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暗滤沟又叫煤渣沟,我们大队农科队在1975年冬季开始试验,面积1.8亩。暗滤沟宽12厘米,深60厘米,在沟底部还填煤渣25厘米深,上部还土35厘米,沟距3.5米,沟一端离灌渠2米不掘通,以便保水,另一端接通用砖头砌成的三角形暗沟,再由三角暗沟接通排水总沟,在出口处筑一个小节制闸,以便在需水和排水时节制用。这种暗沟每亩化劳力3工,化煤碴5吨,用砖200块,化钱6元。经一年后检查情况良好,排出清水,沟壁不变形,煤碴
Dark filter ditch is also called cinder ditch, our brigade agricultural team started the trial in the winter of 1975, an area of 1.8 acres. The dark filter ditch is 12 cm deep and 60 cm deep. At the bottom of the ditch, the cinder is also filled with 25 cm deep cinder and the upper part is also covered with 35 cm. The ditch is 3.5 m. One end of the ditch is 2 m away from the irrigation ditch for water retention and the other end is connected to the bricks Triangle built under the ditch, and then by the triangular ditch connected to the total drainage ditch, at the exit to build a barricade gate, in order to control water and drainage control. This underground ditch 3 acres of labor per labor, 5 tons of coal ballast, brick 200, the money 6 yuan. After a year of inspection in good condition, the water is discharged, the ditch is not deformed, coal ballast