268. Percolation caused by working mines.

The occupier of a mine1 is entitled to get all the minerals2 in his mine in a skilful and usual course of working3, and legitimate operations conducted for that purpose do not impose a liability upon the owner of mines lying at a higher level, if the result4 is to permit the escape of water which collects in the workings, or even if the natural flow is increased. Thus the removal of a stratum which results in the inundation of a lower mine by an accumulation of water above the stratum5, or the construction between two parallel inclined seams