Quote:
Originally Posted by ben
Draenog....
Yes im aware that sewage treatment has been increased considerably hence the claims that water was overly clean. However flooding upstream in the valleys and more rural areas often washes all sorts off roads and agricultural land into storm drains that connect to the sewage systems. These sewers don't have the capacity to cope and there is untreated contaminated water (sewage, fertilisers, oils, pesticides chemicals etc) escaping left right and centre which eventually finds its ways to the cockle beds. Why they are so periodically sensitive remains a mystery.
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Ben
Yes I'm aware of this (I'm an environmental scientist working in this area myself). But it's not just the sewage treatment that has improved - the number of CSOs that discharge into the estuary has dropped dramatically, as has the number of times those that are left do discharge.
My point is (and perhaps you touched on this yourself by mentioning sensitivity) that there is a LOT less sewage in the estuary, during dry and wet weather - so there is another, new mystery factor here that needs explaining, because this didn't used to happen.
