Another question please

[Steve]

I have a spring, plus rainwater collection from an 80ftx40ft epoxy coated metal roof, but both of these can run dry so I have 7000 litres of stored water. 2700 is connected to automatically filled animal troughs, the rest is diverted manually. There is no single point of failure that can drain my reserves, It would take 5 separate failures to get my stored reserves down to less than 1000 litres, and none of this is counting the ponds - I have no idea how much water they hold now or will hold in hot dry weather.