Whoever owns the water does not own the river — he owns a stretch of time in it.
In Al-Ahsa, Najran and parts of Najd, water reached the fields through open channels and calculated courses. What is anthropologically striking is not the engineering but the division: how did people agree on who irrigates, and when?
Time as a unit of ownership
A farmer’s share was not a quantity of water but a quantity of time: known hours during which the water ran to his land. It was measured sometimes by the sun and sometimes by simple instruments, and it was inherited and sold as land is inherited.
That conception — ownership as time rather than as matter — overturns what we take to be obvious about property, and it is among the clearest illustrations that economy is culture before it is arithmetic.
Who enforced the system?
There was no central body watching. Enforcement was social: renown, reputation, custom, and the presence of the community. Whoever exceeded his share faced not a fine but a loss of standing — which is heavier.
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