Network Operation & Management
Pressure management is one of the fundamental elements of a well-developed leakage management strategy. The rate of leakage in water distribution networks is a function of the pressure applied by pumps or by gravity. There is a direct relationship between leakage flow rate and pressure and the frequency of new bursts is also a function of pressure.
To assess the suitability of pressure management in a particular system, RWS can carry out a series of tasks, including:
- Identify potential zones, installation points, and customer issues through a desktop study
- Identify customer types and control limitations through demand analysis
- Gather field measurements of flow and pressure (the latter usually at inlet, average zone point, and critical node points)
- Identify correct control valves and control devices
- Analyse the costs and benefits
Remote Monitoring System development
District Meter Areas (DMAs) are an important tool in reducing NRW as it allows for continuous monitoring of isolated water supply networks. This monitoring enables rapid awareness of NRW problems and then subsequent analysis and reduction activities enables easier management of NRW. It is intended that each DMA meter have a flow and pressure data logger installed in the meter cabinet. These data loggers would record data continually and send the recorded data back to the control room via SMS on a daily basis. The monitoring of the individual DMAs, through SMS data loggers is important in that it alerts the water company immediately that a problem occurs and reduces the subsequent time to repair. This ultimately reduces the volume of water lost.
Reservoir overflow is a component of NRW that needs to be monitored and overflow occurrences dealt with as expediently as possible. For continous monitoring, pressure loggers with SMS facilities and level sensors can be installed at all reservoirs to record the trend of level and to trace any overflows and all of this data will be transmitted to the control room via SMS. The monitoring of the individual reservoirs, through SMS data loggers is important in that it alerts the water company immediately that a problem occurs and reduces the subsequent time to repair. This ultimately reduces the volume of water lost.
As with all electronic systems it is important to verify their functionality on a regular basis to ensure that they are working correctly. RWS can provide dedicated reservoir monitoring teams, equipped with necessary tools, to undertake yearly analysis of the reservoir level monitoring, ensuring its accuracy.
Most of the reservoirs will have altitude valves installed to control the level of the reservoir, thus ensuring no overflows. The reservoir monitoring team will undertake regular visits to each reservoir to undertake regular maintenance, servicing and replacement (if necessary) of the altitude valves and to check the status of the reservoir level sensors.