downspout drainage on conservatory

[Trish9]

I have had problems with rain getting into conservatory in recent heavy rain. Consevatory company have removed blockage from downspout which appears to have resolved the current problem. However they have recommended an additional downspout which will drain onto my garden, which does slightly slope away from house. I am concerned that this may lead to flooding of my garden, or neighbour's. Also is this legal? Urgent replies would be very much appreciated as they are due to carry out the work in 4 days.

[The Builder]

This is going to be tricky, Trish. It's considered bad practice to let one roof slope discharge rainwater onto another roof.......... if it can be avoided. More downpipes is the best way around it.
But... if you do drain into the garden, then it will inevitably cause a bit of local flooding, or soggy groung at least.
The worst thing tough, is a concentration of water shooting straight into the ground is going to (eventually) affect the foundations. I've seen many corners of buildings starting to fall away because of foundation failure.
The simple answer is to drain into a gulley........ then pipe the gulley away to a soakaway of some kind.
It's difficult to say anymore without looking at it. :o)))

Otherwise, it would be against Building Regs........ so it would technically be illegal.

[The Builder]

Sorry about the typos ............ :o(

^^^ ground ^^^^ though

[AlBags]

Another option would be to improve the existing by swapping for a higher flow type (with downpipe)
Usually there is a gully that can be connected to.
Last resort is another downpipe turning underground connecting to a surface water drain .. or soakaway (as my mate above says!)
Al.

[Trish9]

Thank you, friends. Have cancelled the job and am rethinking the problem

[jackthehat]

Strictly speaking any rainwater butt ought to be positioned over its own gulley, but would it be possible for you to have a new downpipe fitted which discharges into a water-butt?
You could then draw off water at your own convenience.......