Table 1 Components of Water Balance (Lambert, 2002)
|
System input volume |
Authorized consumption |
Billed authorized consumption |
Billed metered consumption (including water exported) |
Revenue water |
| Billed non-metered consumption | ||||
|
Unbilled authorized consumption | Unbilled metered consumption |
Non- revenue water | ||
| Unbilled non-metered consumption | ||||
|
Water losses | Apparent losses | Unauthorized consumption | ||
| Metering inaccuracies | ||||
| Real losses |
Leak on transmission and/or distribution mains | |||
|
Leaks and overflows at utility’s storage tanks | ||||
| Leaks in service connections up to customer meters |