The removal of such blockages causes considerable costs. All building contractors and building owners are therefore urgently requested to ensure that the washing of building materials into the sewer system is avoided. Manholes and rainwater inlets located in the immediate vicinity of construction sites must be covered with sheet metal. Paved channels must always be kept clean of sand and debris. This also applies to troughs and ditches in the area of modified mixing systems, such as in Büchenbach. In the event of sewer blockages caused by the discharge of building materials, contractors and building owners must be held liable for the costs incurred.

The drainage company of the City of Erlangen repeatedly finds that large quantities of sand, gravel, lime and cement are washed into the sewer system during construction work on public roads and squares due to the inappropriate storage of building materials or the unfavorable position of construction machinery.

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Sewer blockage: Storing building materials safely