Al-tirazah
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Definition of "Al-tirazah"
Lit: A device made use of in a sluice that distributes water in definite standard units according to the common agreement of the owners and according to their rights. Tech: Al-tirazah was employed as a method in the assessment of al-misahah in the ‘Abbasid period (AD 750–945). It was a method of making an equitable assessment of land tax, keeping in view fertility of the soil, its facility for irrigation and the category of its crop.