service connection per day in 2013. This has resulted in a reduction in system inputs of 40 million litres ( 10. 6 million gallons) per
day, reflecting a savings of $600,000 per year in electricity and
chemical costs related to water production.
More recently, Halifax Water has developed its pressure
management strategy to take its water loss control program
even further. As part of Water Research Foundation (WRF)
project #2928, Leakage Management Technologies (Fanner et al.
2007), Halifax Water utilized flow modulation to control pressure
This methodology is described fully in AWWA Manual M36,
Water Audits and Loss Control Programs. Since then, Halifax
Water has successfully transformed 55 pressure zones into 75
district metered areas (DMAs), incorporating approximately 110
pressure-control and meter stations.
Since adopting the methodology, the utility has reduced its
Infrastructure Leakage Index (ILI) from 9.0 to 2. 5, which represents a reduction in real losses from 540 litres (143 gallons) per
service connection per day in 1999 to 165 litres (44 gallons) per
The Evolution of
Carl Yates and Reid Campbell, Halifax Regional Water Commission
Halifax Water (Halifax, Nova Scotia) operates a large water system consist- ing of 1,500 km (932 miles) of transmission and distribution mains that serve a population of 350,000. In 1999, as part of its drive to control leak- age in the distribution system, the utility was the first in North America to adopt an international best practice developed by the International Water Association (IWA) and the American Water Works Association (AWWA).