Muwatta Imam Malik Book of Judgements, Hadith 28

Yahya related to me from Malik from Abdullah ibn Abi Bakr ibn Muhammad ibn Amr ibn Hazm that he heard that the Messenger of Allah ﷺ said about the flood-channels of Mahzur and Mudhaynib (in Madina), "Dam them systematically, so that the water is diverted into each property in turn up to ankle level, starting upstream."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ مُحَمَّدِ بْنِ عَمْرِو بْنِ حَزْمٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ فِي سَيْلِ مَهْزُورٍ وَمُذَيْنِبٍ " يُمْسَكُ حَتَّى الْكَعْبَيْنِ ثُمَّ يُرْسِلُ الأَعْلَى عَلَى الأَسْفَلِ " .