An innovative tool to increase tractive stress

Sewage flow accelerator system consisting of interlocking precast blocks

A large number of sewers run through the Düsseldorf city area and convey wastewater and stormwater to several treatment plants.

Every sewer is designed for certain hydraulic parameters to prevent overloading or the formation of dirt deposits due to insufficient flow rates. One of the verifications to be performed for this parameter range is to prove deposit-free operation by employing the so-called tractive stress analysis. This method verifies that a minimum flow rate of 0.6 m/s is adhered to at all times even under dry weather conditions with minimum stormwater inflow. By contrast,...

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