Control technique and system for run-off sand from agricultural land

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The soil erosion becomes an environment problem with the earth scale with making a desert at present. Especially, the explosive increase of the population becomes pressure at the developing nation and the result of the forest felling, the agricultural land development causes ground erosion and the ground outflow becomes a big problem. Soil and sand outflow is taken up as the environment problem in addition to the agricultural land disaster.Therefore, it grasps the actual state of the soil and sand outflow from the agricultural land and to establish the restraint control system has very important meaning.In this study, it examined each measure to exclude bed load and floating sand in the fault grain part, it came out on the pollution watercourse and it made restraint a system.It implemented the following study in the given period. (1) Technical limit of the method of construction in the past to the floating sand which becomes the factor of muddy water. (2) The plan and the design of the permeable settling basin method of construction which is based on the spot investigation in the domestic related area. (3) The water reason design for the examination building and the preparation of the spot building and the investigation. (4) The examination of the purge function of under-drainage and the sandy filtration layer. (5) The physical characteristic and the sinking characteristic experiment of the topsoil in the examination field. (6) The promotion operation of the glavitational sinking of settling basin by under-drainage. (7) The material experiment of the under-drainage filtration layer. (8) The under-drainage ability decline and the measure examination of it. It made a manual about the soil and sand outflow control method of construction from above results.