 Burman immigrants are believed to have either introduced new water management techniques or greatly enhanced existing Pyu system of weirs, dams, sluices, and diversionary barricades.At any rate, the Kyaukse agricultural basin's development in the 10th and 11th centuries enabled the kingdom of Pagan to expand beyond the dry zone of Upper Burma, and to dominate its periphery, including the maritime Lower Burma.As reconstructed by Michael Aung-Thwin, G.H.