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I would check the area more extensively. I was in Malakal twice this year once on route to Mabaan through a field office in Malakal and the second time doing infrastructure assessments for the judiciary of South Sudan. In both cases the impression we had was of clay soil that tended to settle ... indeed many of the buildings including the circuit appeal court and judiciary buildings and hoses show cracking and other evidence of differential settlement.
The area is close to the Nile and we were repeated told of soft clay soils underlying most of Melaka which results in settlement of structures . I have just checked the assessment report and this is confirmed. Also most of the facilities and sites we checked had reticulated water which while not very clean (including our office / residence) was seen to be and told to be moderately reliable. I recall in the guest house we did not have water for about 25 percent of the time. Outside the centre of Melaka I have no information ... but all the evidence we saw and were told of suggested damp clays.

Chris