City of Cranbrook

Water Treatment

The treatment facility is located at the Phillips Reservoir. Settled water is carried from the reservoir through a 750-mm diameter transmission main. The facility consists of the following unit processes:

a) Flow measurement
b) Chlorination
c) Fluoridation
d) Back-up disinfection – sodium hypochlorite
e) Booster pumps (for disinfection only)

As settled water enters the treatment facility from Phillips Reservoir, the turbidity is measured.  Fluoride is then fed into the flow. There are two booster pumps which inject chlorine at one point, which achieves a chlorine contact time of, approximately, 30 minutes. The flow rate through the system is also measured. Treated water leaving the facility into the distribution system is monitored for chlorine residual, pH, conductivity, dissolved oxygen and temperature.   City SCADA system records and trends all parameters and certified operators verify instruments daily with handheld field instrumentation.

The treated water is carried from Phillips Reservoir to the distribution system by a 750-mm diameter high pressure concrete pipeline. The transmission main is approximately 3,535 m long and was constructed in 1974. The 750-mm diameter pipe converges into two 600-mm diameter pressure concrete pipelines in the distribution system which supply the first PRV stations 

The City of Cranbrook’s primary water supply is from surface water obtained from Joseph and Gold Creeks, which divert raw water into the Phillips Reservoir. Raw water is settled in the reservoir assisting in the reduction of turbidity before the water is conveyed into the Treatment Facility.  The current method of treatment consists of inline chorine and fluoride injection before the water is conveyed to the City’s distribution system.

Existing instrumentation at the Treatment Facility provides ongoing data to the SCADA system for the following parameters:

• Flow measurement (Total Consumption)
• Reservoir Level
• Source turbidity
• Water pH and temperature
• Chlorine Residual
• Dissolved Oxygen
• Conductivity

The City of Cranbrook aims to produce water for drinking and other domestic purposes which are free of pathogenic organisms and their indicators.

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