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HorseTail
On Tue, 12 May 2015 13:55:51 +0200,
Martin wrote: Locally they pump water from the Rhine and spray it onto the dunes, where the water works are located. The dunes act as a natural filter. Recently they have skimmed the top off the dunes "to remove alien plants". It could be to remove the nasty substances that were in the water from the Rhine. They should rather consider covering the dunes with some of the plants which serve as a host for water cleaning bacteria. We have Iris, Salicaires, and Scirpes (I do not know their english, nor the latin names) for that purpose. Common reed is okay and chosen more often, while a combination of different species is best. If the dunes were to be “cleaned”, they would have to be leveled completely, or replaced, as their tops will not contain most of the realy nasty stuff, if any. Maybe they just began to look ugly with the decomposing sludge which should cover the sand after a wile. But chances are, those workers just removed alien plants. ;-) Michael -- Location: Lower Normandy (Orne), France GnuPG/OpenPGP 4096R/3216CF02 2013-11-15 [expires: 2015-11-15] sub 4096R/2751C550 2013-11-15 [expires: 2015-11-15] [Next key will use elliptic-curve algorithm! :-) Get GnuPG!!] |
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