The Messenger of Allah ﷺ as saying A tenth is payable on what is watered by rivers and brooks or from underground moisture and a twentieth on what is watered by draught camels.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ فِيمَا سَقَتِ الأَنْهَارُ وَالْعُيُونُ الْعُشْرُ وَمَا سُقِيَ بِالسَّوَانِي فَفِيهِ نِصْفُ الْعُشْرِ