Classical Islamic jurisprudence developed a detailed body of water law that treated water as a shared good while recognising rights of priority, allocation and sale derived from the prophetic principle that people share in water, pasture and fire. The law set rules for the right of thirst, the irrigation turn, the protective harim zone reserved around wells and channels, and the division of flow between users. Applied to the qanat, the gravity-fed underground aqueduct of the arid world, it governed the apportionment of scarce water among shareholders and the duties of maintenance. Specialised officials and customary courts administered these rights through measured time-shares and registers.
Islamic water law provided a sophisticated legal framework for sharing and protecting scarce water, the resource on which settlement in the arid belt depended. By codifying allocation, easements and the harim buffer, it shaped the institutions that sustained irrigated agriculture and urban water supply across the Muslim world.
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