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What size attenuation tank do you have/have planning for?


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Interested to hear what size attenuation tank you have. 

 

This is purely for rainwater/surface water in England. 

 

We have a roof size of about 200 sq m and have been advised that we will require a 16 cu m tank which seems rather excessive.

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Ha, our building inspector (who was a practical chap) told me I needed to provide a soakaway and I just laughed, explaining that on our solid yellow clay it would just fill up and stay full, currently all rain water from the site went into a ditch at the bottom of the garden so we just directed it there 👍. Result.

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57 minutes ago, Happy Valley said:

We have a roof size of about 200 sq m and have been advised that we will require a 16 cu m tank which seems rather excessive.


Based on what ..? And attenuation to where ..? A soakaway or to a storm drain ..??


Who’s done the calculation ..?

 

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55 minutes ago, PeterW said:


Based on what ..? And attenuation to where ..? A soakaway or to a storm drain ..??


Who’s done the calculation ..?

 

 

It goes to a sewer in the road, professional company did the calculation based on 1.10 l/s

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1 hour ago, Happy Valley said:

 

It goes to a sewer in the road, professional company did the calculation based on 1.10 l/s


Is that the limit from your waste water provider ..? And is that M10-D or M100-D..??

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20 hours ago, Happy Valley said:

Interested to hear what size attenuation tank you have. ...

 

We have a water garden for each side of the roof (same area as yours) - each the maximum size of cattle trough (no idea what size that is) , the overflow of which goes into a sand bed filter, and then into a pond. That pond spills over into a bank of trees and a thirsty fence line : Alder, holly, blackthorn, privet, very old oak trees. Anything else trickles away into Great Crested Newt Central. 

 

The BCO took one look at it, sucked his teeth, grinned and put a tick in a box.

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