North Vancouver Water Model Assessment and Audit

Water Street Engineering Ltd. (WSE) completed an assessment of the City of North Vancouver’s water system hydraulic model to develop a model-updating plan.  WSE reviewed the existing H20net model against the City’s record drawings, source flow records, and facility information.  Model update recommendations were developed to improve accuracy and develop confidence in the model output.

WSE also completed a water audit following AWWA M36 methodology.  This component of the work included:

• Review of existing water loss and unaccounted for water information.
• Review of source flows including night-time flows.
• Summation of billed metered authorized consumption (from industrial, commercial, and institutional meter data).
• Developing estimates of billed un-metered authorized consumption (residential un-metered demands).
• Estimates of un-billed un-metered usage and apparent losses (un-authorized consumption, metering inaccuracies).
• Calculation of non-revenue water.
• Compiling system data for calculation of the City’s Infrastructure Leakage Index (ILI).
• Assessing and recommending components for a water loss management program to improve current understanding of water usage and build on the results of the audit.

As a result of the audit recommendations were made to improve understanding of water use within the City and to reduce water loss.