Archived from the original on 2015-04-02. Retrieved 2023-09-17. "Sigmaplan". www.sigmaplan.be. Retrieved 2023-09-21. "Scheldemug voorlopig afgeremd". De...
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Appeal Democrat, Retrieved on August 12, 2009 http://www.sigmaplan.be/nl/sigmaplan/hoe-is-het-sigmaplan-ontstaan Archived 2015-09-16 at the Wayback Machine...
16 KB (2,187 words) - 13:15, 3 June 2024
Standaard (in Flemish). Retrieved 9 May 2012. "Hoe is het Sigmaplan ontstaan?" (in Flemish). Sigmaplan. Archived from the original on 5 October 2013. Retrieved...
118 KB (4,073 words) - 12:10, 20 August 2024
of Hedwigepolder was proposed. In Flanders, where people worked on the Sigmaplan [nl], they proposed the depoldering of part of the Prosperpolder [nl]...
12 KB (1,207 words) - 00:01, 24 January 2023
tide) with a nature development function. In the framework of the Belgian Sigmaplan, aimed at protecting the whole river basin against floods, more areas...
2 KB (280 words) - 08:51, 20 February 2024