The Boating Lake can only be full for a few days at a time.
This is due to algae which form on the concrete bottom very quickly in warm weather making it very slippery.
The only way to remove the algae is to drain the lake and to let it dry completely.
As the Boating Lake draws its water from the beck, it cannot be done during or just after rain, as the silt from the beck would then enter the lake.
Good weather is required for several days in a row in order to fill the lake, keep it safe when in use, and for it to be maintained.