Although not always possible to achieve, an ideal raft density would be one raft per km of river; research shows that this allows each mink access to at least one raft, but usually two or three. For open water, such as the broads or fishing lakes you can follow the same spacing along the water’s edge. For land with many ditches or channels, i.e. marshland, it is suggested to have one raft per square km as a starting point, more maybe necessary depending on the density of the ditches. When mink are scarce, rafts can be deployed at a lower density to look out for their return.