(NATTE/ZOUTE) DROOM OF NACHTMERRIE – 3

 

| 09-11-2014 | 11:00 uur |


(NATTE/ZOUTE) DROOM OF NACHTMERRIE – 3

 

OOSTZEE

Satelietopname van de blauwalg in de Oostzee

De landsregering heeft de “ontwerp-rijksstructuurvisie Grevelingen en Volkerak-Zoommeer” vastgesteld en daarmee het voornemen kenbaar gemaakt een beperkt getij terug te brengen in het Volkerak-Zoommeer en deze wateren op termijn te verzilten. In het artikel van vorige week over de gevolgen/risico’s verbonden aan de verzilting liet ik zien dat blauwalgen ook voor komen in zout water. Met als voorbeeld de blauwalg ellende in de Oostzee (Baltic-Sea).

Bij een ontwerp-rijksstructuurvisie wordt ook altijd een Milieueffectrapport gepresenteerd waarin normaliter alle mogelijke effecten en risico’s van een maatregel, zoals het verzilten, door deskundigen is geïnventariseerd. Dat is ook nu het geval. In 190 pagina’s komen tal van mogelijke en soms ook te verwachten risico’s en effecten aan het bod, behalve mijn stelling en uitleg dat met het verzilten van het Volkerak-Zoommeer de blauwalgproblematiek weer op kan duiken. Ben ik nu gek of onwetend of is het voor veel geld tot stand gekomen nieuwe milieueffectrapport mogelijk onvolledig of gezuiverd van alles wat over het verkondigde ‘heil’ van de verzilting twijfel op kan roepen?

Ik ben iemand die al heel lang, volgens sommigen te lang, zich verdiept in het Volkerak-Zoommeer en steeds heeft verkondigd dat de natuur het blauwalgprobleem zou oplossen en dat verzilting van een meer, met beperkte doorstroming en veel voedingsstoffen als nitraten en fosfaten, de problemen niet met zekerheid hoeft op te lossen. Omdat ik zolang meedraai en me niet door duur betaalde ‘deskundigen’, die geneigd zijn te vertellen wat de betaler wil horen, het zwijgen op laat leggen en gewoon blijf nadenken, heb ik eens gekeken wat in een eerder milieurapport over het Volkerak-Zoommeer met betrekking tot de risico’s van verzilting werd geschreven.

In april 2012 verscheen de Ontwerp MER “Milieueffectrapportage waterkwaliteit Volkerak-Zoommeer”. 298 pagina’s dik en vol met mogelijke effecten en risico’s van onder andere een mogelijke verzilting. In tegenstelling tot het nieuwste rapport hadden opdrachtgevers van toen ook een aantal buitenlandse deskundigen om hun mening gevraagd. Op pagina 145 van de rapportage uit 2012 is in een “Expert review” d.d. oktober 2006 onder het kopje ‘risico’s en bijwerkingen’ te lezen:

  • “Een zout Volkerak-Zoommeer zou een habitat kunnen gaan vormen voor schadelijke mariene algensoorten.
  • Langdurige perioden van sterke gelaagdheid en een gering zoutgehalte in de bovenste waterlaag zouden kunnen leiden tot een hoge concentratie van micro-algen, die buiten het bereik blijven van algenetende bodemdieren, zoals mosselen.”

Eveneens hebben de experts gemeld dat de spontane herintroductie van mosselen etc. te positief is geschat. Die buitenlandse deskundigen achten het dus mogelijk dat (blauw)algen ook in een zoutmilieu op zouden kunnen gaan treden en overlast kunnen gaan veroorzaken. Moeten we voor verzilting en het beperkt getij dan 280 miljoen euro uitgeven? Terwijl we nu vrijwel van de blauwalg overlast verlost zijn en de zoete natuur zich prachtig heeft ontwikkeld! Het antwoord van de BSD is helder: de onnodige verspilling van geld en de vernietiging van de mooie natuur kan nog voorkomen worden. 

Louis van der Kallen 

 


 

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