| Shit flow diagram | |
|---|---|
| Synonym | Excreta flow diagram, SFD |
 | |
| An example shit flow diagram | |
| Position in sanitation chain | Planning |
| Application level | City |
| Environmental concerns | Water pollution, environmental health, public health, sewage sludge disposal issues |
A shit flow diagram (also called excreta flow diagram or SFD) is a high level technical drawing used to display how excreta moves through a location, and functions as a tool to identify where improvements are needed.[1] The diagram has a particular focus on treatment of the waste, and its final disposal or use. SFDs are most often used in developing countries.