| Description |
1 online resource (156 pages) |
| Contents |
Cover; Copyright; Acknowledgments; Abstract and Benefits; Table of Contents; List of Tables; List of Figures; List of Abbreviations; Executive Summary; Chapter 1.0: Introduction; Chapter 2.0: Project Design; 2.1 Location of the Project; 2.1.1 Description of Project Area; 2.1.2 Background: Why This Location Was Chosen; 2.2 Technology Used; 2.2.1 Description of Flood Grouting; 2.2.2 Other Technologies Considered; 2.3 Flow and Rainfall Monitoring; 2.3.1 Location and Installation of Flow Meters; 2.3.2 Location and Installation of Rain Gauges; 2.4. Model Design; 2.4.1 Continuous Simulation |
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2.4.2 Control Basin2.5 Quality Assurance Project Plan; Chapter 3.0: Business Case Development; 3.1 How SPU Develops and Applies Business Cases; 3.2 Quantification of Benefits and Costs for Flood Grouting; 3.2.1 Description of Alternative Methods; 3.2.2 Benefits; 3.2.3 Costs; 3.3 How SPU Develops and Tracks a Project Management Plan; 3.4 The Project Management Plan for the Flood Grouting Pilot Project; Chapter 4.0: Community Engagement; 4.1 Addressing Community Concerns; 4.2 Strategies to Building Community Acceptance and Participation; Chapter 5.0: Description of the Construction Process |
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5.1 Contracting and the Use of Sanipor5.2 Construction: Pre-Flood Grouting Activities; 5.3 Construction: Flood Grouting; 5.4 Construction Equipment; 5.5 Use of Remaining Grouting Liquids; Chapter 6.0: Project Results; 6.1 Construction Results; 6.2 Monitoring/Modeling Results; 6.2.1 Flow Monitoring; 6.2.2 Hydrologic Modeling; 6.2.3 Maintenance Hole Sealing; 6.3 Costs; 6.3.1 Comparative Costs; 6.4 Updates to Business Case Inputs; 6.5 Challenges and Lessons Learned; 6.5.1 Construction Challenges; 6.5.2 Side Sewer Issues; 6.6 Further Considerations; 6.6.1 Dealing with Side Sewers |
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6.6.2 Groundwater Issues6.6.3 Contracting; 6.7 Conclusions; Appendix A: Material Safety Data Sheets; Appendix B: Project Management Plan Materials; Appendix C: Community Engagement Information; Appendix D: Advanced Notice Flyers; Appendix E: Sealing Protocols; References |
| Summary |
The sewers in Seattle's Broadview neighborhood, built in the 1950s, experience significant inflow and infiltration. Intense wet weather events have resulted in sewer overflows into private residences and the environment and previous work indicates that the majority of this excess flow comes from infiltration. As a result, an infiltration reduction project was investigated to reduce overflows. To reduce that infiltration and achieve maximum success, all components of the sewer system mainlines, maintenance holes, and private side sewers have to be addressed. Seattle Public Utilities determined through a business case that to reduce infiltration, flood grouting was the most cost-effective, least-disruptive methodology. Flood grouting involves applying two chemicals in separate steps to treat an entire section of the sewer system between two maintenance holes, including the side sewers. The segment is filled completely to the maintenance hole rim and utilizes hydrostatic pressure by the chemical fluid to apply the grout to the system. To determine the success of the project, flow meters were installed in the system to document before and after conditions for modeling analysis. The effectiveness of this approach at reducing infiltration compared to the cost, the challenges associated with working on private property, and lessons learned are documented in this report |
| Subject |
Flood control -- Research
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Stormwater infiltration -- Research
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Urban runoff -- Management.
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SCIENCE -- Applied Sciences.
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Flood control -- Research.
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Urban runoff -- Management.
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| Form |
Electronic book
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| ISBN |
9781780404868 |
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1780404867 |
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