Twin Water Tanks under forward bunks?

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My Bavaria 47 has twin water tanks under the forward bunks, joined by a 15mm hose. This makes filling a bit of a chore while the levels settle. It also occoured to me that if these (total of 340 litre) tanks are half full, then I have the weight of a person slowly draining to the lower side when heeled over.

Is this a concern, and if so, would a valve be a idea?
 

johnphilip

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We have the same setup, albeit under the saloon bunks. The cross connecting hose has a valve on it but it's always left open and I can't say I've noticed any problem.
We have the same set up but no valve.I always wonder about the effect and would like to add a valve,but access would be under a screwed down section of floor unless I have a solenoid valve.
 

NormanS

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To me it would seem a basic necessity to have a valve or valves to prevent water free-flowing from one side to the other. My own boat has port and starboard fuel tanks and water tanks. Each tank has its own isolating valve, so I know which tank I am using. If I want to cross-level, I open both valves. That seems pretty straight forward.
 

Tranona

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If there is an independent pick up from each with a changeover valve then would make sense to have an isolating valve between the two.
 

johnalison

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You have the opportunity of isolating water in the uphill tank by draining down and closing a valve before tacking. Whether this makes any difference in practice I don't know.
 
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