In message , The Natural Philosopher
writes

At this point you just know its fairy dust




Not saying that this system doesn't have other issues, but as I see it
this single statement is not necessarily wrong. Sure if you are just
moving water from one lake to another it is, but this is a tidal situation.

If you pump water from the sea to the lagoon when the sea is six inches
below the lagoon, and let it out when the sea is six feet below the
lagoon, would this not generate more energy than consumed? (OK the six
inches and six feet might not be the right numbers because of efficiency
losses but in principle?)


well you are then taking some energy from the tides and you MIGHT just
get a shade more out - but 6 feet is an abominable head to get any
efficiency at all.

Its far from a perpetual motion machine since you are relying on a
dropping sea level to increase the head.

My reading of the Halcyon puff indicated they would save cost and
silting by not having a lagoon.

Pumping must be from some other scheme.




--
Tim Lamb