Protected zone D – Regional flood defences (standard 1:100) (Organisation Regulation)

This stock contains protected area D (regional flood defences, standard 1:100), as established in the Environmental Ordinance of the Province of Groningen. These are regional flood defences in the province of Groningen. They are tested and strengthened on the level of water once every 100 years (1:100). For stability, they meet a load once every 100 years. This area D is part of the Frisian Boezem and associated high water levels.