Unlike concrete paving blocks or surfaces, ECCOgravel requires no minimum slope. Even with very heavy rainfall, the buffering capacity will be sufficient to handle the rainwater.

A quick calculation: the maximum 20-yearly rainfall in Belgium is 270 l/s/ha. For 10 minutes, this corresponds with 16.2 l/m².

The rainwater will immediately flow in between the hollow spaces of the gravel and the underlying foundations. This way, we reduce the risk of a reduction in functionality of the surfacing due to water remaining on the surface. A gravel layer of 5 cm may store up to 10 liters of water. It goes without saying that a minimal gravel foundation will take care of the rest.