Rose Valley Reservoir is the primary water supply for the Lakeview Water System.
A small dam in Bear Creek diverts freshet from the watershed to a pipeline that feeds into the reservoir.
The reservoir was created in 1949 as a result of the construction of the Rose Valley Dam.
Water Treatment Methods
Lakeview's system is unflitered, but it does employ two other methods of water treatment.
The first is aeration in an area immediately upstream of the Bear Creek intake. The second is chlorination, which occurs via a treatment plant as water leaves Rose Valley Reservoir.
The service area's boundaries span approximately 930 hectares, including 226 hectares of irrigated orchards. There are an estimated 4,000 service connections providing potable water to approximately 11,000 users. The Lakeview System serves neighbourhoods including:
West Kelowna Business Park
The Lambly Creek Watershed has a drainage area of 245 square kilometres upwards of the Rose Valley Dam diversion. If the area is expanded to include the point at which the water drains into Okanagan Lake, the watershed area covers 272 square kilometres.
The watershed rises from an elevation of 342 metres at Okanagan Lake's surface to 1,870 metres at the Lambly Creek Headwaters and the divide of the Nicola River system to the west.
Most of Lambly Creek and its principle tributaries are deeply incised in narrow valleys. As it nears Okanagan Lake, Lambly Creek flows through a deep canyon where the stream drops 90 metres over a distance of 1 kilometre.
Initially built in 1994, the reservoir, with a surface elevation of 1,357.5 metres at full pool, was raised by 3 metres in 2004. The maximum depth is 21.3 metres. The reservoir draws its water from a 34.7 square kilometre watershed. This can be expanded a further 7.84 square kilometres through use of the Dun Waters Creek Diversion, which was constructed in 2009.
The reservoir, with a surface elevation of 1,617 metres at full pool, is located at the headwaters of Esperon Creek, a tributary of Terrace and Lambly Creeks. The lake has a surface area of 0.212 square kilometres and a storage capacity of 190,000 cubic metres. Water is released through a 167 square centimetre (26 square inch) slide gate into a 154 square centimetre (24-square-inch) steel pipe.
The reservoir, with a surface elevation of 598 metres, stores approximately 5.6 million cubic metres of water, which is continually refreshed through a supply line from Lambly Creek. Annually, up to 4.8 million cubic metres of water is drawn from the reservoir to serve residences, business, industry and agriculture.
The reservoir was created following the construction of a dam in 1949. In 1978, the dam was raised a further 5 metres to its present height of 25 metres.
The City conducted dam safety reviews for the Westbank and Lakeview Water Systems in 2014 for 13 dams that require safety reviews, one being the Rose Valley Reservoir Dam. The review of the Rose Valley Dam indicates that the dam is safe, but that a recommendation to install a draw down ditch be investigated. The City will review the installation of a draw down ditch in conjunction with development of a new treatment plant, for which the City is actively pursuing funding support from other levels of government.
The City continues to monitor and conduct routine inspections of its dam infrastructure and reservoir levels and has action plans in place to alleviate any pressures from increased water run-off. After years of history with the Rose Valley Dam, the City can effectively predict impact to reservoir level based on snow pack levels in the watershed and climate activities and adjust inflow accordingly. West Kelowna provided a Dam Emergency Plan which was accepted by the Dam Safety Officer in 2016.