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METHOD OF CONTROLLING FIELD UNDERGROUND WATER LEVEL

Patent code P04A005009
Posted date Dec 7, 2004
Application number P2000-109324
Publication number P2001-295252A
Patent number P3424006
Date of filing Apr 11, 2000
Date of publication of application Oct 26, 2001
Date of registration May 2, 2003
Inventor
  • (In Japanese)中山 煕之
Applicant
  • (In Japanese)独立行政法人農業・食品産業技術総合研究機構
Title METHOD OF CONTROLLING FIELD UNDERGROUND WATER LEVEL
Abstract

PROBLEM TO BE SOLVED: To provide a method of controlling the underground water level of a field for cultivating the crops, to the predetermined water level so as to be horizontal over the whole field.

SOLUTION: The underground of a boundary part of the field 1 is surrounded by a water-barrier curtain 2 made of soft synthetic resin, vertically to the ground along a ridge 8, and the tip part of a culvert near a drainage canal 6 is provided with a drainage water level regulating gate 5 to control the underground water level of the field 1. The underground water level in the field 1 is maintained to the water level set by a covering cylinder 9 of the water level regulating gate 5, by a combination of the water-barrier curtain 2 and water level regulating gate 5. Moreover, the water level of the whole field 1 is maintained to be horizontal. In the case of draining from an upper overflow port 7 by lowering a drainage cylinder 8 of the water level regulating gate 5 to close a side cock, the supply of air to marl from a drainage hole 11 through the culvert is avoided. Since the underground water level on the drainage canal 6 side is not lowered, there is no supply of excessive air from the upper side, and air supply from the underground through the culvert is cut off, so that the decomposition of the marl on the drainage canal 6 side does not particularly advance, nor does the ground above subside to cause the inclination of a field surface.

Outline of related art and contending technology (In Japanese)圃場に暗渠排水管を一定間隔・一定深度に埋設し、暗渠管の先端部位に設けた水甲(止水栓)の開閉によって排水及び湛水(水田の場合)の切り替えを行っていた。
Field of industrial application (In Japanese)農作物を栽培する圃場の地下水位を、予め設定した水位に、かつ圃場全体にわたって水平になるように制御する圃場地下水位制御法
Scope of claims (In Japanese)
【請求項1】
  圃場(1)の境界部の地下に、畦畔(3)に沿って地面に垂直に軟質合成樹脂製の遮水幕(3)を巡らせ、排水路(6)近傍の暗渠管(4)の先端部位に、上下に複数個の溢水口(7)を配置し、地上に突出する排水円筒操作棒(8a)により上下調節可能で、かつ下端が暗渠管(4)の横栓を兼ねている排水円筒(8)と、この排水円筒(8)に沿って地上に突出する被覆円筒操作棒(9a)により上下調節可能の溢水口被覆円筒(9)とで構成された排出水位調節水甲(5)を設けて、圃場(1)の地下水位を制御するようにしたことを特徴とする圃場地下水位制御法。
Industrial division
  • Earthwork
  • High polymer
IPC(International Patent Classification)
Drawing

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State of application right Right is in force


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