Reducing the amount of point source loading
It is thought that climate change will increase the occurrences of extreme weather, increasing the risk of flooding in cities. The storm water from the roads and industrial areas that enters ditches, streams and onwards to the sea may contain hazardous substances to such an extent that there is a need to study the quality of the storm water and clarify the need for treatment.
The management of storm water in the city can best be advanced by preparing a plan for handling storm water, which specifies the main principles and procedures for managing storm water. During flood situations, sewage water from the combined sewer has to be discharged as an overflow to the sea. The amount of storm water entering the combined sewer can be reduced by upgrading the network, thereby reducing network overflows entering the sea.
Helsinki and Turku...
• The cities will prepare up a storm water handling plan which clarifies, for example:
• Increase the renovation of the sewage network, try to minimize wastewater overflow, and possibly try to channel the fees paid for using the combined sewage network primarily to improving the network. Minimise overflows particularly by upgrading areas with combined sewage systems. Encouraging real estate owners to direct drainage and rainwater from their properties into the storm water sewer, if they are directed to the present wastewater or combined sewer.
