Overflow pipe????

[snooplax]

Hi,
I have what looks like a overflow pipe over the back door (on ground level), water is coming out at a fair old rate. What is this pipe? Why is it leaking? I thought overflow pipes came out of the roof!
Can you help?

I worked it out.
Thanks anyway

 

[stevetheplumber]

Hi,
I have what looks like a overflow pipe over the back door (on ground level), water is coming out at a fair old rate. What is this pipe? Why is it leaking? I thought overflow pipes came out of the roof!
Can you help?

I worked it out.
Thanks anyway

toilet overflow ?