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It’s Canadian Environment Week, and a great time to take a look at one of the City’s biggest projects with important environmental benefits – the Combined Sewage Storage Tunnel (CSST). This $232.3 million construction project is a key part of the Ottawa River Action Plan (ORAP), which is aimed at enhancing the health of the Ottawa River and protecting our water environment for future generations. A healthy water environment provides safe, abundant drinking water; supports agriculture, recreation and tourism; lessens the impact of flood events; and helps sustain fish and wildlife.
What is the CSST?
The CSST will consist of two massive inter-connected tunnels over six kilometres in total length and approximately three metres in diameter, located 10 to 31 metres below ground level.
The east-west tunnel will run under Slater and Cumberland Streets from LeBreton Flats to New Edinburgh Park, and the north-south tunnel will run below Kent Street from Chamberlain Avenue to just behind the Supreme Court. The project also includes support buildings, such as odour control facilities.
What will the CSST do?
The CSST will greatly reduce the frequency of sewage overflows during storms from entering the Ottawa River. During major rainfalls, such as the storms we experienced during the flooding in May, the tunnels will hold up to 43,000m3 of sewer overflow – that’s as much as approximately 18 Olympic-sized pools!
Once the rainfall subsides, the water held in the tunnel will be thoroughly treated at the Robert O. Pickard Environmental Centre to ensure it is safe for the public’s health and the environment before being returned to the river.
How will the CSST benefit Ottawa?
By keeping sewage overflow from entering the Ottawa River, the CSST will protect the health of our aquatic ecosystem, lower the amount of contaminants released to the river, and improve the water quality.
The CSST is also good for our drainage system. It will reduce the risk of basement flooding in the city’s core, and support our major sewer collectors by giving them a reliable backup and the flexibility that comes with all that extra storage space.
When will the CSST be built?
Construction has already begun! Sites have been prepared for the Tunnel Boring Machine (TBM), which is an underground factory capable of boring circular tunnels through solid rock at a pace of roughly 20 to 25 metres per day. The TBM – which is about 90 metres long and requires 8 to 10 operators down in the tunnel and many other support personnel at the surface – will start tunneling on the CSST project this summer. Work will continue through late summer 2019, and the CSST will be in operation in 2020.
For more information about the CSST project, please visit ottawa.ca/CSST.
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What is the CSST?
The CSST will consist of two massive inter-connected tunnels over six kilometres in total length and approximately three metres in diameter, located 10 to 31 metres below ground level.
The east-west tunnel will run under Slater and Cumberland Streets from LeBreton Flats to New Edinburgh Park, and the north-south tunnel will run below Kent Street from Chamberlain Avenue to just behind the Supreme Court. The project also includes support buildings, such as odour control facilities.
What will the CSST do?
The CSST will greatly reduce the frequency of sewage overflows during storms from entering the Ottawa River. During major rainfalls, such as the storms we experienced during the flooding in May, the tunnels will hold up to 43,000m3 of sewer overflow – that’s as much as approximately 18 Olympic-sized pools!
Once the rainfall subsides, the water held in the tunnel will be thoroughly treated at the Robert O. Pickard Environmental Centre to ensure it is safe for the public’s health and the environment before being returned to the river.
How will the CSST benefit Ottawa?
By keeping sewage overflow from entering the Ottawa River, the CSST will protect the health of our aquatic ecosystem, lower the amount of contaminants released to the river, and improve the water quality.
The CSST is also good for our drainage system. It will reduce the risk of basement flooding in the city’s core, and support our major sewer collectors by giving them a reliable backup and the flexibility that comes with all that extra storage space.
When will the CSST be built?
Construction has already begun! Sites have been prepared for the Tunnel Boring Machine (TBM), which is an underground factory capable of boring circular tunnels through solid rock at a pace of roughly 20 to 25 metres per day. The TBM – which is about 90 metres long and requires 8 to 10 operators down in the tunnel and many other support personnel at the surface – will start tunneling on the CSST project this summer. Work will continue through late summer 2019, and the CSST will be in operation in 2020.
For more information about the CSST project, please visit ottawa.ca/CSST.
查看原文...
