印旛沼落堀考
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概要
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The lelics of Lake Imba drainage works the Edo era is found in the north-western part of the Chiba prefecture. The area in which the Lake lies is a part of the Kwanto Plain. The Lake being connected with the river Tone till 1922, all rain-water at the north-western Kwanto Plain flowed into the Lake. Consequently the Tone Basin had to suffer from frequent floods. Especially since its water-way to the Tokyo Bay was converted to Tyoshi, damage was rather seriously. So they took consideration to flow it away into the Tokyo Bay again, which was carried out as much as three times. The first and the second works were done to prevent damage by flood and to develop the new land. At the third works they planned to divide the water way (increase of the river mouth). This wes operated to get rid of the damage by flood, from which Edo had suffered as much as four times, and to give the water-way to the foodsupply route from the Ou District (Foodsupplying base of Edo). In those days the Feudal System of the Tokugawa Shogunate by centralization of power was being destroyed itself, so the drainage works was one of the most important policies for the Tokugawa Military Government.In short these three works ended in failure, because of political troubles and want of fund. But the process of the works were proceeded more than a half of the whole plan. Now (after 1948) to prevent damage by in water in the Lake, the works are under operation prevailing relics of the drainage works of Edo era.