A heap is a longish hole dug in the ground in which manure, other organic fertilizers or compost that needs ripening is placed to wait for later application in the field. An advance notification on the heap must be given to the municipal environmental protection authorities.
Manure heaps are forbidden in groundwater areas and areas that are at risk of flooding. The heap must be placed on firm ground in a field and if the field slopes, the heap must be placed is high as possible. The heap must be placed at least 100 meters from any water body, main ditch or well used for household water and at least five metres from any ditch.
A 20-centimetre layer of material that absorbs liquid must be spread at the bottom of the heap and the heap must be provided with an impermeable cover. Any snow must be removed from the area before digging the hole for the heap.
The material stored in the heap must be applied within twelve months. A new heap may not be placed to the same location until two years later.