Test your knowledge

Question 1 of 8

Intermediate

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

Question 2 of 8

Intermediate

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.

Question 3 of 8

Intermediate

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

Question 4 of 8

Intermediate

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.

Question 5 of 8

Intermediate

Why is the life cycle cost of the pressurised wastewater system low?

There are only a few gravitation pipes outside the building and the excavation cost is low

The initial cost of the lifting station is lower compared with a pit and there are no gravitation pipes outside the building

The lifting station and the pipe system is maintenance-free

Question 6 of 8

Intermediate

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.

Question 7 of 8

Intermediate

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

Question 8 of 8

Intermediate

What are the four most common types of wastewater from commercial buildings?

Wastewater, storm water, drainage water and wastewater from parking areas

Rainwater, wastewater, storm water and drainage water

Wastewater, storm water, air-conditioning wastewater and wastewater from parking areas

Question 8 of 8

Intermediate

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1: 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

2: 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

2: What are the disadvantages of the traditional gravitation system?

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

2: What are the disadvantages of the traditional gravitation system?

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

3: 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

4: 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.

4: 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 or when the sewer main is located far below the building.

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

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

5: Why is the life cycle cost of the pressurised wastewater system low?

There are only a few gravitation pipes outside the building and the excavation cost is low

5: Why is the life cycle cost of the pressurised wastewater system low?

The initial cost of the lifting station is lower compared with a pit and there are no gravitation pipes outside the building

5: Why is the life cycle cost of the pressurised wastewater system low?

The lifting station and the pipe system is maintenance-free

6: 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.

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

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

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

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

7: 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

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

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

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

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

8: What are the four most common types of wastewater from commercial buildings?

Wastewater, storm water, drainage water and wastewater from parking areas

8: What are the four most common types of wastewater from commercial buildings?

Rainwater, wastewater, storm water and drainage water

8: What are the four most common types of wastewater from commercial buildings?

Wastewater, storm water, air-conditioning wastewater and wastewater from parking areas