1. Seattle Pipe Replacement Precedence
Main & Service Waterlines
Prepared by: Myron Basden
Steven Flowers
Jenny Pearson
Yuriy Stryzheus
Kerry Sullivan

2. Introduction General look at Seattle’s waterline network.
Factor’s affecting pipe’s vulnerability.
Suggestions on pipe replacement or maintenance.

3. Seattle’s pipe network

4. Factors Affecting Pipe’s Vulnerability
Soil corrosivity
Age of a pipe
Pipe’s Material

5. Pipe Replacement or Maintenance
Level of Urgency:
LOW – 1 factor exists
MEDIUM – 2 factors exist
HIGH – 3 factors exist

6. Pipe Condition Based on 1 Factor
Soil Corrosivity is based on a buffer zone of 70’. or

7. Pipe Condition Based on 1 Factor

8. Pipe Condition Based on 2 Factors
Soil Corrosivity is based on a buffer zone of 70’. or

9. Pipe Condition Based on 2 Factors

10. Pipe Condition Based on 3 Factors
Soil Corrosivity is based on a buffer zone of 70’.

11. Pipe Condition Based on 3 Factors

12. Conclusion Table 2. Summary of Results Main Lines Service Lines
Main Lines
Service Lines
Length (miles)
% of total
Number of Segments
Red - High Risk
OBC
8.28
0.5
0.00
Subtotal
Orange - Medium Risk CO
1.09
0.1
351
0.21 OB
760.03
44.2 7 CB
5.25
0.3
766.37
44.5
358
Yellow - Low Risk C
16.84
1.0
498
0.30 B
521.40
30.3 16
0.01 O
65.26
3.8
90347
53.96
603.49
35.1
90861
54.27
Total % at Risk
80.1
91219
54.48
Other Pipes
342.14
19.9
76203
45.52
TOTALS
100.0
167422
100.00
Key: O = installed before 1944 (old), B = cast iron pipe (brittle), C = corrosive soil
Conclusion

14. Questions?
Thank You!