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

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

Seattle’s pipe network

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

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

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

Pipe Condition Based on 1 Factor

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

Pipe Condition Based on 2 Factors

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

Pipe Condition Based on 3 Factors

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 1378.14 80.1 91219 54.48 Other Pipes 342.14 19.9 76203 45.52 TOTALS 1720.28 100.0 167422 100.00 Key: O = installed before 1944 (old), B = cast iron pipe (brittle), C = corrosive soil Conclusion

Questions? Thank You!