排水沟的作用是减少淹水深度和淹水时间，以保证作物正常生长。因此它是农田水利治理工程的重要措施。在三江平原低温沼泽地防洪治涝工程中，治涝位于农田治理和农业开发过程的首位，排水沟开挖工程量和投资量占工程总投资的比重很大，所以，必须要把排水沟设计和施工好，使其 The function of drains is to reduce the depth of flooding and flooding time to ensure the normal growth of crops. Therefore, it is an important measure of farmland water conservancy project. In the low-temperature marshland flood control and waterlogging project in the Sanjiang Plain, waterlogging control is the first place in farmland management and agricultural development. The amount of drainage ditch excavation and the amount of investment account for a large proportion of the total investment in the project. Therefore, it is necessary to design the drainage ditch And well constructed to make it