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In the Saga plains many facilities were built for flood control in the Edo era. It is very useful for future flood control technology to clarify those functions. In this study, the forest for flood damage protection and the auxiliary levee are focused. They are located in the midstream of Kase River and considered as a historic facility for flood control. At first the study grasps those present conditions and clarifies those functions by a 2-D depth-averaged numerical analysis on curvilinear coordinate systems successively. As a result, luxuriant growth areas of the forest increase year by year, and, as a result, water level becomes high at the time of flood in comparison with the past. The water level rise by the forest for flood damage protection has an influence upstream. Therefore, water level is high and speed is small upstream. Because flows gather in low-flow channel by the forest for flood damage protection, low-flow channel is fixed.

PRESENT CONDITIONS OF THE FOREST FOR FLOOD DAMAGE PROTECTION AND THE AUXILIARY LEVEE IN THE MIDSTREAM OF KASE RIVER AND INFLUENCE ON FLOOD FLOWS