the goyt used to be full of streamer weed from otterspool down, not sure about higher, it vanished around 1998 if memory serves not long after the crayfish infestation, around this time there numbers were terrible, whether they were to blame or not is another matter but if streamer weed was successfully replanted it can and does withstand floods, i suppose depending on the flood you might lose some but you have to keep on top of it, once it is established it should be fine but it needs lots of light to flourish
cheers
jerry

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The Barbel Society Lancashire Regional Organiser