Easements acquired under section 15 are said to be acquired by prescription, and are called prescriptive rights.
None of the following rights can be so acquired:—
(a)a right which would tend to the total destruction of the subject of the right, or the property on which, if the acquisition were made, liability would be imposed;
(b)a right to the free passage of light or air to an open space of ground;
(c)a right to surface-water not flowing in a stream and not permanently collected in a pool, tank or otherwise;
(d)a right to underground water not passing in a defined channel.