Apologies, I have had permission to directly connect all of our drainage, unattenuated to the public sewer (which makes a change!). I am simply sizing and providing flow rates for the development and may have to spec basement pumps where required. My question is should an allowance for the...
I am trying to find some guidance with regard to calculating surface water run off from a collection of mult storey buildings. Building regs give guidance on roof pitch but not in relation to the catchment created by the building elevation.
Any guidance would be appreciated.
Many thanks
