Abstract
Construction of the Hyakken River, a diversion channel for the Asahi River, was carried out at the initial stage of the Edo period. Main structures such as weirs and gates were made of stone and skillful masonry technique was used. The construction works were carried under the direction of Eichu Tsuda who was the county reign of the Okayama province and he proposed many new ideas. The flood prevention system by the diversion channel and river mouth gate has fulfilled its function more than three hundred years. The advanced civil engineering technology used in the construction works is introduced in this study. It is necessary that we once reexamine the disaster prevention technology which the predecessor left for us now.
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