Drainage system works by creating a sump to collect the condensed water and using a pump to dispose it off through using a drainage system. 

It is an efficient method, but it comes at a heavy price because the cost of building the sump, and maintaining the pump to make sure it operates, is very expensive. Moreover, the pipes used for drainage would look ugly on the exterior. This system also cannot be implemented on a built project.

Hydraulic elevators
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