Water­weighs

Canal Boat - - Letters - TIM WHEEL­DON

YOUR BACK CABIN ( CB, Jan) refers to the ex­tra weight of wa­ter on a lock top gate “... es­pe­cially if it’s miles to the next lock”.

Surely, this is an old chest­nut? The weight of wa­ter de­pends on the head not the dis­tance. We have just drained down the Som­er­set Coal Canal for main­te­nance work and the weight of the wa­ter held back by our stop gate was the weight of the three feet of head – not the nine-mile pound of the Ken­net & Avon be­yond it.

It would be the same if the next lock was only six feet away. Wouldn’t it? Som­er­set Coal Canal

Com­pany, via email

Fair enough, this one’s dis­cussed in pubs every­where – the point is: don’t force the gates against the wa­ter with the boat – Ed.

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