Sewer Infiltration Monitoring SWIG Sensing in Water 2015
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1 SWIG Sensing in Water th September 2015 David Walters BEng CEng MCIWEM Principal Research Engineer Innovation
2 Background Widespread seasonal problem for many water companies Unaccounted for Water typically caused by groundwater entering the sewer through aged / defective pipework Can result in internal & external flooding and pollution Increased energy costs and wear at Sewage Pumping Stations Increased vehicle / tanker movements (24/7 in some catchments) Unhappy customers & stakeholders MP s, LA s, EA etc.
3 Background Thames Water experienced wide scale infiltration events during the winter of 2012/13 and 2013/14 Ongoing commitment to undertake investigations and investment in catchments at greatest risk Investigations include flow monitoring, catchment & groundwater modelling, PS analysis etc. Existing site investigation techniques lift & look surveys, CCTV surveys, impermeable area surveys, stoppering etc. Innovation considered alternative investigation techniques, both linked to temperature monitoring
4 DTS Distributed Temperature Sensing (DTS) Fibre-optic cable installed in a sewer with laser light pulsed along the length Temperature measurement recorded at 2m intervals every minute. Temperature differences identify inflows to sewer Service provided Royal HaskoningDHV with site contractor external power supply container laser/computer instrument manhole fiber-optic cable manhole sewer pipe manhole fiber-optic cable laser/computer instrument manhole sewer pipe battery pack
5 DTS Investigations Hambleden 1674m cable Monitoring Started 8th October 2014 Monitoring Ended 11th November 2014 Cuxham 1151m cable Monitoring Started 16th December 2014 Monitoring Ended 16th February 2015
6 DTS Hambleden Cable Installation
7 DTS Hambleden Cable Installation
8 DTS Example of Results
9 DTS Example of Results
10 DTS Example of Results
11 DTS Example of Results
12 DTS Pump run times
13 DTS Results Trial demonstrated the potential of the system and provided lots of data Timing of deployment critical to capture infiltration event Deployment required just prior to an event But, this is the unknown.. Technique also required jetting & CCTV Some operational problems ragging Costly
14 Temperature Loggers Temperature measurement is used to optimise sewage treatment processes Considered option to identify infiltration into sewerage networks? SLI51-KIT - USB-5 Temperature Data Loggers Reduced temperature could indicate infiltration Low cost equipment around 100 per logger Sealed units wireless data reader Trial undertaken within a catchment with previous history of infiltration: Fencott & Murcott Trial started September 2013
15 Temperature Loggers Temperature Logger Comparison Test Degrees C /02/ /02/ /02/2015 Date Comparable recordings from each logger 11/02/2015
16 Temperature Loggers
17 Temperature Loggers
18 Temperature Loggers
19 Temperature Loggers Very good diurnal pattern recorded
20 Temperature Loggers Merton
21 Temperature Loggers All sites - seasonal pattern over nearly 2 years
22 Temperature Loggers Infiltration Event Captured
23 Temperature Loggers Event with rainfall
24 Temperature Loggers
25 Temperature Loggers Pump run times
26 Temperature Loggers Pump run times
27 Temperature Loggers Other catchments Ramsdell
28 Summary Temperature loggers have provided good results to date Durable hardware survived in the sewers Potential to use in the network to target sources of infiltration or unaccounted for water Cost effective tool for long term measurement of catchment performance No confined space access needed Trial ongoing and rolled out to further catchments
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