Rainwater harvesting can help save drinking water as it can be used for watering gardens, flushing toilets or washing clothes. This reduces dependence on municipal water supply systems and promotes a more sustainable use of water resources. Households and municipalities that use rainwater therefore not only benefit from lower water costs, but also from an active contribution to environmental protection and resource conservation.
The implementation of such systems requires investment for acquisition and maintenance, but offers long-term benefits. The cost of purchase and installation is between 2,500 and 5,000 euros. It is essential to ensure that the rainwater tank is the right size, as the costs for this account for a large proportion of the total costs. In addition, the technical equipment for rainwater harvesting, including filters and pumps, must be regularly maintained to ensure its efficiency and functionality. This can also incur costs. If a household of four people saves 40 cubic meters of drinking water per year by using rainwater, up to 300 euros can be saved annually - provided no wastewater charges are levied.
The use of rainwater systems can also play an important role in preventing urban flooding. The systems collect rainwater directly from the roof and store it instead of letting it flow into the sewer system. During heavy rainfall, the collected water can then be used in a controlled manner to reduce the pressure on urban sewage systems. This significantly reduces the likelihood of flooding, especially in areas with inadequate sewer infrastructure.
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