Code N14 Sector Hydro Morphology The complete description of the NWRM n14_-_re-naturalization_of_polder_areas.pdf Summary A polder is a low-lying tract of land enclosed by embankments (barriers) known as dikes that forms an artificial hydrological entity, meaning it has no connection with outside water other than through manually operated devices. Its re-naturalization consists in enhancing polders with sub-natural characteristics, allowing better water storage in watercourses inside the polder, as well as increased biodiversity. Illustration(s) Polder of Juist (Germany)Source: http://commons.wikimedia.org/wiki/File:2012-05-13_Nordsee-Luftbilder_DSCF8997.jpg Possible benefits with level Benefits Level BP1 - Store runoff High BP2 - Slow runoff Medium BP3 - Store river water High BP4 - Slow river water Medium BP5 - Increase evapotranspiration Low BP6 - Increase infiltration and/or groundwater recharge Medium BP7 - Increase soil water retention Low BP9 - Intercept pollution pathways Low BP10 - Reduce erosion and/or sediment delivery Low BP11 - Improve soils Low BP12 - Create aquatic habitat High BP13 - Create riparian habitat Medium BP14 - Create terrestrial habitats Low ES1 - Water storage High ES2 - Fish stocks and recruiting Medium ES3 - Natural biomass production Medium ES4 - Biodiversity preservation High ES6 - Groundwater/aquifer recharge Medium ES7 - Flood risk reduction Medium ES8 - Erosion/sediment control Low ES9 - Filtration of pollutants Low ES10 - Recreational opportunities Low ES11 - Aesthetic/cultural value Medium ES12 - Navigation Low PO1 - Improving status of biology quality elements Medium PO2 - Improving status of physico-chemical quality elements Low PO4 - Improving chemical status and priority substances Low PO5 - Improving quantitative status Medium PO6 - Improving chemical status Low PO7 - Prevent surface water status deterioration Low PO8 - Prevent groundwater status deterioration Low PO9 - Take adequate and co-ordinated measures to reduce flood risks High PO10 - Protection of important habitats High PO11 - Better protection for ecosystems and more use of Green Infrastructure Low PO13 - Better management of fish stocks Medium PO14 - Prevention of biodiversity loss Medium Case study(ies) Polder management near Altenheim, Germany Full Context Pathway(aka Context) Default view Area(aka Level or Site) ALL