Vertical infiltration

A vertical infiltration system is an ideal measure for collecting rainwater and allowing it to sink into the ground if:

  • there is little space in your garden;
  • there is space for an excavator;
  • the soil is very well-drained;
  • the groundwater level is deep.

Vertical infiltration consists of a metre infiltration pipe with small holes. Around it is an infiltration cloth and infiltration or lava sand. Rainwater flows through a sand and dirt trap to this infiltration pipe, after which it can sink into the ground.

Costs

The costs are low, especially when compared to other underground systems.

Use of space

The space required is very small. You need approximately twice the area of a 50 cm diameter.

Difficulty

Installing a vertical infiltration system is easy. To drill a hole, you will need a machine with the appropriate drill bit. It is best to have this done by a professional. You can install the other components yourself.

Earthmoving

The installation of the vertical infiltration pipe does not require much groundwork. However, you will need to dig in the sand and dirt trap and connect the rainwater pipes to your system.

Maintenance

Not much maintenance is required. Occasionally, you will need to empty the sand and dirt trap.

Climate goals

Natural replenishment of groundwater.

Biodiversity

Contribution to improving biodiversity

Points of attention

  • If the top layer of soil consists mainly of clay and loam, this measure is not effective. The water cannot sink quickly into the soil.
  • In older homes, the downspout often also serves as the vent for the sewage system. If you disconnect this downspout, you will need to restore the vent.
  • An infiltration pipe does not have much storage capacity. This does not have to be a problem if the soil is well-drained and the groundwater level is deep.
  • During extreme thunderstorms, the infiltration system can sometimes suddenly become full. Ensure that excess water can drain away to the garden or the street, for example.
  • Stay approximately 3 metre away metre the foundation and trees. 
  • Deep infiltrations are not permitted in groundwater protection areas.