A Part of the northern defence
plan, were some major floodings north of Copenhagen.
From the Furesø Lake water was led
through the fortress-channel to the Northern and Southern Floodings.
Furthermore it was planned to enlarge a moor area (Kagsmosen)
All this was done with a complex system of dams and channels.
To explain the size and complexity of the flooding, 22,5 million cubic feet of
water would be led to
the southern flooding and 10,5 million cubic feet to the northern.