From memory there are two issues with not filling ponds fully. 1. Water will evaporate too quickly/get too hot and potentially precipitate lithium.2. If it rains it dilutes the concentration more as the volume is lower e.g. 100mm rain in 1m deep pond =10% dilution if pond was 500mm this would be 20%.
not sure if this was raised in announcement or on here previously, or both but definitely been discussed before
The View from Space, page-88
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