| 摘要 |
PURPOSE:To uniformly dry the soil for vegetation by ensuring the draining of even ground having bad draining efficiency by a method in which subtrenches are branched from the main trench of culvert type, and a water-collecting part is set in the sub-trenches connectedly to water collecting tubes in the main trench. CONSTITUTION:The main trench 2 is excavated from a high land to a low land by a trencher in the ground 1, and in the same way, subtrenches 3 are branched to form a housing trench 4 of a planar rib form. Vertical holes 5 are drilled in the crossing places between the main trench 2 and the subtrenches 3, and a water-collecting part 6 is inserted into the vertical holes 5. A perforated water- collecting tube 9 is set in the main trench 2 of the housing trench 4, and water- collecting tubes 10 as water-collecting parts are also set in the subtrenhes 3. Excessive water in the ground 1 is collected in the tubes 10 in the subtrenches 3 and also in the tubes 9 in the main trench 2 and then discharged from high land to low land. Water remaining on the surface of the soil 11 for vegetation is further collected in the water-collecting part 6 in the vertical holes 5 and drained. |
