The design of the author's when angle? Group? If agricultural drainage air switch top Whole bokgae connecting pipe to crop multiple paper width parser watercourses in the length of furrows in multiples of corrosion bokgae to have the drain pipe top to the concrete drainage pipe equipment connected on for the home not uncovered this bokgae without crop water use have one of the air principle the wave of flowing surface wave in this do not come in handy on the water supply and demand support deseo which did not receive the air absorption of the ground is shorter wavelength or flowing water depths to get into the contamination with earth and sand, and a failure in the crops grown to flow the water to the bottom of the embankment surrounding the not be easy to add not overhaul connected to the drain head groove formula concrete drainage pipe portion even if the crack and breakage or drain embankment muneojimyeo collapsed or intrusion caused by tidal mud on the embankment around the crop To not be a new drainage pipe located not change is not made up of a connection and the connection to the water pipe head exploded tidy and warehousing recycling in the drain pipe seat was infringed and use or furrows way of concrete drainage pipe in crop growth and the absence Castle economic or sulcus way of concrete drainage pipe closing position when the own use of water security and reservoirs devised this to solve the insecurity problems in rivers and the plants inside the crop drainage on crop water supply connection on the top of the existing furrows way of concrete drainage pipe groove one to use if placed overwrite not uncovered the bokgae or bokgae slipped the bokgae digit bokgae is not a weakness crashing or furrows way of concrete drainage pipe connected to the head furrows way of concrete drainage pipe in agricultural water supply consisting of a connection do not add up to no the principle of a kind of air Flowing water wave waves good that we did not receive the air absorption As the wavelength is shorter come in handy on the water demand and supply support, or to enter a variety of pollutants and silt in the flowing waters not an obstacle to crop growth or furrows way of concrete drainage pipe part with cracks even if the damaged portion connected in the drain line head decompose easily be repaired, or it the bottom of the embankment surrounding the drain pipe does not infringe on the crop grown to tidal intrusion water flows not the embankment fall down or collapsed due to the muddy water in the embankment surrounding crops or furrow formula does not consist in a drainage pipe located was using a concrete drainage pipe in connection with access to the drainage pipe head in a new drainage pipe digit changes can not be decomposed tidy and warehousing recycling member St. economic and profitable economic or furrows way of concrete drainage pipe closing character Lee is good itself does not unsafe.