"David W.E. Roberts" wrote in message
...
We are is Suffolk and the levels always drop in the spring and summer.
We have a couple of water butts we use to top the pond up, and only use
tap
water in major drought times.
Evapouration will always reduce water levels, especially if it is sunny
and
breezy.
When levels are low I have been known to rush out in a downpour to start
siphoning water into the pond so that the new water running off the roof
into the water butts doesn't get lost :-)


Thanks for the responses guys (another 10mm or so lost in the 24 hrs - but
no panicking now). Interesting point about the rainwater though - I'm not
concerned about chlorine in tap water (as an aquarium owner I realise that
the concentrations going into my pond if I'm topping up will be negligible).
I did read once though that the real hazard of tap water is that it is good
food for algae - does anyone have any scientific proof for this ?