It is narrated from Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) gave judgement concerning the watering channel (of date palms): "The higher one comes before the lower one, and the water is held in it up to the ankles; then the water is sent on to the lower one next to it." In the same way the gardens are watered.
Ishaq bin Yahya bin Ubadah's narration (from Ubadah) is mursal.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب إحياء الموات / 11859