Tha'labah heard his elders say that a man from the Quraysh had his share with Banu Qurayzah (in water). He brought the dispute to the Messenger of Allah ﷺ about al-Mahzur, a stream whose water they shared together. The Messenger of Allah ﷺ then decided that when water reached the ankles waters should not be held back to flow to the lower. (Using translation from Abū Dāʾūd 3638)
أَنَّ رَجُلًا مِنْ قُرَيْشٍ كَانَ لَهُ سَهْمٌ فِي بَنِي قُرَيْظَةَ فَخَاصَمَ إِلَى رَسُولِ اللهِ ﷺ فِي مَهْزُورِ السَّيْلِ الَّذِي يَقْتَسِمُونَ مَاءَهُ فَقَضَى بَيْنَهُمْ رَسُولُ اللهِ ﷺ إِنَّ الْمَاءَ إِلَى الْكَعْبَيْنِ لَا يَحْبِسُ الْأَعْلَى عَنِ الْأَسْفَلِ