Building seepage for rainwater yourself - that's how it works

If you want to save on wastewater charges and make an ecological contribution, even rainwater seepage is a good idea. What options you have to build yourself a seepage, and what you need to look out for, learn here.

Preparatory planning

First, you need to determine if you are allowed to build a percolation at all. In water protection areas and source protection areas, infiltration systems are generally not permitted. This is also not allowed if there are proven contaminated sites on your property, or suspected contaminated sites exists. If in doubt, ask your local water authority.

Another exclusion reason would be too low infiltration capacity of the soil. Some soils (such as heavy clay soils) seep water very slowly and are therefore not suitable for the establishment of a seepage system. You can determine the rate of infiltration by measuring it yourself.

You should also be aware of the amount of groundwater level on your property (for example, a well builder in the area who has the appropriate maps available). The groundwater level must be at least 1 m below your infiltration facility.

After that, you still have to determine the area of ​​rain (for example roof area), and calculate how much rainwater (the so-called rainfall) falls on your rainy area. So you can estimate the accumulating amount of water.

So for starters, you need the following information:

  • Permissibility of the construction
  • Leakage performance of the soil
  • Height of the groundwater level
  • Size of the irrigated area from which the water is derived

construction methods

infiltration system

The simplest option is a percolation well - it is superficial and very easy to measure. As a rule, in the case of trough infiltrations, it is assumed that the trough should be around 10 to 20% of the size of the rainy area.

The higher the infiltration capacity of the soil, the smaller the trough can be. On average, it should empty itself within a day when the rain fills it.
If you have too little space, you can also build a Rigole - but that's a bit more time-consuming.

Tips & Tricks

You will find more information about trolls in this article. How to calculate rainwater infiltration read in this article.

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