Design, Operation, and Maintenance of Controlled-Drainage/Subirrigation (CD-SI) Systems in Humid Areas

THE design, operation, and maintenance of controlled-drainage/subirrigation (CD-SI) systems are covered from the viewpoint of assisting the farmer, practicing engineer, contractor, and SCS personnel. A nomogram is presented for soils, permeability, approximate drain spacings, and ratio of CD-SI system spacing to drainage system spacings. Steps used in the design of a CD-SI system on a farm with sloping fields are covered in this report.