GMJ 9189 Phase 2 Below ground drainage systems

Which underground drainage system is this?

• Separate

• Combined

• Partial

• Partially combined

Which underground drainage system is this?

• Separate

• Combined

• Partial

• Partially combined

Which underground drainage system is this?

• Separate

• Combined

• Partial

• Partially combined

What are also used with partial system to collect water from a roof not connected to the surface water drain.

• Cast iron down pipes

• Soakaways

• An extra inspection hatch

• A roof with a shallow pitch

A soakaway is a pit – usually ........ 1m x 1m x 1m, dug into the ground and filled with gravel – where the rainwater pipe discharges into.

• 2m x 2m x 2m, dug into the ground and filled with gravel – where the rainwater pipe discharges into.

• 1m x 1m x 1m, dug into the ground and filled with gravel – where the rainwater pipe discharges into.

• Soakaways should be situated at least 5m away from the property.

• Soakaways should be situated at least 12m away from the property.

Waste pipes up to what diameter for appliances such as kitchen sinks, cleaners’ sinks and washbasins may discharge directly into the back-inlet gully of a below-ground drainage system.

• 32mm

• 40mm

• 50mm

• 75mm

A waste pipe discharging into a ground level gully should do which of the following?

• Discharge over the grate

• Discharge through the grate but above the water level of the trap seal

• Discharge adjacent to the grate

• Discharge through the grate and below the water level of the trap seal

A waste pipe discharging into a ground level gully through the grate but above the water level of the trap seal to ?

• Maintain an aesthetic look

• This ensures that an air break is maintained and that no smells can enter the building.

• To avoid the wastepipe getting blocked with snow/or leaves etc

• Provide an extra trap seal

Pan connectors are available in a number of lengths and outlet sizes to suit most drainage systems, and to fit both modern and existing WC pans.

• 75-110mm

• 50-100mm

• 32-110mm

• 50-75mm

Septic tanks may be installed, subject to consent, in applications where:

• installation complies with Building Regulations (Approved Document L1a)

• installation complies with Building Regulations (Approved Document H)

• installation complies with Building Regulations (Approved Document G)

• installation complies with Building Regulations (Approved Document J)