Having recently returned from cyprus, i was amazed at the lack of guttering around the houses,not being a builder i asked a builder friend about this when i got back, having been to cyprus himself he said that the houses are probably built on a concrete raft, and because the roof overshoots the walls by 600mm, when it does rain the water simply goes underneath the concrete raft and undermines the whole structure, therefore making the houses prone to subsidence.
If this is the case ,why dont the developers install guttering when building,especially as you seem to have a water problem and the rain water could be stored and used for the toilet,garden,driveways etc.
Please enlighten me