- measures lead to flow variation and sediment shifting processes  structural remodelling

- change of appearance  changing the length and depths of the river, current strength

- widening the channel describes the measure to broaden the riverbed at its sides

- as a result flow velocity of the water decreases and sediments accumulate to sand/gravel banks

- additional effort: Relocation of bank reinforcement to allow widening of the channel

- length extension: establishment of elements that alters the current as well as grading in the middle of the current  the result is a curvy course of the channel with an increased length compared to the initial current course

- appearance like a natural river

- cut and slip-off banks arise through the curvy course of the current

Basic information

Type: 
Retrofitting + Creation

Performance

Evapotranspiration 1 1
Shading none none
Reflection (Albedo) none
Water Conveyance 1
Water Infiltration 1
Water Retention 1
Water Storage none
Water Reuse none
Water Filtering 1
Water Bio-remediation 1
Deposition none
Bio-filtration none
Habitat Provision 2
Connectivity 1
Beauty / Appearance 1
Usability / Functionality none
Social Interaction none
Role of Nature / Mode of Action: 
- replication of natural river courses with sediment shifting processes and changing depth and width of the river - natural processes occur (filtering, storage, infiltration)
Technical & Design Parameters: 
- widening can be limited by bank reinforcement that cannot be relocated - widening can be limited at one side - protection against erosion is necessary at these parts of the river (length extension)
Conditions for Implementation: 
- Enough space for widening and extension of the length
Benefits & Limitations: 
Benefits: - Increased floodwater discharge capacity - Reduced flood risk - Ecological benefits (habitat for wildlife; vegetation) Potential limitations/disservices: - Limited space - an (urban) surrounding (e.g. streets, public places) near the channel may restrict the establishment of flora/fauna

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 730052 Topic: SCC-2-2016-2017: Smart Cities and Communities Nature based solutions