Drainage systemsMarch 25, 2020
A basic distinction is made between two systems, mixing and separation systems.
The designation explains how the drainage technology works. Waste water is diverted through buildings through various pipes to the main pipe. It is led into the public sewerage system via an end channel. In a mixing system, all wastewater in a pipe is mixed. The separation system has separate lines for dirty and rain water.
Despite the higher costs in operation and installation, many opt for a separation system. The relatively high water pollution caused by untreated wastewater in mixed systems speaks against this system.
The waste water is discharged via a mixed pipe. Dirty and rainwater may only be brought together in the main pipe or collecting pipes. In the case of manifolds, the wastewater must be brought together as close as possible to the connection channel.
Today there is only the need to drain contaminated rainwater through the mixed water system. Since there used to be a general requirement to connect the drainage of rainwater, larger areas of the area are often connected in grown mixing systems and thus have an effluent effect.
Since precipitation cannot be calculated 100% in advance, the system must also be able to cope with large fluctuations. On the other hand, since economy also plays a major role, there is a need to limit the channel size.
The system may be overloaded in heavy rain well above the assessment basis. Regulation is planned for discharge systems in the sewage system. Mixed water is also fed directly into bodies of water via this. However, this only happens in extreme exceptional cases and very sensitive waters are protected against pollution with further precautions.
Collected rainwater or rainwater, for example from roofs and other sealed surfaces, is collected separately from the waste water.
It must not be discharged into the connection, drain and collecting lines for dirty water.
It is mainly discharged into nearby water or an infiltration system to minimize the risk of flooding after heavy rain.
From an ecological point of view, rainwater infiltration in a ditch is particularly recommended, as the water is not only temporarily stored here, but also purifies it.
Make rainwater usable
It is of course also possible to use the rainwater for irrigating your own property or as process water.
There is a large selection of tanks and rainwater tanks available. This saves the costs for the water supply in your own garden, rainwater is already decalcified and therefore optimally tolerated by the plants.
Calcification is also reduced as process water for the washing machine or lavatory rinse and fewer washing additives are required