Kumpula Stream’s channel was partly restored. Two new wet ponds will be built into the park area. In addition, the retention capacity in the existing ponds will be strengthened with dams. An almost 2 meter high noise barrier with plants will be built along Mäkelä street. The current, old plants will be replaced by several new plants. The valley shaped area will restored by removing the old rail embankment next to the stream’s channel.
The plans drafted in 2012-2014 included the Vallilalaakso Park plans, the Kumpula Stream storm water runoff calculations, the Kumpula Stream’s hydraulic modelling at Vallilaakso Park, and avirtual model that shows the rain flooding situations in 2, 5, 20, and 50 years time. The Vallilalaakso area is challenging from a geotechnical point of view.
The area’s residents took part in the planning, which was a challenging process.