Mount Cheam in B.C.’s eastern Fraser Valley. (Wikimedia Commons)

High snowpack could lead to floods in wildfire-ravaged B.C. interior

Provincial snowpack sits at 127 per cent as of April 1

A higher-than-usual snowpack in April could lead to increased flooding risk in B.C.’s wildfire-ravaged interior, officials say.

River Forecast Centre hydrologist Jonathan Boyd said this winter’s snowpack sits at 127 per cent – 32 percentage points higher than last winter’s.

“The provincial average was 123 per cent of normal in 2012 … and there was considerable flooding throughout the province,” Boyd told reporters Monday.

Areas like the Okanagan and Similkameen, where the snowpack sits at a record-breaking 152 per cent, could be at risk for higher flooding. The risk for anything above 135 per cent is extreme.

“Last year in the Okanagan, the snowpack was 105 per cent of normal, but the lake still experienced record inflows,” Boyd said.

A higher-than-normal flood risk is expected in the centre’s Cariboo Chilcotin, Thompson Okanagan, west coast and Kootenay Boundary regions, where wildfires burned hundreds of thousands of hectares of forest last summer.

The risk comes as fires burn away trees that provide shade and allow for slower melting.

Heavy melts in those regions could lead to riverbank erosion, as well as damage to dikes.

“Due to the fires, there’ll be a lot more debris in rivers going downstream … which can lead to erosion along banks and dykes,” Boyd said.

However, he cautioned that snowpacks were only one facet of flood risk.

“Weather patterns during the snow melt season play a critical role in weather or not flooding occurs,” he added.

“Intense or prolonged rainfall or extreme temperatures are important factors that can lead to flooding even in areas with a normal snowpack.”

B.C. spent most of this past winter under La Nina conditions, which tend to be cooler and accumulate more precipitation for B.C.’s southern half.

The April snowpack statistics are important, he said, because 95 per cent of the snowpack for the year has already accumulated.

However, with this year’s La Nina conditions, snow could continue to pile up throughout April and May.

“Snow basin indices tend to increase by two to five per cent in April,” said Boyd.

Snowmelt in B.C. typically begins in mid- to late-April.

Just Posted

Purpose-built rental building under construction in White Rock

The four-storey, 28-unit facility is to be complete by late next year

James Good named Surrey’s Citizen of the Year

Resident has been volunteering since 1988

Make ‘Salmon Tracks’ in Surrey this summer, city challenges residents

‘We have 1,500 kilometres of creeks, and what gets into those drains isn’t treated,’ city staffer says

Keen eye for detail key for North Delta artist

Photographer Murray Klassen’s work will be on public display at MLA Ravi Kahlon’s office all summer

Some Surrey roads will be closed to traffic during Miri Piri parade on July 28

Closures in effect 9:30 a.m. to 2 p.m. or until RCMP determines the roads are safe to be reopened

BC Games’ Athletes Corner: What’s your favourite pump up song?

Check out what’s playing in the earbuds of BC Summer Games athletes before they compete

RCMP help to save goats from wildfire

The fast-approaching wildfire, sparked Thursday, forced the evacuation of five homes

VIDEO: Near drowning captured on popular B.C. river

Search and Rescue manager says the popular pastime of floating in the summer is inherently dangerous

Crosswalk vandalism leaves black mark for Cowichan as B.C. Games begin

Rainbow crosswalk defaced just days after being painted

Photo gallery: BC Games Day 1

A brief look at action from the 2018 BC Summer Games in the Cowichan Valley

UPDATED: Anti-pipeline campers digging in as eviction deadline expires

The City of Burnaby had ordered the Kinder Morgan pipeline protesters out for violating bylaws

Trump was taped talking of paying Playboy model: AP source

Source says former personal lawyer Michael Cohen secretly recorded discussion prior to 2016 election

BC toddler with ‘allergy’ to sun waiting for bone marrow transplant

Charlie Lock, 2, needs treatment for damage caused by rare disorder EPP

VIDEO: How to throw a frisbee

Ultimate frisbee player Amy Mackay shows off the proper technique

Most Read