Towards cost-effective hybrid solutions and higher adaptive capacity in urban water management

Challenges in water management caused by climate change can be, for example, storm water floods caused by heavy rain or problems for buildings arising from an elevated groundwater level. At present, storm waters from the city centre add a considerable load to the Enonselkä basin, both in terms of nutrients and harmful heavy metals.

RAINMAN project

Starting in spring/summer 2018, the RAINMAN project will respond to surface and groundwater challenges arising from urban growth by providing solutions to practical planning issues in the St Petersburg area and in various urban regions in Finland. Lahti focuses mainly on managing groundwater quality in the changing climate.

As a result the existing groundwater model will be updated and integrated with climate and weather data. The data will be supplemented by installing weather stations equipped with automatic measurement sensors. The impact of changing precipitation conditions on groundwater amount, flow direction and discharge areas will be modelled by means of a groundwater model as well as by weather and climate data collected.

Management of storm water with cost-effective hybrid solutions

Implemented between 2016 and 2018, the city service consortium’s project for the management of storm water with cost-effective hybrid solutions will significantly reduce the storm water load to Lake Vesijärvi. This is also one of the Government Programme’s key projects.

Treatment of urban storm water will be improved through the project in the Ranta-Kartano area using distributed systems, such as swales and green roofs as well as infiltration and detention basins. In addition, some of the storm water will be transferred for treatment in a storm water treatment system to be built in the Western Hennala area. The system will utilise new natural treatment solutions, such as biofiltration.

The project will utilise the storm water know-how of local actors and will function as a product development environment in storm water management and nutrient recycling solutions. The operation of new structures for managing storm water will also be investigated during the project and practical storm water planning will be supported in the future, too.

Further information form the City of Lahti

About the Rainman project
Water Protection Planner Riikka Mäyränpää, +358 50 3836 498
Environmental Director Saara Vauramo, +358 44 716 1585

About the Management of storm water with cost-effective hybrid solutions
Water Protection Planner Juhani Järveläinen, tel. +358 (0)50 559 4083
Water Protection Manager Ismo Malin, tel. +358 (0)50 525 9579