Thank goodness for those pictures, I'm not the only one with a rubber duck marginal interest

In that last photo I can see an emergency pond replenishment bottle, highly commendable if a tad small

seriously though, my pond level has dropped quite a bit over the last 3 days as it hasn't rained (!), been warm and breezy plus I think the pondside plants draw a lot of water through their roots in the felt pondliner cover.