General National Id Finland_01 Site name Kylmäojankorpi Summary The Kylmäojankorpi case study represents research work where water quality (dissolved oxygen, electrical conductivity, turbidity, and temperature) and stream-stage measured continuously. The existing forest wetland (c.a. 11ha), Kylmäojankorpi, is located in Vantaa city which is neighboring the capital city Helsinki. The study results show that forested wetland improves and regulates stream water quality and flow regime. The obtained knowledge can be used to estimate environmental effects from the similar type of forested wetlands in urban areas. Light or indepth? In-depth The in-depth description of the case study cs-fi-01-final_version.pdf NUTS Code Helsinki-Uusimaa RBD code FIVHA2 Transboundary 0 Data provider Kristina Veidemane, BEF Source(s) The regulation of stream water quality and flow by a forested wetland, Kylmäojankorpi, Vantaa. NWRM(s) implemented in the case study Urban forest parks Basins and ponds Wetland restoration and management Longitude 25.036 Latitude 60.33989 Site information Climate zone cool temperate moist Mean rainfall 650 Mean rainfall unit mm/year Average temperature 4,90000009536743 Mean runoff unit 450 - 600 mm Average runoff coefficient 0,200000002980232 Type Case Study Info Water quality inflow 2 Water quality inflow unit mg/L Mean annual runoff range 150 - 300 mm Average slope range nearly level (0-1%) Vegetation class Site surrounded by discontinuous urban fabric (112) and industrial or commercial units (121); actual site is 100% covered by vegetation (tree canopy and ground vegetation) Monitoring maintenance Monitoring impacts effects 1 Performance Performance impact estimation method Catchment outlet Performance impact estimation information The case study represents a research project where water quality (dissolved oxygen, electrical conductivity, turbidity, and temperature) and stream-stage measured continuously. Intermittent water samples for chemical and biochemical analysis were also taken during base flow and rainfall events for more detailed study of wetland impacts on water quality and export loads of solutes. Design & implementations Application scale Field Scale Area (ha) 11,3000001907349 Area subject to Land use change or Management/Practice change (ha) 37,2999992370605 Size 37,2999992370605 Size unit ha Constraints This is a protected area to maintain a semi-natural forest and wetland in an urbanizing landscape. The main factors influencing site selection are thus pre-existing flow paths and historical land use. Inflow volume 0,0149999996647239 Inflow volume unit m3/sec Outflow volume 0,00700000021606684 Outflow volume unit m3/sec Peak flow rate 0,0299999993294477 Public consultation 0 Contractural arrangements 0 Design contractual arrangement Arrangement type Responsibility Role Comments Name Site protected in 2000 (given conservation area status). The study of the water quality and flow regime was conducted within the MSc programme of the HELSINKI University Design consultation activity Activity stage Key issues Name Comments Design land use change Land use change type Design authority Authority type Role Responsibility Name Comments Other Implementation Vantaa City In charge of spatial planning in the area Forest owners Other Vantaa and Helsinki Parish Church Council Regional / sub-national water authority Monitoring Water Protection Association of the River Vantaa and Helsinki Region Regional / sub-national water authority Other Finnish Government, Uusimaa Centre for Economic Development, Transport and the Environment (ELY) Regulatory framework for wetland protection University of Helsinki Conducted the study to assess effectiveness of wetland for NWRM and pollutant attenuation Lessons, risks, implications... Key lessons The Kylmäojankorpi case study represents a research work which aimed to assess whether and how existing forested wetland improves and regulates stream water quality and flow. Financing mechanism 0 Success factor(s) Success factor type Success factor role Comments Financing Financing type Comments Other The main purpose was to retain a semi-natural forest in a rapidly urbanizing suburb of Helsinki. Barrier Barrier type Barrier role Comments Not relevant Driver Driver type Driver role Comments Not relevant Financing share Financing share type Share Comments Policy, general governance and design targets Policy description The study monitored a forest wetland, Kylmäojankorpi, in Vantaa city. Because of the large amount of land sealing surrounding the wetland, there are potential problems with flashy runoff and water quality. Part of wider plan 0 Policy target Target purpose Peak-flow reduction Runoff control Pollutants Removal Policy pressure Pressure directive Relevant pressure Policy area Policy area type Policy area focus Name Comments Policy impact Impact directive Relevant impact Policy wider plan Wider plan type Wider plan focus Name Comments Policy requirement directive Requirement directive Specification Socio-economic Direct benefits information The economic benefits from maintaining forest wetland in urban areas have not been estimated. Costs investment information this is not relevant Costs operation maintenance this is not relevant Costs total information this is not relevant Ecosystem improved biodiversity 1 Information on Ecosystem improved biodiversity The protected area and wetland complex will provide more natural habitat and may contribute to meeting Habitats Directive requirements. Ecosystem provisioning services 0 Ecosystem water supply 0 Ecosystem impact climate regulation No information available Biophysical impacts Runoff reduction 38 Runoff reduction unit % Percent Information on runoff reduction Stream discharge (Jun †“Aug 2010) decreased, i.e. reduced runoff and risk of flooding downstream, which is housing areas Peak flow rate reduction 47 Peak flow rate reduction unit % Information on Peak flow rate reduction Mean peak flows (6 rainfall events, Jul-Aug 2010) reduced Information on Ecosystem flood control volume Risk of flooding downstream reduced Water quality overall improvements Positive impact-WQ improvement Water quality Improvements Phosphorus (P) 54 Water quality Improvements (P) unit ppm Water quality Improvements Nitrogen (N) 1,70000004768372 Wq Improvements n unit mg/L Water quality Improvements Total Suspended Solid (TSS) 5 Water quality Improvements (TSS) unit mg/L Water quality Improvements Copper (Cu) 2,29999995231628 Water quality Improvements (Cu) unit ppm Water quality Improvements Zinc (Zn) 10,3000001907349 Water quality Improvements (Zn) unit ppm Water quality Improvements Escherichia Coli (e.coli) 296 Water quality Improvements (e.coli) unit cfu Soil quality overall soil improvements Neutral impact-no change in SQ status Full Context Pathway(aka Context) Default view Area(aka Level or Site) ALL