As the rivers in the Sodai area were once shallow, and water could not be efficiently drawn from the main river, the local people suffered from annual droughts and low regional productivity. In spite of this, there were no large-scale irrigation systems in the area until the Sodaiyousui Irrigation System was constructed in 1669, and this was largely due to the administrative system at that time. The land in this region was divided up by several monarchs, and they were unable to work together to develop an irrigation system due to disagreements amongst themselves.
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