Storm overwhelmed drainage system

City engineer Guy Cicon said that upgrades to the city's storm sewer system are necessary to stop storms from overwhelming it.

A section of Third Avenue near Bute and Burde streets was closed on the night of Dec. 5

The Dry Creek flood mitigation is only a piece of a long-term puzzle in flood-proofing lower Third Avenue, said city engineer Guy Cicon.

“The flooding we received on Third and Fourth Avenue (on Saturday) is independent of the work that we did on Dry Creek,” said Cicon.

City crews were forced to close a section of Third Avenue between Bute and Burde streets Saturday night as standing water became a hazard.

The deficiency lies with the city’s aging sewer infrastructure, said Cicon.

“When we reached 5 millimetres per hour (of rain), the rainfall exceeded the capacity of the underground drainage system,” Cicon said. Precipitation reached that rate for four or five hours during the afternoon and early evening of Saturday, Dec. 5.

“This was a very intense rainstorm event.”

While city crews cleaned out storm water pipes over the summer in preparation for possible winter storms, Cicon said that the system just isn’t sufficient for hours of 5 mm per hour rains.

“Despite the storm drainage maintenance that we did this summer, the volume of water exceeded the capacity of the system.”

In order to head off more flooding, the city is considering installing another storm water drainage outlet into Dry Creek.

“We are looking into installing another storm water outlet into Dry Creek at Bute Street to relieve the hydraulic pressure in the catchment area,” said Cicon. The city already has one drainage outlet in the area.

The catchment area’s inability to keep up with the storm water during heavy rainfall is why the manhole at Burde Street and Fourth Avenue always blows.

“That’s called surcharging and it’s when the system is at its capacity and water escapes through the manhole. We had an inch of rain over four hours—we just don’t have the capacity for that.”

The storm water outlet could be installed in the coming months, Cicon said.

“We have to do some analysis and engineering on the project and if we can we will do it in the next two or three months.”

In the long term, Cicon said that the city will continue along its storm water management plan.

“Our long-term storm water management plan is to separate our storm water from our combined sewer system,” he said.

Separating storm water from sanitary sewers has been a decades-long project for the city, Cicon said, adding that the more separation there is in the city’s sewer system, the better its storm water management will be.

“We’ll separate that in the Bute Street catchment area.”

reporter@albernivalleynews.com

twitter.com/AlberniNews

Just Posted

Port Alberni’s West Coast Rangers hold rendezvous

Three-day event featured historical re-enactment

Port Alberni Port Authority talks logistics for cruise ship visit

Some restrictions for pedestrians, boaters will be in place

Port Alberni’s ‘Army of Problem Solvers’ to the rescue

Facebook group gathers people who just want to help their neighbours

Hurricane Katrina inspires Alberni author’s new novel

Jacqueline Swann brings message of climate change to life with story of fictional journalist

Port Alberni RCMP searching for missing teenage girl

16-year-old Lasheena Seward was reported missing from a group home on May 9

600 new campsites coming to provincial parks and recreation sites across B.C.

Tourism Minister announced half of the new spots to 13 most popular provincial parks

B.C. Supreme Court dismisses review around ferry workers’ right to strike

B.C. Ferry and Marine Workers’ Union collective agreement expires November 2020

Municipalities protest after B.C. declares marijuana crops ‘farm use’

UBCM president seeks answers in letter to John Horgan government

CMHC defends mortgage stress test changes amid calls for loosening rules

Uninsured borrowers must now show they could service their mortgage if rates rose two per cent

B.C. woman left ‘black and blue’ after being pushed off 40-foot cliff at lake

West Shore RCMP looking for witnesses as investigation continues

Thunderstorms to bring heavy rain, risk of flash floods in the southern Interior

Ten to 30 millimetres of rain to fall over the early weekend

Unbe-leaf-able: Agassiz man finds more than 200 four-leaf clovers in a month

Walt Hardinge has found more than 219 four-or-more leaf clovers this spring alone

Crews fight fire with fire to keep blaze from northern Alberta town

The wildfire now covers some 920 square kilometres

Man in B.C. charged with murder and arson in 2016 New Brunswick death

He is charged in the death of 71-year-old Lucille Maltais, who was found inside a burned down home

Most Read