Look at the diagram labeled Separate system. How many different sewers run under the road in this system?

Which item is shown as a type of drainage system?

Which item is shown as a type of drainage system?

Which item is shown as a type of drainage system?

According to the list, pipes of size $$100\text{ mm}$$ should be laid to a fall of

According to the list, pipes of size $$150\text{ mm}$$ should be laid to a fall of

According to the list, pipes of size $$225\text{ mm}$$ should be laid to a fall of

The falls shown will give a velocity of approximately

In the picture and text, what tool is used to quickly create a fall for pipe work or drainage?

How many boning rods are used together to set the fall, as described?

What shape are the boning rods made into?

What material are the boning rods made from?

Who holds one boning rod at the other end of the trench, as described?

Testing drains: When the work is finished, what must any drain or private sewer be able to do during a test for water tightness?

Testing drains: From where to where should the water tightness test be carried out?

Testing drains: How should long branches be tested?

Testing drains: What should be installed close to the sewer to test the last length of drain, and sealed off before backfilling?

Water test: Which test is most widely used and generally considered the most reliable?

Water test: When rigid joints are used, how long should you wait before testing to let the cement/sand joints fully harden?

Water test: When can flexibly jointed pipes be tested?

Carrying out a water test: What is used to plug the lower end of the drain before filling from the upper end?

Carrying out a water test: What is the maximum head the lower end of the drain should be subject to at this stage?

Carrying out a water test: After the drain is filled, how long should it stand before topping up?

Carrying out a water test: Over what period is any leakage measured?

Carrying out a water test: What is the maximum leakage rate allowed for a 100 mm drain?

Carrying out a water test: What is the maximum leakage rate allowed for a 150 mm drain?

Carrying out an air test: When water is not readily available or its disposal is not convenient, which test is a good alternative?

Carrying out an air test: To what pressure is air pumped into the drain, as shown on a manometer?

Carrying out an air test: During a 5-minute period, the pressure should not fall from 100 mm to below what level?

Carrying out an air test: What instrument shows the pressure level during the air test?

Types of sub-soil drainage: Look at the diagram showing two layouts labeled Herringbone and Grid with arrows pointing to a water course. Which type has diagonal branch drains joining the main line?

Types of sub-soil drainage: In the diagram showing layouts labeled Herringbone and Grid with arrows pointing to a water course, which type has straight side branches joining the main line at right angles?