The additional roof area has the potential to create run-off. A design was put forward to counter this problem.
Run-Off is when water falls on a hard surface, and does not soak in to the ground. It then will “run-off” . . . but where will it go. Perhaps it is caused flooding elsewhere. This is the purpose of a Surface Water Drainage Strategy. It sets out a method for dealing with Run-Off
The report was prepared on a quick turnaround (5 working days) and submitted for review. Pending some minor amendments at request of the client the report was submitted to Chiltern District Council for Scrutiny.
Are current design avoids the use of soak-away drainage although is does recommend for some attenuation.