Montreal sewage dump: How it's going to work

Mayor Denis Coderre has announced that Montreal will go ahead with its controversial sewage dump at midnight tonight.

• Montreal sewage dump starts tonight at midnight

• TIMELINE: Montreal sewage dump saga

• St. Lawrence sewage dump: 7 tips to limit your impact

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Here's how it's going to work:

Wednesday, 12:01 a.m.: Valves are shut off

The valves bringing wastewaterto the 30-kilometre-longsoutheast interceptora major sewer pipethat collects the effluentfrom a network of other sewer lines on its waytothe watertreatment plant will be shut off.

The sewage will be diverted through discharge points along the St. Lawrence River.

The diverting of the water will last until work on the interceptor is completed.

Wednesday,approx.6 p.m.:Crews begin work

The southeast interceptor is expected to have dried out, allowing work crews to enter and start work on 14 deteriorating arches. The arches will bereplaced to increase the capacity of the interceptor.

Crews will also inspect areas of the interceptor, looking at layers ofsediment and the degree of concrete degradation.

Work crews will work in shifts, 24 hours a day, until work is completed.

Sewage diverted from boroughs, cities

While the southeast interceptor valves are shut off, the sewage will be diverted to discharge points along the river.

The boroughs and cities which had their sewage diverted to the southeast interceptor include:

• Lachine
• LaSalle
• Verdun
• South West
• Ville-Marie
• Outremont
• Mercier-Hochelaga-Maisonneuve
• Montreal West
• Cte-St-Luc
• Town ofMount Royal
• Westmount

Five other boroughs and three cities will have some of their discharge points used.

During the sewage dump, the city is asking citizens not togo into the St. Lawrence River andnot to flush certain items down the toilet.

Hover over borough or city to see what percentage of thesewage from each is to be diverted.