Water and leakage is a very serious problem, there is no way to stop water from flowing. If there is a leakage somewhere in the building, you try to stop at one point, water simply sipped and re-route itself. So someone should trace the source and stop it, not elsewhere. In infectious disease, we call this a " HOST " ya ?
Overseas they engage a building specialist to do the tracing.You know lah....."angmo " does it. In Singapore.....not sure lah.......maybe there is no such course/training yet in our Polytechnics or universities.