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In addtiion to the good technical advice above, key questions would be whether the community want/demand these pit latrines, how involved they are in the design and how this fits with hygiene practices. I've seen many pit latrines built in rural Zambia that were never used. If it's just the team wanting them, then may need to check this. On the technical side, a key point would be to ensure that the latrines are not at risk of flooding, either by siting them carefully or by raising them above ground. Good luck