| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a house and an agricultural field from being inundated and damaged due to a washout of a dike and an overflow when water in a river rises up to a prescribed level by discharging water above the prescribed level into a permeable layer in the ground outside the dike. <P>SOLUTION: Dikes 2 and 2 of a river 1 are provided with channels 3 which discharge water in the river, when the water exceeds a level of a prescribed range, from a river inside the dikes into permeable layers in the grounds outside the dikes. When the water level in the river rises and exceeds the prescribed range, the channels allow the water to be discharged into permeable layers 5 in the grounds outside the dikes. <P>COPYRIGHT: (C)2012,JPO&INPIT |
