A pit is dug to a depth of four to six feet and large enough to take care of wastes for several years about 50 cubic
feet for a family. A floor cover at the top of the pit is
provided together with a riser, seat, and self-closing lid, all made as fly tight as possible. Vents may be provided but they should be made insect-proof by placing a screen over or along the vent. The pit should be cased on the sides to prevent the entry of surface water. Bamboo, wood, brick, hollow blocks, and empty drums may be used to case the pit.