In rural areas, the Ventilated Improved Pit Latrine (VIP) is often considered as the basic standard for sanitation. Large numbers of VIPs have even been constructed in urban areas where other sanitation options were not economically feasible. Pit filling times vary widely depending on factors such as numbers of users, soil type and pit lining methodology. Pits are also generally used for solid waste disposal, and this hastens the filling time.
STILL, D.A. (2002): After the Pit Latrine is Full. What Then? Effective Options for Pit Latrine Management. Pretoria: Water Research Commission URL [Accessed: 09.12.2010]