"Malcolm Nixon" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] : On Thu, 11 Jan 2007 09:44:18 +0000, Adrian Stott <[EMAIL PROTECTED]> : wrote: : : : >It was not the rule during the waterways' freight days. It was : >introduced later as a convenience for the navigation authorities (and : >an inconvenience for boaters). : > : : Didn't it also have something to do with poorly maintained and leaking : gates. So the idea was to close both sets - as one set may be more : watertight than the other ???>
The only lock I know of that will completely empty or fill with both gates closed is Napton top and that empties with the top gates closed, so if you leave the top open you are draining the pound. Most locks will sit around half full/empty, which means the water is running out as fast as its running in and saving nothing. -- Brian Ancient Order of Sewer Ants Visit this site and help save our waterways http://www.savethewaterways.org.uk/
