Quantifying Inflow and Infiltration via Dyed Water Flooding
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1 Quantifying Inflow and Infiltration via Dyed Water Flooding Prepared by Anna Kesler, E.I.T. Catherine Morley, P.E.
2 Overview Historical background to City of Elmhurst I/I issues What Is Dye Flooding? What did we find? How did our findings change our Rehabilitation Recommendations?
3 Background City of Elmhurst, IL Population 46, s undertook extensive comprehensive SSES and rehab Manhole rehabilitation Sump pump disconnections Relief sewers Significant flow reduction 36 permitted ESOs 12
4 Map of Elmhurst
5 Background 2010 severe storm: 6.84 in 12 hours > 100 yr. Overland flooding Power outages Basement backups South Elmhurst very severely affected Consent Decree mitigate SSOs
6 South Elmhurst Backups
7 SSES Phase II South Elmhurst Comprehensive Smoke Testing High Smoking Inlet Follow-up Dye Flooding Catch basins & inlets high/medium smoke
8 What Is Dyed Water Flooding? Follow-up to smoke testing Simulates extreme storm event Pinpoint sources of Cross-Connections between the Storm and Sanitary Sewer collection systems
9 Cross-Connections
10 What Is Dyed Water Flooding? Follow-up to smoke testing Simulates extreme storm event Pinpoint sources of cross-connections between storm and sanitary sewer collection systems Visual observation of active leaks in sanitary sewers
11 Dyed Water Flooding Methodology Calculate flow in sanitary sewer Prior to beginning test Plug adjacent storm sewers with pneumatic plugs
12 DANGEROUS!
13 Dyed Water Flooding Methodology Calculate flow in sanitary sewer prior to beginning test Plug adjacent storm sewers with pneumatic plugs Fill storm sewer with dyed water via inlet or storm manhole Allow storm sewer to fill to capacity and exfiltrating
14 Dyed Water Flooding Methodology Observe sanitary sewer until dyed water is seen Begin sanitary sewer CCTV Inspection Record defects and estimate flow quantities Calculate flow in sanitary sewer at end of test
15 Data Collection Mobile data collection using ipads RJN developed software using iform Data uploaded to icloud multiple times/day downloaded to RJN Servers Live data viewable in office
16 Study Areas Basin 18 > 90% inlets/catch basins smoked
17 Basin 18 Smoking Storm Structures
18 Study Areas Basin 18 > 90% inlets/catch basins smoked No recorded incidences of basement backups Immediately upstream McKinley Interceptor Top of the Hill Basin 20 On the McKinley Interceptor Most sewers are lined
19 South Elmhurst Backups
20 Mainline Leaks - Video Joint Leak Cracked Pipe
21 Lateral Connection - Video
22 Leaking Lateral - Video
23 Plugged Lateral - Video
24 Results Storm sewers exfiltrating 0.5 to 350 gpm No correlation between smoke intensity and magnitude of leaks Significant Interstitial Flow
25 Interstitial Flow Flow between liner and host pipe Lining does not remove I/I moves elsewhere Connections Laterals Manhole pipe seals 130 gpm 183 segment all 7 connections leaking
26 Interstitial Flow - Video
27 Manhole Leaks Video
28 Cottage Hill Avenue
29 Cottage Hill Avenue 22 defects 195 gpm
30 Cottage Hill Avenue (con t)
31 Interstitial Flow Rehabilitation/Prevention Sewers Grout/T-Line every connection Grout/T-Line every non-pvc riser Seal manhole pipe seals Hydrophilic end seals Epoxy grout (previously lined sewers) between liner and host pipe. Curtain grout lower 18 of manhole with acrylamide grout.
32 Typical Rehabilitation Recommendations Line Sanitary Sewers Hydrophilic End Seals Seals the junction between sewer and liner at manhole Grout/T-line Laterals and Connections (as needed)
33 Revised Recommendations Line Sanitary Sewer - use end seals Grout every connection and 5 ft. lateral/riser Rehabilitate manholes (external grout etc.) T-line connection and lateral (case by case basis) Rehabilitate storm sewer leaking > 14 gpm TV Possible point repairs Line/grout storm sewer (dependent on size)
34 Conclusions No correlation between smoke intensity and excess flow Only lining sanitary sewers does not solve I/I problem High quantities of interstitial flow
35 Conclusions Consider storm sewers in rehab equation Each sewer segment may require individual rehab No cookie-cutter approach
36 Questions??
37 Thank You
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