Open slurry lagoon

Have a steel tower and an underground concrete tank uncovered. If I have to cover the concrete tank I'll likely have to redo it and may stick a shed on top as part of development. Dunno how much it'll cost to cover the tower but see it as a pointless exercise really given the length of time it's full to the freeboard is fairly short

Is the tower near its operational end anyway? What kind of lifetime are they expected to have? Took one down here that was about 30 years old and was showing its age.. They're neat and clean though..

Are you sure? A floating cover would be a pretty simple solution for a lagoon, but the thinking behind this was to stop ammonia loss, not to keep out water, and thought the brainwave had been parked..

Does this new requirement include dung heaps as such?

or just slurry?

25 to 30 years I think is the run of them, I patched it up last year, resealed all the joints but it is shook in places, in all likelihood I'll have to replace it soon.

I've installed a sort of natural lagoon below our own clamped fym storage. Seem to work well cos the water in the drain below is always crystal clear, have recently installed a new septic tank nearby with emergency overflow piping feeding into the same lagoon. The natural reed/bull rush cover on it makes a nice wildlife habitat too:)