A district metered area (DMA) is defined as a discrete area of a water distribution network. It is usually created by closing boundary valves so that it remains flexible to changing demands. However, a DMA can also be created by permanently disconnecting pipes to neighbouring areas. Water flowing into and out of the DMA is metered and flows are periodically analysed in order to monitor the level of leakage. [58] DMAs can principally be categorised into three different types: single inlet DMAs, multiple inlet DMAs and cascading DMAs, as illustrated in Figure 6.2 below:

References:

[22] Farley, M., Leakage Management and Control. WHO, 2001.

[58] Morrison, J., Tooms, S. and Rogers, D., District Metered Areas Guidance Notes.
IWA Publishing, London, United Kingdom, 2007.