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- Polder abstract "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. There are three types of polder: Land reclaimed from a body of water, such as a lake or the sea bed Flood plains separated from the sea or river by a dike Marshes separated from the surrounding water by a dike and subsequently drainedThe ground level in drained marshes subsides over time and thus all polders will eventually be below the surrounding water level some or all of the time. Water enters the low-lying polder through water pressure of ground water, or rainfall, or transport of water by rivers and canals. This usually means that the polder has an excess of water, which is pumped out or drained by opening sluices at low tide. Care must be taken not to set the internal water level too low. Polder land made up of peat (former marshland) will sink in relation to its previous level, because of peat decomposing in dry conditions. Polders are at risk from flooding at all times and care must be taken to protect the surrounding dikes. Dikes are typically built with locally available materials and each material has its own risks: sand is prone to collapse owing to saturation by water; dry peat is lighter than water and potentially unable to retain water in very dry seasons. Some animals dig tunnels in the barrier, allowing water to infiltrate the structure; the muskrat is well known for this activity and actively hunted in certain European countries because of it. Polders are most commonly, though not exclusively, found in river deltas, former fenlands and coastal areas.".
- Polder thumbnail 2012-05-13_Nordsee-Luftbilder_DSCF8784.jpg?width=300.
- Polder wikiPageExternalLink internat_uk.htm.
- Polder wikiPageExternalLink hoe_e.html.
- Polder wikiPageExternalLink AlterraRapport358.pdf.
- Polder wikiPageID "48065".
- Polder wikiPageRevisionID "606744533".
- Polder hasPhotoCollection Polder.
- Polder subject Category:Artificial_landforms.
- Polder subject Category:Coastal_construction.
- Polder subject Category:Environmental_soil_science.
- Polder subject Category:Freshwater_ecology.
- Polder subject Category:Land_reclamation.
- Polder subject Category:Polders.
- Polder subject Category:Riparian_zone.
- Polder comment "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.".
- Polder label "Koog".
- Polder label "Polder".
- Polder label "Polder".
- Polder label "Polder".
- Polder label "Polder".
- Polder label "Poldery".
- Polder label "Pólder".
- Polder label "Pôlder".
- Polder label "Польдер".
- Polder label "أرض مستصلحة من البحر".
- Polder label "干拓".
- Polder label "干拓".
- Polder sameAs Polder.
- Polder sameAs Koog.
- Polder sameAs Πόλντερ.
- Polder sameAs Pólder.
- Polder sameAs Polder.
- Polder sameAs Polder.
- Polder sameAs Polder.
- Polder sameAs Polder.
- Polder sameAs 干拓.
- Polder sameAs 폴더_(간척).
- Polder sameAs Polder.
- Polder sameAs Poldery.
- Polder sameAs Pôlder.
- Polder sameAs m.0cws7.
- Polder sameAs Q106259.
- Polder sameAs Q106259.
- Polder wasDerivedFrom Polder?oldid=606744533.
- Polder depiction 2012-05-13_Nordsee-Luftbilder_DSCF8784.jpg.
- Polder isPrimaryTopicOf Polder.