By the 1950s only a small proportion of Upper Egypt had not been converted from basin (low transmission) to perennial (high transmission) irrigation.
Daɣ wityan wi 1950, iyandaɣ edag adiran ən Haute-Egypte wareqel atwasamalayan səswitan wən bassin (hən ilanen ihuk) had asəsu aśohen (ihakan śaśhat).