Happy Valley Posted March 12, 2022 Share Posted March 12, 2022 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. Link to comment Share on other sites More sharing options...
joe90 Posted March 12, 2022 Share Posted March 12, 2022 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. Link to comment Share on other sites More sharing options...
PeterW Posted March 12, 2022 Share Posted March 12, 2022 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 ..? Link to comment Share on other sites More sharing options...
nod Posted March 12, 2022 Share Posted March 12, 2022 We are pretty much the same as Joe on our next one Boulder clay We will run 75 meters to a dyke It would have cost more to put a tank in Link to comment Share on other sites More sharing options...
Happy Valley Posted March 12, 2022 Author Share Posted March 12, 2022 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 Link to comment Share on other sites More sharing options...
BadgerBadger Posted March 12, 2022 Share Posted March 12, 2022 Our roof area is slightly larger, and we're looking at 19m3... so broadly comparable, but big! Did you do an infiltration test? Link to comment Share on other sites More sharing options...
PeterW Posted March 12, 2022 Share Posted March 12, 2022 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..?? Link to comment Share on other sites More sharing options...
Happy Valley Posted March 13, 2022 Author Share Posted March 13, 2022 17 hours ago, BadgerBadger said: Our roof area is slightly larger, and we're looking at 19m3... so broadly comparable, but big! Did you do an infiltration test? OK so not an unusual size. No infiltration test has been carried out. Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 13, 2022 Share Posted March 13, 2022 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. 2 Link to comment Share on other sites More sharing options...
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