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Old 20 February 2007, 09:15   #1
nik
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Brown water

I was on the fishbourne-portsmouth ferry on sunday, and about halfway across, near the shipping lane, I saw large patches of brown water.
I have seen the same thing on other days.
Is this sewage? if not, does anyone have any ideas what it could be.

Nick
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Old 21 February 2007, 20:15   #2
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Were you standing near the outlet valve of the ferry's holding tank?
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Old 21 February 2007, 21:32   #3
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It could possibly be an algae bloom of some sort, especially if it was a reddish-brown... The old "sniff test" can go a long way in determining the source!
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Old 22 February 2007, 04:15   #4
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Quote:
It could possibly be an algae bloom of some sort, especially if it was a reddish-brown... The old "sniff test" can go a long way in determining the source!
It could be. Its a bit hard to sniff the water from 50 feet up.
I would have thought algal bloom would be a summer thing.
At a first glance it looks as if you are running into shallow water.
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Old 22 February 2007, 06:22   #5
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Hi Nik
Brown patches are not uncommon in the solent.
I used to watch out for them when yot racing. They usually occur when the tide is changing and I think they are caused by the change of flow stiring up the bottom.
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Old 22 February 2007, 14:38   #6
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Thanks, that seems very plausible.
There were several patches, each one being quite large, (a football pitch or two)
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Old 22 February 2007, 18:17   #7
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it's just sediment being kicked up, in the mersey where the tide is normally around 2-5kts where we sail the water is always brown, it only goes clear at slacks.
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