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Rainwater, depending on the situation, may or may not be mixed with waste and faecal waters. Depending on this factor, water collection is classified as follows:
- Unitary system: the rainwater comes down via the same drainpipes as waste and faecal waters.
- Separated or separating system: consists of separating the discharge of waters. drainpipes, shafts and collectors are separately installed.
- Mixed system: consists of collecting rainwater and remaining waters separately, but using the same shafts.
