OPTAIN: Sävjaan river catchment [Sweden]

Year of issue
2025
Summary

Sävjaån catchment is a lowland mixed land use catchment characteristic of central Sweden. Headwaters in the catchment drain a mixture of forest and agricultural land. Streams draining agricultural land are general deepened and straightened to promote drainage. Localized spring floods are common and summer droughts are increasing. Eutrophication is an issue throughout the catchment.

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Location
59.83054168118, 17.670219687235
Project
OPTAIN
Sector
Hydromorphology
Implementation status
Modeled

Overview

Country
Sweden
NUTS2 Code
Östra Mellansverige
Sponge measures implemented in the case study
Wetland restoration and management
Buffer strips and hedges
Floodplain restoration and management

Site Information

Climate Zone
Cool temperate moist
Precipitation
639.00 mm
Temperature (°C)
6.00 °C
Elevation range
0–100 m a.s.l.
Groundwater level
< 5 m
Vegetation class
Riparian grasses, wetland vegetation, crops in adjacent fields
WFD Ecological status
Good
WFD Chemical status
Good

Design and Implementation

Project scale
Micro
Project scale specifications
localised ditches and buffer strips in fields
Project area
Varies; local plots to small sub-catchments (0.5–100 ha)
Project area specifications
Rural, cropland, ditch networks
Principles
Riparian areas proximal to streams and ditches that are not in agricultural production
can slow the movement of particulate matter and water from fields to receiving
waters, thereby potentially limiting peak flow.
Drainage ditches with a "bench" or floodplain can slow the movement of water and
retain nutrients, benches function as wetlands when wet.
Wetlands/ponds are created to retain nutrients and prevent drought/flooding.

Policy and Governance

Land ownership
Mixed ownership: individual, company, community/ village; cooperative arrangements with farmers
Policy targets
Pollutants Removal
Requirement directive
Requirement directive
WFD-mitigation of significant pressure
Part of a wider plan
Yes
Wider plan
Wider plan type Wider plan focus Comments
Regional Water Regional/catchment-based strategy under EU directives
Public consultation
No
Has contractual arrangements
No

Impacts and Monitoring

Monitoring System

Presence of formal monitoring system
No structured long-term monitoring in place

Maintenance

Maintenance requirements
Tree trimming, vegetation removal (annual to every 5 years), sediment management

Lessons Learned

Barriers
Barrier type Barrier role Comments
Lacking financing sources — No long term financial support from competent authorities
Expected maintenance needs Main barrier unclear maintenance financing, Need for ongoing maintenance
Drivers
Driver type Driver role Comments
Legal obligations Main driver EU Water Policy
Other Main driver research-based evidence of effectiveness
Success factors
Success factor type Success factor role Comments
Other Main factor simplicity, ecosystem based&nbsp;
Attitude of relevant stakeholders Main factor farmers collaboration