'Amr bin Shu'aib on his father's authority said that his grandfather told that the Messenger of Allah ﷺ decided regarding the stream al-Mahzur that its water should be held back till it reached the ankles, and that the upper waters should then be allowed to flow to the lower.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَضَى فِي السَّيْلِ الْمَهْزُورِ أَنْ يُمْسَكَ حَتَّى يَبْلُغَ الْكَعْبَيْنِ ثُمَّ يُرْسِلُ الأَعْلَى عَلَى الأَسْفَلِ  

the Messenger of Allah ﷺ ruled concerning the stream of Mahzur that the water should be retained until it reached the ankles, then released.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَضَى فِي سَيْلِ مَهْزُورٍ أَنْ يُمْسِكَ حَتَّى يَبْلُغَ الْكَعْبَيْنِ ثُمَّ يُرْسِلَ الْمَاءَ  

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."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ فِي سَيْلِ مَهْزُورٍ وَمُذَيْنِبٍ يُمْسَكُ حَتَّى الْكَعْبَيْنِ ثُمَّ يُرْسِلُ الأَعْلَى عَلَى الأَسْفَلِ  

'Amr bin Shu'aib on his father's authority said that his grandfather told that the Messenger of Allah ﷺ decided regarding the stream al-Mahzur that its water should be held back till it reached the ankles, and that the upper waters should then be allowed to flow to the lower. (Using translation from Abū Dāʾūd 3639)   

أَنَّ رَسُولَ اللهِ ﷺ قَضَى فِي السَّيْلِ الْمَهْزُورِ أَنْ يُمْسَكَ حَتَّى يَبْلُغَ إِلَى الْكَعْبَيْنِ ثُمَّ يُرْسِلُ الْأَعْلَى عَلَى الْأَسْفَلِ