Planting along watercourses: how to screen suitable land
Updated
Where can trees be planted along a watercourse, and where should planting be avoided? Systematic screening using public data provides a useful initial answer before specialists and landowners make their assessments.
Step 1: create a buffer along the watercourse
Draw zones along the official mapped watercourse line, for example at 10 and 20 m. This is where shade and bank stability typically matter.
Step 2: exclude areas that should not be planted
- Nature areas protected under § 3 (Section 3 of the Danish Nature Protection Act), where planting is generally not permitted.
- Existing woodland and tree cover.
- Land subject to other restrictions known to the municipality.
Step 3: mark lowland soils
Carbon-rich lowland soils may be better suited to rewetting than woodland, and afforestation grants are not available for lowland soils with more than 6% organic carbon, according to SGAV (the Danish Agency for Green Transition and Aquatic Environment). Mark these areas so they can be assessed separately.
Step 4: classify
Classify the remaining land as suitable, conditionally suitable or unsuitable, and calculate the area for each stretch of the watercourse. This makes it easier to prioritise in discussions with landowners.
Step 5: obtain expert validation
A screening is a preliminary outline. Soil conditions, drainage, access, the landowner's wishes and the condition of the watercourse must be assessed on site. Effects relating to shade, nitrogen and phosphorus should only be stated as ranges from the literature, with source references.
Frequently asked questions
Is screening enough to proceed with planting?
No. It shows where a closer look is worthwhile. Expert assessment and the landowner's agreement come afterwards.