Implementing smart energy management concepts in WWTPs






In the map below, you can find examples of water protection measures within this topic. These actions are picked from the Bank of Actions - if you are interested to browse other water protection actions, visit the Bank of Actions.


Awareness raising

Hazardous materials

Littering etc.

Oil spill prevention

Research and monitoring

Shipping and boating

Stormwater management

Strategies and programs

Wastewater management


Drainage basin

Sustainable storm water management through biofiltration

Actor: City of Helsinki   ●   Year: 2015   ●   Address: Metsäläntie 2, Helsinki, Finland

© Kaisa Rosqvist / CITYWATER, Helsingin kaupungin ympäristökeskusA sustainable storm water management solution based on biofiltration was realised in Maunulanpuisto Park in Helsinki, in order to purify rainwater and meltwater and improve water quality in the Haaganpuro Brook.


Rainwater and meltwater collected in drains from a lively trafficked drainage area are channelled to a sedimentation basin, in which a large part of the solids sinks to the bottom. The water then continues its journey to the biofiltration area where it is allowed to pool, giving vegetation time to bind nutrients and heavy metals. After this, the water slowly permeates the filtrating sandy layers under the vegetation, during which harmful substances are absorbed by microbiological activity. Finally, the purified water is fed into the ditch via a drainpipe and onwards into the Haaganpuro brook.


© Kaisa Rosqvist / CITYWATER, Helsingin kaupungin ympäristökeskusAs the drainage area is heavily trafficked and paved with asphalt, high solid, nutrient and oil levels have occasionally been measured in the rainwater and meltwater entering the Haaganpuro brook. Such contamination is harmful to the fish stocks (e.g. trout) and other organisms in the brook. The biofiltration solution is the first of its kind in Helsinki. In connection to the solution, an info board describing the objectives and functionality of the solution as well as the general challenges that cities face regarding storm waters and their management (increasing rainfall and condensed urban structures) was erected in order to inform local residents on the issue.

Background information

The sustainable storm water solution was implemented within the EU LIFE+ financed CITYWATER- Benchmarking water protection in cities project. The objective of the project (2012-2015) was to facilitate and implement ambitious water protection measures. The solution also supports the City of Helsinki storm water strategy, which aims at changing management towards sustainable solutions and states that storm water should in first hand be infiltrated on spot, where it is created.

Further information

Name: Kajsa Rosqvist   ●  Email: kajsa.rosqvist (a)   ●  Web page:

Guidelines & Recommendations

Guidelines & Recommendations