Table 4.

Estimates of Sanitation Containment Matrix for fecal sludge flow diagram.

Containment Type	Estimated Proportion of Population Using This Type	Estimated Proportion of This Type That Is Emptied
Septic tank with soak pit	8	10
Sealed tank with soak pit	12	10
Lined pit, open walls, and bottom but no overflow	11	10
Unlined pits, no overflow	15	10
Open defecation	5
Pit of all types, never emptied but abandoned and covered with soil no overflow	3
Septic tank connected to soak pit but with high groundwater risk	7	10
Sealed tank connected to soak pit but with high groundwater risk	11	10
Lined pit, open walls, and bottom but with high groundwater risk	11	10
Unlined pits with high groundwater risk	14	10
Pit of all types, never emptied but with high groundwater risk	3