Stream bed re-naturalization

Code: 
N05
Sector: 
Hydro Morphology
Other sector(s): 
Urban
The complete description of the NWRM: 
Summary: 

Streambed (or riverbed) represents the floor of the river, including each riverbank. In the past, riverbeds were artificially reconstructed with concrete or big stones, therefore modifying flows and decreasing fauna habitat and vegetation diversity. Those modifications were aiming at flood prevention or supporting changes of agricultural practices for example. This has led to uniformed flows in the rivers and often having effect of reducing travel time along the river. Streambed re-naturalization consists in removing some concrete or inert constructions in the riverbed and on riverbanks, then replacing them with vegetation structures, in order to avoid these damages and restore biodiversity.

The re-naturalization of river beds and banks could have a high impact on the erosion process. Stabilisation techniques are among the main measures to be implemented. The maximum impact is reached when the stabilisation technique restores the vegetation cover and the naturalness of the banks. Most of the time, techniques use plants for bank stabilization. According to their degree of complexity, these techniques can be grouped into two categories:

-          bank re-naturalization

-          plant engineering

Bank re-naturalization is a stabilisation technique used to correct mild erosion problems and that does not require a high degree of expertise to be implemented.

Plant engineering is defined as the techniques combining the principles of ecology and engineering to design and implement slope, bank and bank stabilisation works, using plants as raw materials for making vegetable frames.

Possible benefits with level: 
Benefits Levelsort descending
BP4 - Slow river water High
BP6 - Increase infiltration and/or groundwater recharge High
BP12 - Create aquatic habitat High
BP13 - Create riparian habitat High
ES4 - Biodiversity preservation High
ES8 - Erosion/sediment control High
PO1 - Improving status of biology quality elements High
PO10 - Protection of important habitats High
PO11 - Better protection for ecosystems and more use of Green Infrastructure High
PO13 - Better management of fish stocks High
PO14 - Prevention of biodiversity loss High
BP10 - Reduce erosion and/or sediment delivery High
BP14 - Create terrestrial habitats Low
BP17 - Absorb and/or retain CO2 Low
ES1 - Water storage Low
ES2 - Fish stocks and recruiting Low
ES6 - Groundwater/aquifer recharge Low
PO2 - Improving status of physico-chemical quality elements Low
PO5 - Improving quantitative status Low
PO6 - Improving chemical status Low
BP5 - Increase evapotranspiration Low
BP7 - Increase soil water retention Low
BP3 - Store river water Medium
BP9 - Intercept pollution pathways Medium
ES3 - Natural biomass production Medium
ES7 - Flood risk reduction Medium
ES9 - Filtration of pollutants Medium
ES10 - Recreational opportunities Medium
ES11 - Aesthetic/cultural value Medium
PO3 - Improving status of hydromorphology quality elements Medium
PO4 - Improving chemical status and priority substances Medium
PO7 - Prevent surface water status deterioration Medium
PO8 - Prevent groundwater status deterioration Medium
PO9 - Take adequate and co-ordinated measures to reduce flood risks Medium
BP11 - Improve soils Medium
BP16 - Reduce peak temperature Medium
Last updated: 08 Jun 2015 | Top