Easements are restrictions of one or other of the following rights (namely):—
Illustrations of the rights above referred to (a) The exclusive right of every owner of land in a town to build on such land, subject to any municipal law for the time being in force.
Explanation.—Land is in its natural condition when it is not excavated and not subjected to artificial pressure; and the "subjacent and adjacent soil " mentioned in this illustration means such soil only as in its natural condition would support the dominant heritage in its natural condition.
Explanation.—A natural stream is a stream, whether permanent or intermittent, tidal or tideless, on the surface of land or underground, which flows by the operation of nature only and in a natural and known course.