If your problem is that you do not have enough water, your aim
must be to conserve every single drop that falls on your property.
For a start, water butts at the bottom of drainpipes can
collect considerable quantities. Large areas of roof are excellent
catchment areas. Rain butts can be put at the end of every building,
shed or greenhouse. We have several old galvanised water-
carriers that push along on wheels. Although our problem is often
too much water, we find them invaluable in the summer.
Really large water storage systems need to be well protected from wandering
children - to protect the children. Also from passing
geese and other pollutants - to protect the water. Although
the ecology of a natural pond copes happily with the droppings of
a few water-birds, an unmanaged water-tank does not. Very
quickly the most unpleasant bugs start to develop in its depths.