Talk:Polder

[Untitled]
spanish wikipedia has interesting content about this, so if somebody writes in English better than I do and is willing to translate a bit... --euyyn 21:44, 1 May 2006 (UTC)

Aswaswern
Is mentioned as a polder in the Netherlands Where is that? i guess what was ment was "Aarlanderveen" but am not sure so just write it here —Preceding unsigned comment added by 92.40.238.178 (talk) 23:00, 1 August 2010 (UTC)
 * I removed it. It is not an existing polder. It was added on 10:38, 17 May 2010 by 204.218.240.127. I viewed his/her talkpage, and it is full of accusations of unconstructive edits and vandalism. He/She is blocked now.Wiekelein (talk) 15:27, 5 December 2010 (UTC)

Georgia
Under the subheading United States, Georgia was listed under (quote:) "Examples of polders". I clicked the link, and found out that Georgia is a state in the USA. Perhaps there are examples of polders within Georgia, but these are not mentioned in the article Georgia (U.S. state), and I have not been able to find any information about that.

It is also possible that there his a polder named 'Georgia' in the United States which happens to have the same name as the state, but in that case, the link is incorrect. And I have not been able to find information about any polder with that name.

So, I removed this section. If there are any polders in the US (which wouldn't surprize me - it's such a big country with a diverse topography), and you have information about that, please add that information to the article. Johan Lont (talk) 15:38, 14 October 2008 (UTC)
 * This was a case of vandalism by 70.172.222.131, who changed New Orleans to Georgia. He also changed Bremen to st. Petersburg. I restored both (after more than a year!) --Joostik (talk) 16:21, 11 November 2009 (UTC)

Examples of Polders
According to a 2009 Tour de France web page: http://www.letour.fr/2009/TDF/COURSE/us/100/etape_par_etape.html, the Principality of Monaco also has/uses polders. Dick Kimball (talk) 18:47, 8 June 2009 (UTC)
 * Those seem to be landfills rather than polders; in other words the areas were heightened instead of drained.--Joostik (talk) 16:34, 11 November 2009 (UTC)

New Orleans Dike System failure risk.
"The risk of the (repaired) New Orleans dike system in the future collapsing due to sea flooding is estimated at 1 in 100 years" That's not correct. The New Orleans Dike System is designed to a "100-Year Flood Event" level. This does not mean the dike system will fail once every 100 years; it means that the system is designed to withstand the flooding that occurs every 100 years on average. The higher the number (25-, 50-, 100-, and 500-year being the most common), the higher the flood level; the higher the flood level, the more complex (and expensive and expansive) the system.

The Wiki article 100-year_flood has more detail about the probability of a 100-year event occurring in a particular year and how the 100-year flood level is determined. Esaons (talk) 13:33, 13 September 2010 (UTC)
 * You are correct though in stead of fixing it I have removed the statement as I found the statement more like boasting than adding useful information. Reboelje (talk) 20:13, 17 January 2011 (UTC)

New Orleans is not a single Polder; the metro area has several polders and subpolders: https://www.researchgate.net/figure/248880509_fig1_Fig-1-Map-of-New-Orleans-and-South-East-Louisiana-area-showing-geographic-bounds-of — Preceding unsigned comment added by NarrowlyLearned (talk • contribs) 21:28, 3 July 2017 (UTC)

Monaco & Singapore examples
I have my doubts about the Monaco and recently added Singapore examples being true polders. They seem to be land reclamation sites where the sea was just filled in to raise the land level above the sea level. Can anyone confirm? If not then I think it is better to remove them, the list is already taking up more than half the article. Reboelje (talk) 18:56, 12 September 2012 (UTC)

Ground level subsides?
First, I must admit that the term "polder" was unknown to me until about ten minutes ago; so, my understanding is quite limited. I have the impression that the term refers only to the collection area, situated between the lowland and the dike/levee, that accumulates excess water from the lowland and not to the combination of both the drained lowland and its associated collection area. But some parts of the article cause me to question that interpretation.

Given that, I found the following sentence particularly confusing:

"The 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."

Is not the polder always below the level of the surrounding water (other than, perhaps, at low tide)? For that matter, is not the polder floor also always below even the ground-water level of the drained land?

Given that a polder, as I understand it, is always wet, why would the ground level in it "subside"?

Near as I can figure, the sentence may actually refer to the sinking ground level of the land being drained, rather than to that of the polder where the runoff water collects. Perhaps the phrase "all polders" should be removed so that it reads: "The ground level in drained marshes subsides over time and thus will eventually be below the surrounding water level some or all of the time."

The fact that the ground level drops when water is removed from the soil seems to be a key concept for understanding the purpose of having a polder between the dried land and the coastal water.

A functionally similar system, which might be worthy of reference, is a sump (a low area, commonly found in a basement, intended to accumulate the excess water draining from the "dry" areas and which may be pumped out). However, unlike the situation with a coastal polder, the dry area maintained by a sump is typically not a type that sinks when the water is removed. A somewhat less similar, but possibly also related, concept is the bilge on a ship.Starling2001 (talk) 15:47, 13 December 2012 (UTC)
 * A polder is an area of land where the water level is artificially controlled to protect it from flooding (or getting too wet to be of use). This is achieved by surrounding it by dikes or levees so water cannot get in from the outside and draining it by a network of drainage ditches. Water is taken out of the polder through a sluice gate (free draining) when possible and otherwise by mechanical means (windmills or pumping stations). The polder land surface is not necessarily below the surrounding water level but has to be protected from occasional flooding or getting too wet to make agricultural and other uses possible. The ground level subsides because the water table is artificially lowered which causes clay soil to dry out and peat to decompose. However the statement that all polders will eventually be below the surrounding water level is too strong. I think it should read "The ground level in most polders subsides over time which may cause previously free draining polders to eventually be below the surrounding water level some or all of the time." Hope this helps. Reboelje (talk) 23:00, 13 December 2012 (UTC)

image
The lead image isn't a polder. It may become one after some decades. --Ikar.us (talk) 11:31, 13 July 2016 (UTC)

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