On Sun, May 31, 2009 at 8:47 PM, Brian on Harnser <[email protected]> wrote: > But the way I see it is that the maximum you can take out of a side > pound without replacing it is two lock fulls. A boat going down does it > in the wrong order so the lock full is lost and then a lock full is > taken out to fill the lock he is going into, this is followed by a boat > coming up who also takes a lock full out of the same pound. If another > boat follows him and tries to do the same thing he can't because he has > to empty the lock in front which replaces the water lost. > If the pounds are not on weir you can't even waste a lock full going > down because it would stay in the pound.
The side pounds are a replacement for a pound between locks. They work in exactly the same way as though it was a normal lock flight but you don't actually boat on the pound. When the locks are level, the side pound is also at the same level. To ensure there is enough depth over the cill the pounds are kept well up. Just like any lock flight with short pounds between locks, you should work ahead going down (i.e. start filling the next lock down before emptying the current lock), and vice versa going up (i.e. start filling the current lock before emptying the next one up). This avoids waste of water usually overflowing on the bywash. Because there isn't usually a continous flow down the bywashes into the next pound to keep it topped up, any wastage isn't replaced. The red paddle is the top paddle on the current lock, the white is the bottom paddle on the next, therefore red before white, and you'll be alright. But as already said, if the water doesn't get lost it doesn't really matter which order you do them in. The general rule is just to stop water from being lost in the first place. I have in the past lifted white before red just like I often do this on lock flights with low pounds also, as it's not really going to matter - no water is lost. Cheers, Mike -- Michael Askin http://shoestring_DOT_zapto_DOT_org/
