2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...

Chapter 5 Water Infrastructure
5.2.3 Water System
The SPU Water System is comprised of transmission and distribution pipelines, and storage
facilities and pressure zones. The system extends far beyond the Seattle city limits (Figure 5-1).
Figure 5-1
SPU Water Transmission System
5.2.3.1 Transmission System
The SPU regional and sub-regional water transmission system includes 189 miles of 16- to 96-
inch steel, ductile iron or concrete pipeline. Some of the large transmission pipelines are the
following:
Lake Youngs supply lines 4 and 5
Cedar River pipelines 1 through 4
Tolt pipelines 1 and 2
Eastside supply line
Mercer Island pipeline
West Seattle pipeline
SPU Design Standards and Guidelines
5-5