Under which condition is a mound latrine typically used?

A mound latrine is specifically designed for situations where there is a high ground water level or rock formation. This design is advantageous because it elevates the waste above the ground level, preventing contamination of groundwater and improving sanitation in areas where soil is unable to absorb waste effectively. When ground water is high, or when the underlying soil is rocky, traditional digging for pits is impractical or impossible, making mound latrines an effective alternative.

In contrast, using a mound latrine is not appropriate in close proximity to water sources, as that would increase the risk of contaminating the water supply. Limited space for digging may lead to different sanitation solutions, such as portable toilets, rather than a mound design. Lastly, while inaccessible terrain might suggest different methods of waste management, mound latrines aren't specifically tailored for this condition unlike other solutions that can be employed. Thus, the high ground water level or rock formation is the primary condition that confirms the use of a mound latrine.