Civil Code (Cap. 16), article 405

405. (1) The owner of the higher tenement may cause the water which runs through the public road to be led into his own tenement, in preference to the o wner of the lower tenement. (2) In the case of owners of tenements placed on the same level, each of such owners may cause the water which runs on th at half of the road, which is contiguous to his tenement, to be le d into such tenement. Where water is required for the use of man, etc.