To prevent water from entering the pipe

To prevent soil from getting into the pipe

To increase water flow into the pipe

To protect the pipe from damage

When retaining earth and enclosing habitable spaces below grade

When the soil is not well-drained

Only in areas prone to heavy rains

Always

To prevent the buildup of hydrostatic pressure next to the wall

To increase the pressure next to the wall

To prevent water from draining to the perimeter drain

To block the flow of water to the drain

Flexible corrugated plastic pipe

Metal pipes

Rigid drain tile or perforated pipe

Wooden pipes

Type of soil placed

Distance of trees from the foundation

Placement of drain pipes

Moisture content of the air

Twice their eventual height

No closer than their eventual height

At least 20 feet away

At least 10 feet away

To collect water leaked through the top of the footing into the basement

To prevent soil erosion

To prevent water accumulation near the foundation

To drain water quickly to the perimeter drain

To reduce the risk of settlement

To drain water quickly to the perimeter drain

To prevent water accumulation near the foundation

To collect water leaked through the top of the footing into the basement

Increases soil erosion

Encourages breeding of mosquitoes

Reduces the risk of settlement

Contaminates water bodies

box culvert

drain sump

manhole

strip foundation

2.30m

1.80m

0.5m

4.10m