As requested, a number of experts were consulted for their opinion where there was a lack of project evaluations or grey literature. Case study information was collated from African, Middle Eastern, South Asian and Caribbean countries. What innovative WASH options exist for situations of severe population overcrowding and limited space? What lessons have been learned from their application?Ī rapid review of the literature has found a selection of innovative WASH options available for situations of severe population overcrowding and limited spaces.
