permeable pavement

Good morning,

our driveway is about 10 x 5 meters in size. According to the development plan, we have to use a permeable pavement, such as drainage or eco-paving.

We have now been advised to slightly slope the entire area and to add a channel drain at one corner.

Is something like this even necessary with drainage paving? I have never consciously seen it and cannot imagine it.

Best regards
Katrin

So we laid permeable paving. And with the paving, we formed a kind of channel. So we laid 2 rows near the curb slightly wedge-shaped. In hindsight, I have to say that was not necessary. Even during very heavy rain, no water collects anywhere that then flows into the channel. Water hits it and then infiltrates. With normal paving like the neighbors have, you can see a film of water and sometimes water running in channels. But that also depends on the slope. And what the regulations say. We have a slight slope towards the street.

Now in winter, snow stays longer with us or even when it’s wet, it stays wet longer than with normal paving. But it is also almost completely in the shade for us. Salt is not allowed in winter on permeable paving. And we will see how it is after a few years when dust etc. may have possibly reduced the permeability.

Hm we have it just like World - a row of stones lower towards the drain - and I've never consciously seen water run towards the gutter. However, I rarely stand outside during heavy rain. It seeps away anyway, our driveway dries significantly faster, but now over the damp winter the stones turn green - which doesn't bother us, as soon as the sun shines on them again, it's over anyway.

Take a look at the development plan/building permit to see exactly what it says...

In our case, it states "Infiltration must occur on the property" and further "The structure must not be airtight or watertight," which many neighbors interpreted as "permeable pavement," but that is WRONG.

So, first look carefully, then continue planning.

Either way: the advice is correct regardless of the choice of pavement; in the event of heavy rain, you are liable for any damage caused by water illegally diverted onto the street.

The development plan states:

"All surface water must be fed into the surface water canal or the retention facilities, insofar as it is not collected in rainwater storage tanks and used on the property."

And that pavements for open spaces must be permeable.

So there remains a residue of surface water during heavy rain that does not infiltrate immediately?

That should be the normal case ... the water can't infiltrate that quickly ...