灰土暗渠是地下暗渠的一种。它具有节约土地、节省水量、便于机耕、有利交通等许多优点,比明渠一般可减少渠占地3—5%,节省水量20—30%。除此以外,灰土暗渠的独特优点:一是可就地取材,造价较低。所用材料为石灰和普通粘土,造价只需水泥暗管渠的三分之一左右。二是施工简单,便于大搞。一般采用现场夯筑的办法,可以结合农田基本建设,大搞群众运动。 Lime culverts are a type of underground culvert. It has the advantages of saving land, saving water, facilitating tillage, and facilitating traffic. It can reduce the canal area by 3-5% and save 20-30% of the canal water. In addition, the unique advantages of limestone underdrain: First, local availability, lower cost. Materials used for the lime and ordinary clay, cost only about one-third of the cement pipe. Second, the construction is simple, easy to engage in. Generally use the site ramming approach, can be combined with farmland infrastructure, vigorously promote the mass movement.