TACOMA WATER RESILIENCY

Providing Clean, Reliable Water Now And In The Future.

Built-in Resiliency

RESILIENCY IN SOURCES AND SYSTEM• Reliable, high-performing system

• Protected watershed

• Redundant pipelines feeding City by gravity

• Large groundwater source with actively managed groundwater protection

• Extensive interties with other utilities

Tacoma Water’s Supply System

Source Resiliency

• Surplus capacity

• First and Second Diversion Water Rights, North Fork Wells

• In-town groundwater sources

1998

2000

2002

2004

2006

2008

2010

2012

2014

2016

2018

2020

2022

2024

2026

2028

2030

2032

2034

2036

2038

2040

2042

2044

2046

2048

2050

2052

2054

2056

2058

2060

0

20

40

60

80

100

120

140

160

180

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

HISTORICAL FORECAST

Mill

ions

of

gallo

ns p

er

day

Climate Change Resiliency

Infrastructure Resiliency

• Large, redundant storage reservoirs

• High quality, long lasting materials for water mains

• Looped distribution mains (where possible)

• Buried, welded steel pump stations

• Substantial portable power generation capacity

Business Resiliency

Strategic Asset Management PlansASSET MANAGEMENT• 18 Strategic Asset Categories• Using new maintenance strategies to focus

work on critical, risk prone assets.• Starting a Strategic Maintenance

Management Program.• Conducting Business Case Evaluations to

determine which assets to rehabilitate (and when).• Reliability Centered Maintenance for some

highly critical assets

Work Force Changes

Past performance is not a predictor of future resultsForecasted and Actual Demands (1954-2060)

9

25

45

65

85

105

125

145

165

185

1954 1964 1974 1984 1994 2004 2014 2024 2034 2044 2054

Mill

ion

Gal

lons

per

Day

, Ave

rage

Day

Dem

and

Actual Historical Demand with Losses 1985 Water Demand Forecast (EES) 1991 Water Demand Forecast (TPU)

1993 Water Demand Forecast (EES) 1995 Water Demand Forecast (EES and CH2MHill) - HIGH 1995 Water Demand Forecast (EES and CH2MHill) - LOW

1999 Water Demand Forecast (October 1999) (RW Beck) HIGH 1999 Water Demand Forecast (October 1999) (RW Beck) LOW 2003 Demand Forecast Draft Report (August 2003) (IUG) EXPECTED

2009 Demand Forecast (Fiske) EXPECTED 2012 Demand Forecast (Fiske) MEDIUM 2012 Demand Forecast (Fiske) LOW

Resiliency - Next Steps