FISHY HOLLOW PLACE BY WOODWORKING MATTRESS

摘要

PURPOSE: To arrange woodworking mattresses in the horizontal direction as a substitute of a checkdam of a river or a ground sill, to form a fishy hollow place in the rear of the woodworking mattresses and to enable fish to reach the upper part of the river across a weir. ;CONSTITUTION: Wooden levers 4 are mounted on two opposite sides around the upper surface of the concrete foundation 1, and then, wooden levers 4 opposed to the remaining two sides are intersected with the wooden levers 4 mentioned above to overlap, subsequently, they are piled up in the same way, and a reinforcing bar 3 erected on the upper surface of the concrete foundation 1 is inserted in the intersected part of the wooden levers 4 and is fixed to form wooden leverframes 6. One end of an inclined plate body 7 is fixed downward of the inside near to one side, and the other end is so fixed that it is projected from the upper surface of the approximate center of the wooden lever frames 6 and is arranged to the bottom floor of the river.;COPYRIGHT: (C)1994,JPO&Japio