Dave Liquorice wrote:

I was thinking of using the tank to water the small front garden.

Yes a small 250l water butt will do that but when it rains it will
fill in minets and that's from an ordinary domestic roof not a couple
of acres like yours. B-)

1l is 1mm over 1m2.

I think there was 100mm of rain in one day in our recent deluge,
so I guess a large tank might be necessary ...

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland