Kylmäojankorpi forested wetland, Vantaa, Finland

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.

The in-depth description of the case study:

cs-fi-01-final_version.pdf

NUTS Code:

Helsinki-Uusimaa

RBD code:

FIVHA2

Transboundary:

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

Light or indepth?:

In-depth

Water quality inflow:

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:

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.

Biophysical impacts

Runoff reduction:

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:

Peak flow rate reduction unit:

Information on Peak flow rate reduction:

Mean peak flows (6 rainfall events, Jul-Aug 2010) reduced

Water quality overall improvements:

Positive impact-WQ improvement

Water quality Improvements Phosphorus (P):

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):

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

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:

Success factor(s):

Type	Role	Comments
		Not relevant

Financing:

Type	Comments
Other	The main purpose was to retain a semi-natural forest in a rapidly urbanizing suburb of Helsinki.

Barrier:

Type	Role	Comments
		Not relevant

Driver:

Type	Role	Comments
		Not relevant

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:

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:

Ecosystem water supply:

Ecosystem impact climate regulation:

No information available

Information on Ecosystem flood control volume:

Risk of flooding downstream reduced

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:

Policy pressure:

Policy requirement directive:

Policy impact:

Policy wider plan:

Policy area:

Policy target:

Target purpose
Peak-flow reduction
Runoff control
Pollutants Removal

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:

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:

Contractural arrangements:

Design contractual arrangement:

Arrangement type	Role	Responsibility	Name	Comments
				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:

Design land use change:

Design authority:

Authority type	Role	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

Last updated: 18 Jun 2015 | Top

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Kylmäojankorpi forested wetland, Vantaa, Finland

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