Detection of misconnections using DTS (Distributed Temperature Sensing)

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1 1 Detection of misconnections using DTS (Distributed Temperature Sensing) Jes Vollertsen Professor, Aalborg Universitet M. Uggerby, EnviDan A/S, Silkeborg, Denmark J. Vollertsen, Aalborg University, Denmark A. Laustsen, Aarhus Vand A/S, Aarhus, Denmark C. Jensen, Per Aarsleff A/S, Åbyhøj, Denmark R. Schilperoort, Royal HaskoningDHV, Nijmegen, The Netherlands (and others, but the list would get too long)

2 2 Why bother about misconnections Storm drains connected to sanitary sewers Sanitary sewers are designed for dry-weather flow Misconnected storm drains cause sanitary sewer overflow Misconnected storm drains cause sanitary sewer flooding Sanitary drains connected to storm sewers Discharge of pathogens to sensitive waters Discharge of organic matter to sensitive waters Discharge of nutrients to sensitive waters

3 3 How to find sanitary sewer misconnections Run CCTV during rain, check if water comes from sanitary service laterals Problem: Difficult to plan being at a location during rain Add water to all storm drains and roof drains while inspecting the sanitary service lateral with CCTV Problem: Requires access to private property Problem: All drains must be found and accessible Add electronic marker chips to drains and detect if they pass the pipe further downstream Problem: Requires access to private property Problem: All drains must be found and accessible

4 4 DTS is an alternative hereto Temperature sensitive glass fiber cable Typical data for a medium sensitive setup: ± 0.1 C over several km of cable length Logging every minute Logging every meter

5 5 Pull the cable through the sewer Royal HaskoningDHV, 2013 Royal HaskoningDHV, 2013

6 Up side connections to get all of the pipe 6

7 7 Connect the cable to the DTS data acquisition computer Trailer for ease of installation Standard computer to upload data to an ftp server DTS

8 8 Test catchment and cable installation Water was added to all storm drains and roof drains while inspecting sanitary service laterals with CCTV Houses 10, 47, and 93 were identified having misconnections One we made ourselves

9 Raw dry weather data 9

10 12-Aug :00: Dividing the cable into the different stretches Aug :30: Aug :00: Aug :30: Aug :00: Aug :00:37 12-Aug :00:37 12-Aug :30:37 12-Aug :30:37 12-Aug :00:37 12-Aug :00:37 12-Aug :30:37 12-Aug :30:37 12-Aug :00: Aug :00: Aug :00:37 12-Aug :00:37 12-Aug :30:37 12-Aug :30:37 12-Aug :00:37 12-Aug :00:37 12-Aug :30:37 12-Aug :30:37 12-Aug :00: Aug :00: Temperature ( C) 24

11 Analyzing data manually Lateral inflows Flow direction Cable whined up and hanging in the manhole Cable creeping out of pipe invert, not being submerged fully when there is flow 11

12 Rainstorm on July 27, between 5:58 and 6:28 gave heavy inflow Street 1 Street 2 Known misconnection Unknown misconnection Street 3 Street 4 27-Jul :13: Jul :58:52 19 Date Jul :28: Jul :13:52 Temperature ( C) Jul :43: Jul :58: Jul :43: Street Main street 27-Jul :13:52 27-Jul :58:52 Date 27-Jul :43:52 27-Jul :28:52 27-Jul :13:52 27-Jul :58:52 27-Jul :43:

13 Automating the search for misconnection Algorithm that identifies any inflow event Identification in space as well as time Both dry and wet weather inflows Database with information on known connections Identified by CCTV inspection data Identified as locations with inflow Database with local rain events Rain gauge mounted on the DTS trailer Time, duration and intensity of events Linking databases to identify misconnections For example: Does a known lateral always show inflow when it rains heavily? Then it is a misconnection 13

14 14 The state of the algorithm Concept A rapid change in temperature in both time and space identifies an inflow event Approach A numerical filter identifies such locations One issue Not all identified inflow events are true inflows. Some are caused by the cable not lying straight in the pipe invert (Loch Ness Monster)

15 15 Concluding remarks DTS can identify misconnections without having to move onto private property More inflows were found than what a very detailed traditional inspection could identify Future work focuses on automating the routine, and finding the right balance between automation and manual data analysis Future work focuses on building an user-friendly, web-based platform showing DTS data and analysis results

16 16 That s it, folks

17 17 That s it, folks Royal HaskoningDHV, 2013

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