Civil Code (Cap. 16), article 464

464. Where the easement is in respect of a flow of water issuing from a tenement belonging to others, or from a spring existing in such tenement, and consists in the right of preventing the dive rsion of the water, any visible and permanent works which the owner o f the dominant tenement may have made in the servient tenement in order to collect the water, or to facilitate its flow in his ow n tenement, shall be equivalent to the restraint mentioned in the last preceding article. Where emphyteuta, etc., suffers exercise of easement.