Sayyidah Aishah (may Allah be pleased with her) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "No one should withhold the surplus water of a well; it is shared by all." Abd al-Rahman says: I heard my father say that al-rahw is when a well is shared (by partners) in its water; so if a man has surplus water, he should not withhold it from his partner.
Harithah bin Muhammad also narrated it from Amrah as connected, except that Harithah is da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب إحياء الموات / 11849