Groundwater pipe package

A package of parts for a groundwater pipe package

A new requirement is that the property owner or supervisory authority must be able to check that the individual sewage plant’s infiltration bed or soil bed is not in the groundwater, the plant must have a so-called groundwater pipe.

Included in the package.
2 Black 110 mm pipes 1 m.
1 Drainage pipe 110mm 1m.
3 Drainage sleeves.
1 Cleaning cap with support.
1 Geotextile N1 2×2 meters.

Instructions for groundwater pipes
The diameter of the pipe should be at least 110 mm (a “normal sewer pipe” can be used). Narrower pipes make it difficult to get access to measure with a plumb bob or ruler and it is difficult to see (even with a flashlight) if the pipe is narrow and deep.

If the groundwater pipe is installed as a control point for monitoring performance, the bottom of the pipe should be at least 140 cm below the infiltration level.

If the groundwater pipe is also to be used for determining the depth to the groundwater level in connection with the design of the plant, the bottom of the pipe should be at least 2.5 m below the ground surface.

The pipe should be accessible and marked all year round and fitted with a lid.

The filter part of the pipe (bottom part) should be about 50 cm, surrounded by washed macadam, coarse gravel or shingle and perforated (drainage pipe),

The pipe does not need to be sealed (as the purpose of the pipe is not groundwater quality sampling), but a geotextile should be placed on top of the macadam/gravel surrounding the filter section before backfilling.

The pipe should be installed within 2-3 meters of the installation.
On a slope, the groundwater level is closer to the spreading pipe in the upstream part of the installation. There, the distribution pipeline is also deeper in the ground, which increases the risk of having the rock too close to the distribution pipeline in this area, for example. Therefore, the groundwater pipe should preferably be placed upstream of the infiltration on slopes, see figure below. If the terrain is relatively flat, this is less important.