An irrigation dam near Sennar, completed in 1925, brought a much larger area in Al Jazirah under cultivation.
In 1926 Gwynne and the Mufti (the religious head of Moslems) stood together to bless the new Sennar Dam.
It was built in 1925 by the British engineer, desert explorer and adventurer, Stephen "Roy" Sherlock, under the direction of Weetman Pearson.
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