Drainage Impact Assessment - Renfrewshire Council

6.3 Pluvial Flooding
There are two instances when pluvial flooding may be a problem;
During the initial soil strip, when rainwater has a reduced ability to percolate
through the exposed sub soil. At present the site is covered with roof or
hardstanding, ie impermeable and as such we do not consider this condition to
be a concern.
Upon completion of the development when the surface water can drain across
impermeable surfaces without being contained on site. The surface water system
will be designed to store all rainwater on site.
6.4 Site Access and Egress
As the site will be designed for a 1:200 year plus climate change storm, stored below
ground, and fluvial flooding is not considered to be a risk, there is no risk to safe access
and egress.
7.0 Conclusions
The proposed drainage design satisfies all elements of the current guidelines with
regards to impacting on the existing sewers network and surrounding areas.
Prepared By ………………………………. Checked By ……………………………………….
Jim sharp Sandy Porter
BSc (Hons) CEng MICE BSc CEng MICE