On Fri, 26 Jul 2013 16:22:59 +0100, Janet wrote:

In article ,
says...

On Fri, 26 Jul 2013 12:17:59 +0100, Another John
wrote:

In article ,
Stephen Wolstenholme wrote:

It's years since I needed to store a lot of rainwater. After trying
water butts I decided to dig a pond. The house roof drainage was
redirected to keep the pond full. Water was taken from the pond as
needed from a constantly running waterfall pump.

Nice. How bigs the pond, please?

John

It was about 4000 litres.

What happened in winter to the overflow, when roof drainage continued
to fill the pond and you didn't need to water the garden?

Janet.

The overflow ran into the main rain drain as the roof drainage once
did. Effectively the roof drainage was the same as ever with a pond
along the flow.

Steve

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