Contributed by BC Hydro
BC Hydro is preparing for a potential high water year in the Columbia, which could require storing additional water in both Kinbasket Reservoir and Arrow Lakes Reservoir for flood control.
For the Columbia and Kootenay facilities, slow snowmelt and dry summer weather could mean business as usual for the Columbia and Kootenay facilities; however, rapid snowmelt and heavy rainfalls could mean spill releases and above normal reservoir levels through the summer and fall.
At this time, snowpack levels on both the Canada and U.S. side of the border are higher than average. And with the cooler, wet weather this spring, snow is still accumulating at higher elevations. High snowpack and above-average spring rainfall means that runoff forecasts for the Columbia basin have continued to increase with each forecast update.
The current runoff forecast for the Columbia basin (Canada and U.S. combined) is 130 per cent of normal (from April to September). This is creeping closer to the last big water year in 2012 when the run-off was 135 per cent of average, higher than in any year since construction of the Columbia River Treaty dams.
In 2012, we closely coordinated the operation of Kootenay and Columbia facilities with the U.S. and other partners to successfully maintain downstream river flows well below peak flows experienced prior to dam construction. Flood operations in 2012 involved spill releases from Revelstoke Dam and extra water stored in Arrow Lakes, Kinbasket and Duncan Reservoirs.
Just like the weather, long-term forecasting is inherently uncertain due to the unpredictability of future events. Reservoir levels will depend on actual runoff volumes and patterns, system electricity demands, any upstream storage operations and Columbia River Treaty discharge requirements.
Our hydrologists, engineers and dam safety professionals will continue to closely monitor conditions and we will send regular advisories by email as conditions change. If you would like to sign up to receive these advisories, please contact Dayle.Hopp@bchydro.com.
We will also continue to send out our regular reservoir level and river flow information and weekly forecast for the upper and lower Columbia region every Friday. To receive these updates, please contact Dayle Hopp at Dayle.Hopp@bchydro.com.
We also have a toll-free reservoir information line 1-877-924-2444 that provides reservoir elevation and river flow information every Monday, Wednesday and Friday.
To learn more and talk directly to BC Hydro operations staff, visit BC Hydro’s annual operations update meeting at the Revelstoke community centre on June 22 from 4–7 p.m.