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

Chapter 5 Water Infrastructure
v2.1_Ch5_9.19.11
5.9 Water Storage Tanks, Standpipes and Reservoir Design ................................ 47
5.9.1 Planning .............................................................................................................................................................. 47
5.9.2 Water Storage Facility Structures ............................................................................................................... 51
5.9.3 Hydraulic Mixing for Water Age and Water Quality Control ............................................................ 54
5.9.4 Water Level and Flow Measurement ......................................................................................................... 56
5.9.5 Mechanical Appurtenances and Equipment .............................................................................................. 56
5.9.6 Standby Power ................................................................................................................................................. 59
5.9.7 Multi-Use Facilities .......................................................................................................................................... 59
5.9.8 Landscaping and Weed/Pest Control ......................................................................................................... 59
5.9.9 Access and Security ........................................................................................................................................ 60
5.9.10 Water Quality Monitoring/Sampling ................................................................................................ 61
5.9.11 Disinfection and Dechlorination ....................................................................................................... 62
5.9.12 Removal from Service .......................................................................................................................... 63
5.10 Construction ......................................................................................................... 65
5.10.1 Requirements for Protecting Water Mains and Appurtenances............................................... 65
5.10.2 Removal and Abandonment of Existing Water Mains and Appurtenances ............................ 66
5.10.3 Construction, Startup and Acceptance Procedures..................................................................... 67
5.10.4 Customer Impacts and Service Disruptions ................................................................................... 70
5.11 Resources .............................................................................................................. 71
Appendices
Appendix A: Access Port Standard Plans
Appendix B: Settlement Monitoring Requirements for Cast Iron Pipe
Appendix C: Settlement Monitoring Requirements for Ductile Iron Pipe
Appendix D: Inspection Guidelines for Water Storage Facilities
List of Figures
Figure 5-1 SPU Water Transmission System ................................................................................................................... 5
Figure 5-2 Typical Layout of SPU Water System Infrastructure ................................................................................ 7
Figure 5-3 Basis-of-Design Plan Sheet Data for Water Infrastructure .................................................................. 13
Figure 5-4 Controlled Density Fill ................................................................................................................................... 19
Figure 5-5 Typical Layout of a 16-inch or Larger Line Valve .................................................................................... 29
List of Tables
Table 5-1 AWWA Standards and Specifications for SPU Water Facilities .............................................................. 9
Table 5-2 AWWA Design Manuals for Water Supply Practice............................................................................... 11
Table 5-3 Design Criteria List for a Typical Water Facility Design (Example) .................................................... 15
Table 5-4 Standard Materials for SPU Distribution and Feeder Mains .................................................................. 18
Table 5-5 Valve Uses within SPU Water System ........................................................................................................ 30
Table 5-6 Corrosion Protection Requirements for Water Piping Systems* ....................................................... 36
Table 5-7 SPU Corrosion Protection Requirements for Corrosive Soil .............................................................. 36
Table 5-8 Steel Pipe Coating Types for SPU Water System .................................................................................... 37
Table 5-9 Ductile Iron Pipe Coating Types for SPU Water System ...................................................................... 38
Table 5-10 Sample Requirements for Routine Operation of Water Storage Facilities ..................................... 50
Table 5-11 Common Construction Conditions and Protection Measures for Water Mains .......................... 65
Table 5-12 Hazardous Materials associated with SPU Water System ................................................................... 67
5-ii
SPU Design Standards and Guidelines