8202 Cold water PT 3

Open Ended

What do you think could happen if mains cold water was not properly treated before distribution?

Multiple Choice

Why is the treatment and distribution of cold water important in plumbing systems?

• To ensure water is safe and clean for consumption

• To reduce water pressure in pipes

• To increase the temperature of water

• To prevent water from freezing

Multiple Choice

What is the main purpose of primary sedimentation in the water treatment process?

• To remove dissolved chemicals

• To allow solid impurities to settle

• To add chlorine to the water

• To filter water through sand

Open Ended

Explain how algae contribute to the purification of water in slow sand filtration.

Multiple Choice

Which layers are present in a typical slow sand filter, as shown in the diagram?

• Fine sand, gravel, clay puddle

• Fine sand, activated carbon, gravel

• Gravel, clay puddle, charcoal

• Fine sand, gravel, charcoal

Multiple Choice

In rapid sand filtration, what is the function of the back wash pipe?

• To introduce dirty water

• To remove accumulated impurities

• To add chemicals

• To drain clean water

Open Ended

Explain why no pumping is required in a gravity distribution system and discuss the advantages and limitations of this approach.

Multiple Choice

Compare the main differences between gravity distribution and pumped distribution systems for water supply.

• Gravity distribution uses natural elevation and does not require pumping, while pumped distribution uses pumps and water towers.

• Gravity distribution requires pumps and water towers, while pumped distribution relies solely on gravity.

• Both systems require pumps for initial water movement, but only gravity distribution uses water towers.

• Pumped distribution is only used for small-scale supply, while gravity distribution is for large-scale supply.

Multiple Choice

Which of the following is NOT a stage in the treatment of mains cold water?

• Sedimentation

• Filtration

• Sterilisation

• Distillation

Open Ended

Reflecting on what you have learned about the treatment methods of mains cold water, which stage do you think is most critical for ensuring water quality, and why?