The number of pipe breaks, relative to the scale of the system, is a measure of the ability of the pipe network to provide a service to customers. The rate of water pipe breaks can also be seen as a surrogate for the general state of the network, although it reflects operation and maintenance practices too. It must be recognized, however, that highly aggregated reporting can hide the fact that sections of the network may be perpetually failing, whilst much of the remainder is in reasonable condition. Break rates for different materials, diameters or time periods laid can show where breaks are concentrated. Sewer blockages are, likewise, a measure of the ability of the sewer network to provide a service to customers. Blockages can reflect a number of issues including the effectiveness of routine operations and maintenance activities, the hydraulic performance of the network, and the general condition of the pipes. Bursts include failures on mains, service pipes where they are the responsibility, or at joints Utility’s or fittings, that are found by visible signs of water, not through leak detection by Utility staff. Sewer blockages include all blockages or collapses that occur in sewers or drains that are the Utility’s responsibility, whatever action is needed to clear them. F. Operating Costs & Staff F.1 Indicators INDICATOR UNIT CONCEPT 11.1 Unit Operational Cost US$/m3 sold Total annual operational expenses1/Total annual W&WW volume sold. 11.2 Unit Operational Cost Total annual operational expenses1/Total annual US$/m3 W&WW water produced. produced US$/m3 sold Annual water service operational expenses1/Total 11.3 Unit Operational Cost annual volume sold. Water only – 11.4Operational Cost Split - % Split of the total cost into water and wastewater % Water 11.5Operational Cost Split - % % Wastewater 11.6 Unit Operational Cost US$/WW pop Annual wastewater operational expenses1/ – Wastewater served Population served 12.2 Staff Total number of staff expressed as per thousand W&WW/’000 #/’000 W&WW conn. W&WW connections conn 12.1 Staff conn. #/’000 W W/’000 W conn WW #/’000 12.5 Staff WW/’000 WW conn conn
The number of pipe breaks, relative to the scale of the system, is a measure of the ability of the pipe network to provide a service to customers. The rate of water pipe breaks can also be seen as a surrogate for the general state of the network, although it reflects operation and maintenance practices too. It must be recognized, however, that highly aggregated reporting can hide the fact that sections of the network may be perpetually failing, whilst much of the remainder is in reasonable condition. Break rates for different materials, diameters or time periods laid can show where breaks are concentrated. Sewer blockages are, likewise, a measure of the ability of the sewer network to provide a service to customers. Blockages can reflect a number of issues including the effectiveness of routine operations and maintenance activities, the hydraulic performance of the network, and the general condition of the pipes. Bursts include failures on mains, service pipes where they are the Utility’s responsibility, or at joints or fittings, that are found by visible signs of water, not through leak detection by Utility staff. Sewer blockages include all blockages or collapses that occur in sewers or drains that are the Utility’s responsibility, whatever action is needed to clear them. F. Operating Costs & Staff F.1 Indicators INDICATOR UNIT CONCEPT 11.1 Unit Operational Cost W&WW 11.2 Unit Operational Cost W&WW US$/m3 sold US$/m3 produced Total annual operational expenses1/Total annual volume sold. Total annual operational expenses1/Total annual water produced. 11.3 Unit Operational Cost – Water only 11.4Operational Cost Split - % Water 11.5Operational Cost Split - % Wastewater 11.6 Unit Operational Cost – Wastewater US$/m3 sold % % US$/WW pop served Annual water service operational expenses1/Total annual volume sold. Split of the total cost into water and wastewater Annual wastewater operational expenses1/ Population served 12.2 Staff W&WW/’000 W&WW conn. 12.1 Staff W/’000 W conn. 12.5 Staff WW/’000 WW conn #/’000 W&WW conn #/’000 W conn #/’000 WW conn Total number of staff expressed as per thousand connections
IBNET%20indicator%20definitions%20-%202017.docx