Editing Aller (Germany) (section)

==== Flood protection in Celle region ====
[[File:AllerAltencelle.jpg|thumb|The canal-like widened Middle Aller near [[Altencelle]]]]
As early as the 1980s the town of Celle had drawn up a "Plan for Flood Protection of the Celle Region".<ref>[http://www.celle.de/media/custom/342_6602_1.PDF Rahmenentwurf zum Hochwasserschutz der Region Celle]</ref> This described a combination of widely varying measures, such as excavation of the river shore, flood basins and dykes. On 6 June 2005 the town received authority to start the first stage of the flood protection project. In 2006 work was begun.<ref>[http://www.nlwkn.niedersachsen.de/master/C14994627_L20_D0_I5231158_h1.html NLWKN: Start der Hochwasserschutzprojekte in Celle]{{dead link|date=July 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> This first part of the work entailed excavation of the river shore between Boye and the confluence with the river Fuhse, which were intended to increase the cross-section of the Aller channel during high water periods.<ref>[http://cdl.niedersachsen.de/blob/images/C17829250_L20.pdf Übersichtskarte der Vorlandabgrabungen in der Region Celle]{{dead link|date=July 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> The flood basins have an area of about {{convert|15|ha|acre}} and are {{convert|1.5|m|ft}} deep, requiring about {{convert|240000|m3|ft3}} of earth to be washed away. The cost of the project came to around {{Euro|2{{nbsp}}million}}. Only two years later, it was determined that these first interventions of the river system had resulted in sand being permanently deposited in the Aller producing shoals. In May 2009, the shipping channel was dredged for the first time in the vicinity of the new flood basins so that ships could once again pass through. Now,{{when? |date=November 2024}} it is planned to redesign the basins and, in some cases to fill them in, in order to reduce the future dumping of sand.