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Yes, it is irritating to see rubbish hurled back into the river after one spends the day carefully removing it, but that way of thinking leads to defeatism as it would be all to easy to think 'why bother'. However if one is pragmatic one needs to remember that every bit of rubbish removed is a piece of rubbish no longer in the river. Obvious, maybe, but if no-one at all was removing it, what we daily complain about would be many magnitudes worse.
It's annoying that Health and Safety rears it's head and there are certain areas that one is not allowed access to, e.g. the sections by the back of Nettos near the car park. They are sadly too dangerous, if one was to lose one's footing in the current one could be swept under the car park and rescue would be difficult.
Actually the Dour was surprisingly not too bad for rubbish in it's upper stretches. The winter storms had swept a lot of the crap downstream and it had built up by the underpass grille as Paul noted. I am not certain who cleaned out the grille this week, but I can only assume it was DDC. It certainly wouldn't have been the WCCP and I doubt if the EA had the manpower or specialised equiment to do so. It must have required a long crane with a cage to access that area, very difficult.
I don't think all the rubbish is deliberately dumped, though a great deal of it certainly is. Some blows in from elsewhere - the Dour being the lowest point in the valley will naturally collect rubbish blowing down the hills. On the other hand some of the bikes we've pulled out have been in really good condition implying they had been stolen rather than dumped by the owner.
It's not all bad stuff pulled out. I've found a nice Victorian clay pipe bowl at Pencester and one of my colleagues found a 1930 halfpenny at Barton Path. Last week I found a 1898 lemonade bottle from a Dover glass works, but I did not keep it as it was sadly not intact.