Falaj Al-Qaswat in the Wilayat of Izki: A Testament to Omani Ingenuity in Water Resource Management

Falaj al-Qaswat is one of the most distinctive cultural heritage landmarks in the Wilayat of Izki, Ad Dakhiliyah Governorate, representing a unique model of the sustainability of traditional water systems in the Sultanate of Oman. This falaj belongs to the ‘Addi type, which relies on the natural flow of water from deep groundwater reservoirs without the use of pumps. It extends for approximately 6.4 kilometers between the villages of Siddi and Harat al- Raha. Historical sources document its origin more than a thousand years ago; it is mentioned in Bayan al-Shar’ by Shaykh Mohammed ibn Ibrahim al-Kindi (5th century AH), and is also referenced in a rare manuscript written in the hand of Imam Nasir bin Murshid al-Ya‘rubi (17th century), conferring upon it well-documented historical significance within Oman’s water heritage. The engineering of the falaj is characterized by the precision of excavation and lining to ensure continuous flow. Its water salinity measures approximately 182 parts per million at a pH of 8.7, with an average discharge of about 17 liters per second. The irrigation system is managed through a precise traditional method known as al-Muhadara, which is based on dividing time into units called al-Athar, currently regulated using modern hours. The study aimed to document its hydrological, architectural, and social characteristics. It included an exploration of the falaj’s source Umm al-Falaj, its main channel Shari‘at al-Falaj, and the farms it irrigates, in addition to examining the Gharraq Falah system and analyzing traditional water distribution methods. The study concluded that Falaj al- Qaswat enjoys remarkable hydrological stability and that its efficiency in water distribution remains high due to regular maintenance and inherited traditional management. Findings demonstrated that the falaj plays an effective role in supporting sustainable agriculture and biodiversity. Recommendations include continued documentation of traditional knowledge, strengthening preventive maintenance programs using materials compatible with the original structural fabric, and scientific research to assess the impact of climate change on water resources.

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