It grows in marshes, ditches, pools and drains in meadows, and sometimes obstructs the flow of water with its dense matted roots.
A large sand bar obstructs the entrance to the river, which is not quite 1 m.
The river bar obstructs navigation, the depth not exceeding 14 ft., so that large vessels must lie outside.
They pass more readily through mucous membranes, but almost every one of these is provided not only with a coating of mucus, which obstructs their passage, but with some reflex mechanism which tends to remove them.
The current fencing obstructs the public footpath -- there is a gate to one side but no stile over the fence the other side.