption
 Billing notice
 Online notice
 Newspaper notice
Primary Components of 2015 UWMP
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Population and demand analysis
Supply analysis
Per capita water use targets and compliance
Demand Management Measures
Water Shortage Contingency Plan
Additional analysis - Water Loss Audit
Components of 2015 UWMP
Chapter
Appendices
1
Introduction and Overview
A DWR UWMP Checklist
2
Plan Preparation
3
System Description
4
System Water Use
B Distribution System Water Losses (AWWA Audit)
Water Savings City Ordinance and Water Code
C
Sections
D SB X7-7 Verification Tables
5
Baseline and Targets
E DWR Population Tool Output
6
System Supplies
F Chromium VI Corrective Action Plan
7
Water Supply Reliability
8
Water Shortage Contingency Plan
9
Demand Management Measures
Plan Adoption, Submittal and
10
Implementation
G 2014 Consumer Confidence Report
H Patterson Rate Structure
I
Water Shortage Contingency Plan/Ordinance
J
2013-2014 Best Management Practice Report
K Notification letters
L Public notice of UWMP hearing
M Adoption resolution
Population and Demand Analysis
Population from Census data and planning projections
Population - Current and Projected
Population
Served
2015
2020
2025
2030
2035
2040(opt)
21,250
30,375
36,429
42,483
48,538
54,592
Demand analysis/projections from RMC Water Master Plan effort
Developed from: Billing records, connection density and land use (existing and buildout)
2015
2020
2025
2030
2035
2040
Potable Average
Annual Demand
(AFY)
3,000
5,073
6,756
7,718
8,680
9,642
Non-Potable
Average Annual
Demand (AFY)
216
1,302
1,517
1,731
1,945
2,159
Total (AFY)
3,216
6,376
8,272
9,448
10,625
11,801
Supply Analysis
Supply Analysis from RMC Water Master Plan effort
Assessment of City’s existing supply and buildout demand to determine supply gap
Water Demands
AFY
Current Supply (GW)
4,000
Planned Potable Wells
1,355
Planned Non Potable Well
1,032
Projected Demand (in 2050)
15,803
Supply Gap (in 2050)
9,416
Supply Analysis
Supply Analysis from RMC Water Master Plan effort
Assessed many water supply options to determine recommended supply portfolio for the City
Total
Groundwater Use
for NP, 1,032
Patterson RW for
NPW, 1,512
Conservation,
1,500
Total Supply (AFY)
15,859
Stormwater
Capture, 1,700
Total
Groundwater Use
for Potable,
10,115
Supply Analysis – Future Supply Portfolio
Future Water Supply by Source
14,000
12,000
Water Supply (AFY)
10,000
8,000
6,000
4,000
2,000
0
2015
Groundwater
2020
Recycled Water
2025
2030
Stormwater Use
2035
2040 (opt)
Additional Conservation
Supply Analysis
What will be the City’s supply with this portfolio in the case of
a drought?
Volume Available
with Complete
Supply Portfolio (AF)
% of Avg
Supply
Average Year
11,801
100%
Single-Dry Year
11,801
100%
Multiple-Dry Years 1st Year
11,801
100%
Multiple-Dry Years 2nd Year
11,801
100%
Multiple-Dry Years 3rd Year
11,801
100%
Year Type
Per Capita Use Calculations and
Compliance
 Senate Bill X7-7 (20x2020) requires reductions in per capita
water use
 Established gallons per capita per day (GPCD) baseline
(2010) and 2015 and 2020 targets
 Baseline – 169 GPCD
 2015 Target – 167 GPCD*
 2020 Target – 164 GPCD*
 City’s 2015 water use: 135 GPCD
 Well below the 2015 (and 2020) target
*Changed since 2010 UWMP
Demand Management Measures and
Water Shortage Contingency Plan
 The City’s Demand Management Measures include:
 Water waste prevention ordinance
 Metering
 Public education and outreach
 Water conservation program
coordination and staffing
 Water Shortage Contingency Plan
 Plan for demand reduction in times of decreased water supplies
Stages of Water Shortage Contingency Plan
Stage
Percent Supply
Reduction
Water Supply Condition
Prohibition and Penalties
1
<10%
Up to a 10% Reduction in City
Supply
2
10-20%
10-20% Reduction in City
Supply
3
>20%
Above a 20% Reduction in City
Supply
Water waste prohibition and
voluntary reductions
Mandatory reductions (limits on
non-essential use)
Mandatory reductions
(rationing)
Adoption Schedule
Deliverable/Deadline
City Council Water Workshop
Date(s)
March 14
Begin public notification regarding UWMP
preparation (website, paper, bills)
April 1
2015 UWMP Presentation to City Council
April 19
Public Review Period
Council Meeting – adoption of 2015 UWMP
April 22 - May 25
June 7
Second Council Meeting if not adopted 7/7
June 21
Submittal to Dept. of Water Resources
July 1
Questions?