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Some generally good advice (not specific to tents / refugee camps) on black cotton soils is found on http://civil-engg-world.blogspot.com/2012/06/black-cotton-soil.html. Sorry it will not help the tents themselves but may assists in some of the associated infrastructure of a camp. Again as Jan points out, more don’ts than does.
Optimum solutions are to try and keep it drained without ponding, ie drains using natural terrain and a suitable invert slope if no other choices. If you plan to be in location for any period of time and alternatives are few although available surface are is acknowledged as limited consider mass planting of grasses that absorb water (bamboo and vetiver families are found in South Sudan). Sorry cannot be more help CN

Some generally good advice (not specific to tents / refugee camps) on black cotton soils is found on http://civil-engg-world.blogspot.com/2012/06/black-cotton-soil.html. Sorry it will not help the tents themselves but may assists in some of the associated infrastructure of a camp. Again as Jan points out, more don’ts than does.
Optimum solutions are to try and keep it drained without ponding, ie drains using natural terrain and a suitable invert slope if no other choices. If you plan to be in location for any period of time and alternatives are few although available surface are is acknowledged as limited consider mass planting of grasses that absorb water (bamboo and vetiver families are found in South Sudan). Sorry cannot be more help CN REDR Expert