Adaptation of multiple regression analysis to identify effective factors of water losses in water distribution systems

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