"Web & Flow" - Sewer Overflow and Flow Monitoring and Alarm Notification System With web based real time data provided over the GPRS (General Packet Radio Service) network.

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Web and Flow Meter

GPRS Modem unit, 12 month power supply and Ultrasonic sensor.

GPRS Modem Unit with 1mm tipping bucket rain gauge.

The same monitor can provide rainfall data as well as flow, depth, temperature and battery voltage data. With it's own internal storage memory, there is no need for an additional data logger. 

Equipment installed in a 1050 dia manhole on a 150 dia sewer line. This site is an overflow manhole, that discharges to a storm drain when the level exceeds 300mm. Notice the weir wall to the left of the main sewer channel.

By installing a volumetric compound weir in the outlet pipe, the flowrate as well as the depth of the flow can be determined. The weirs are accurate to between 2 to 5% of  low and medium flow regimes and when used in conjunction with the rain gauges, can be used to determine Inflow and Infiltration volumes. The depth over the weir is proportional to the flow and can be read directly off the weir plate or by the ultrasonic depth sensor & transferred back to the web page via the GPRS network. 

Shot of the volumetric weir installed in a 300mm diameter pipe.

Skilled Flow meter technicians trained in Confined Space entry install and calibrate the equipment. Installation, site measurements and calibrations are an essential part of the process to ensure excellent and sustainable data quality.  

Safety is a first priority at all confined space entries. Field managers and technicians always utilise fall arest equipment and continuous gas monitoring throughout the installation and inspection process.   

The clear polycarbonate cover on the IP67 casing enables inspection of the modem and SPE unit without removing covers.

In most cases where the cell phone coverage is reasonable, a short wire rope antenna on the unit is sufficient. Flush surface mounted antena can be used where signal strength is marginal.

The rain gauge assembly is mounted near the monitoring manhole and uses the same modem for data communications.

The unit shown is a 1mm tipping bucket. For greater resolution (for I/I studies) a 0.2 mm rain gauge can also be attached.

 

Alarm levels can be set to provide early warnings or predictive alerts as the system "learns" how the network operates under normal conditions. This approach uses a combination of sound engineering judgement and machine intelligence to minimise false alarms but still provide timely warnings for real overflow events about to occur.

Data can also be viewed on line at each client web site. In this example, data is collected every 15 minutes and uploaded hourly. Each tip of the rain gauge, or reaching an alarm pre-set also causes the GPRS upload to activate.