Where does the water from the downpipe go? I'd want to know that before I put any more water in it. Does it back up? If so it won't take any more.
It could well be a soakaway that quite possibly doesn't do much anyway, they don't last forever.
It might be connected into the foul drain. 'They' don't really like you doing that anyway, unless authorised it's considered a misconnection, and they really wouldn't like anyone draining a garden into it as well - in a flood somebody could end up with sewage in the house.
He might get away with it but on the other hand if he's unlucky he could end up 'pressurising' his downstairs bog, introducing damp, or washing away the foundation.
I certainly wouldn't give him advice, unless it's "get somebody who knows what they're doing".
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Tapping into a gutter down pipe 
Tapping into a gutter down pipe 
