This report is about the implementation of realtime control with the DORA method, which is a
model predictive control scheme, in Kolding sewer system, where a rulebased control scheme have
already been implemented. Climate change increases the load on the sewer systems. Therefore this
report investigates if it is possible to reduce combined sewer overflows (CSO) to the recipients, by
changing the control scheme.
A screening of the potential for reducing CSO in Kolding sewer system, has shown that there is
potential to reduce CSO even more than the current control scheme. Where it has been found, that
there is potential for reduktion of CSO, by changing the control scheme.
By implementing the DORA control scheme it has been found that it is possible to reduce CSO
volume in the system by 9 % over a whole year, based on rain events from 2012. The reduction is
in the same order of magnitude as the increase in yearly mean precipitation before year 2100 as a
result of climate change.
It has been attempted to protect specific recipients by using weights on CSO structures in the
system. The results of this are mixed. As the weight matrices used in the project, have been made
without taking the geometry of the system into account, and that means some weight matrices leads
to worsenings, compared to the current situation.