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Home>About Iv > Insights & News > 2018 > How Iv-Infra uses a stress test to map bottlenecks in the Rijksstraatweg sewer system
How Iv-Infra uses a stress test to map bottlenecks in the Rijksstraatweg sewer system

A road intensively used

Cyclists, pedestrians, motorists and buses: the Rijksstraatweg in Duivendrecht is a road intensively used by all types of traffic. When joining the Rijksstraatweg from the neighbouring residential area, driving into the residential area from the road or simply crossing over the road, visibility is limited and leads to unsafe situations. To improve road safety and optimise the riding comfort of the cycle paths, a reconstruction of the road will take place. This reconstruction will be tackled integrally whereby the sewer system will also be taken into consideration. One of the first steps is to map the existing situation and identify possible bottlenecks in the sewer system. Iv-Infra gains this insight by performing a stress test.

What exactly does the stress test map?

When mapping the current situation and potential sewer system bottlenecks, it is investigated, among other things, how the existing system works: what the ground level height is and that of the paved area? How does the sewer work and how does rainwater flow from the ground level into the sewer? Following this, the existing sewer is hydraulically calculated using a certain rainfall intensity. This calculation must determine, whether or not, the existing sewer is able to store the amount of rainwater produced by a normative shower. If the existing sewer cannot hold this amount of rainwater, a further calculation is determined of where in the system this problem arises, how much and for how long will water remain on the street. With this, we are mostly focussing on locations with increased risk.

Finding feasible solutions within limited space

Suppose it appears that the existing sewer is unable to store the water, a new, separate sewer system will need to be designed (either locally or entirely), whereby no water will remain on the street with the same normative shower. The challenge presented by this is the limited available space. The Rijksstraatweg is characterised by its avenue appearance, with buildings, trees and roadside parking on both sides of the road. The cycle path and pavements are separated from the road. Finding the right technical solution that is robust and future-proof as well as feasible and environmentally fitting, therefore requires an integral approach in which the various functions of the public space are cleverly combined. We, therefore, critically consider which (dis)connection opportunities we can further utilise.

Components of the integral road reconstruction

In addition to the sewer system design, Iv-Infra will also provide the design for the cycle paths and footpaths, prepare the contractual documents, supervise the tendering process and provide support to the municipality with environmental management.
Would you like to know more about this project or the stress test? Paul will be pleased to tell you more. Contact him via 088 943 3200 or send an email.
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