Project Background

On November 26, 2024, West Kelowna City Council approved $2.5 million in funding to improve the source water quality at the Rose Valley Reservoir. Since the City assumed management of the water system in 2011, the reservoir has experienced increasing water quality challenges. The improvements aim to address key concerns such as manganese levels, algae growth, and other source water quality issues.

The upgrade project includes:

• Installation of a potassium permanganate treatment system
• Intake improvements
• Aeration system enhancements

The top priority is the potassium permanganate dosing system, which is essential for managing rising manganese levels expected during the summer months.

Potassium Permanganate Dosing System

The City is currently reviewing supplier submissions received through a Request for Quotations process for potassium permanganate systems and chemical pump skids. These systems will:

• Control chemical concentrations
• Ensure consistent flow rates
• Dose potassium permanganate into the water intake pipe leading to the treatment plant

Installation and Commissioning Timeline:

• Equipment arrival: June 2025
• Installation and integration: By City staff and electrical contractor Centrix
• Integration: With Rose Valley Water Treatment Plant’s communications systems

A manganese analyzer has already been installed and is actively sending real-time data to City operations staff. Should manganese levels rise before the new system is in place, chlorine will be used at the plant to oxidize manganese and enable its removal during treatment.

Aeration System Improvements

To further enhance water quality, the City, in collaboration with AECOM and Larratt Aquatic, is working on the design of a new aeration system for the reservoir. These improvements are targeted to:

• Reduce algae blooms
• Lower dissolved manganese
• Improve taste and odour of drinking water

Timeline:

• Design Completion: 2025
• Installation: Spring 2026

In the meantime, the existing aerator has been upgraded, increasing air flow and improving oxygen levels in the reservoir. Early monitoring indicates a larger zone of influence and better water quality. These interim improvements will continue to be monitored over the summer.

Power requirements for the new system have been confirmed by BC Hydro. The system is being designed to operate within the current power availability, with future scalability planned through the addition of three-phase power.

Project Risk Assessment

Risk is being actively managed through a Risk Log, maintained collaboratively by City staff and the project team. The log is regularly updated to identify and mitigate any potential project risks throughout all phases of design, procurement, and installation.