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Vraag 1 van 8

Gemiddeld

Which method of backflow prevention has the following advantages: Offers maximum backflow and flooding protection. Ideal for safeguarding electrical and other high value equipment. Offers unlimited use of sanitary facilities in case of backflow. Is easily serviced. Can be installed in a building’s storm water drains. Is not sensitive to sand and solid objects in the water.

Anti-flooding valves

Pumping stations

Lifting stations

Vraag 2 van 8

Gemiddeld

Which three factors have increased the risk of flooding and back flow?

A higher frequency of rainfalls, increased length of rainfalls and more paved areas today than earlier.

A higher frequency of rainfalls, unmaintained sewers and an increase in paved areas

A higher frequency of rainfalls and buildings that are poorly equipped for increased amounts of water.

Vraag 3 van 8

Gemiddeld

Which treatment is necessary for storm water?

It has to go through an oil/petrol separator

It has to go through a sand pressure

None – it is pumped directly to the recipient

Vraag 4 van 8

Gemiddeld

Who has the financial responsibility in the case of flooding in most countries?

The building owner and the building designers

The government and the wastewater authorities

The building designers and the contractors

Vraag 5 van 8

Gemiddeld

Of the three anti-flooding systems, why is the lifting station the superior system?

It is located outside the building which means bad odour is never a problem

The storage volume is high and it is easy to assemble and install

It is pre-assembled and its location inside the building makes it easily accessible for service. Furthermore, it offers maximum backflow and flooding protection

Vraag 6 van 8

Gemiddeld

Under which circumstances should you consider a pressurised wastewater system rather than a gravitation system

When there is a long distance between the building and the sewer main, when the sewer main is up-hill or when there are obstacles between the building and the sewer main.

When there is a long distance between the building and the sewer main or when the sewer main is located far below the building.

When there is a short distance between the building and the sewer main or there are obstacles between the building and sewer main.

Vraag 7 van 8

Gemiddeld

Which method of backflow prevention has the following advantages: Offers maximum backflow and flooding protection: Is not sensitive to fat, grease, sands and solids in the water. Makes it possible to use sanitary facilities in case of backflow. Offers protection for paved areas. Can be connected to buildings’ storm water drains.

Anti-flooding valves

Pumping stations

Lifting stations

Vraag 8 van 8

Gemiddeld

What are the disadvantages of the traditional gravitation system?

Many gravitation pipes with a small diameter have to be installed outside the building and the inspection wells are expensive

Inspection wells are difficult to maintain and the initial cost of the pumping pit is high

Many gravitation pipes have to be installed outside the building and a great deal of excavation work is needed.

Vraag 8 van 8

Gemiddeld

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1: Which method of backflow prevention has the following advantages: Offers maximum backflow and flooding protection. Ideal for safeguarding electrical and other high value equipment. Offers unlimited use of sanitary facilities in case of backflow. Is easily serviced. Can be installed in a building’s storm water drains. Is not sensitive to sand and solid objects in the water.

Anti-flooding valves