Malik related to me from Abu'z-Zinad from al-Araj from AbuHurayra that the Messenger of Allah, may Allah bless him and grant himpeace, said, "Excess water is not withheld in order to prevent herbagefrom growing."
USC-MSA web (English) reference: Book 36, Hadith 29
Arabic reference: Book 36, Hadith 1433