Martin Clark <[EMAIL PROTECTED]> wrote: >Adrian Stott wrote... > >"Ralph Rawlinson" <[EMAIL PROTECTED]> wrote: >>> Locks 1 and 2, originally next to the junction with the River Irwell, >>>have been replaced >>>by a single deep lock situated to the west of the railway further away >>>from the river. >> >>(sort of XP from URW) >> >Since you have copied and pasted your reply to me in URW, I shall copy >and paste my reply to you, for the benefit of any readers here who don't >receive URW...
Ditto (sort of). One answer is side ponds on the deep locks. If a lock with no side ponds requires W m3 of water to be filled, the same lock with S side ponds requires W x (1 - (S/S+2)) m3. e.g. if there is one side pond, the lockage water required is reduced by 1/3; with two, by 1/2. So if the double-depth lock is equipped with two side ponds, no backpumping is required, as its use will consume the same amount of water as the standard-depth lock (with no side ponds) above it.. Adrian Adrian Stott 07956-299966
