Below-Ground Drainage (Leaving Cert Construction Studies): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What problem does siphonage cause in drainage systems?
What problem does siphonage cause in drainage systems?
Empties water traps, allowing sewer gases in
How does self-siphonage create suction in drainage systems?
How does self-siphonage create suction in drainage systems?
Flowing water reduces pressure in pipe
Where does back pressure typically develop in a drainage stack?
Where does back pressure typically develop in a drainage stack?
At bottom where stack changes direction
At what drain depth must manholes be used instead of inspection chambers?
At what drain depth must manholes be used instead of inspection chambers?
Exceeding 1 metre
What is the maximum depth for installing inspection chambers?
What is the maximum depth for installing inspection chambers?
Up to 1 metre
What is the standard minimum pipe diameter for below-ground drainage?
What is the standard minimum pipe diameter for below-ground drainage?
100mm
When must underground drainage systems be tested?
When must underground drainage systems be tested?
Before backfilling
How long must pressure be maintained during an air test of drainage pipes?
How long must pressure be maintained during an air test of drainage pipes?
3 minutes
How long must water level be maintained during a water test of drainage?
How long must water level be maintained during a water test of drainage?
24 hours
At what branch length must ventilation be installed in drainage systems?
At what branch length must ventilation be installed in drainage systems?
Exceeding 6 metres