Surface Water Drainage Design for a Listed House Extension

Overview

An extension to a listed residential property required a surface water drainage scheme with infiltration testing to confirm soakaway viability – with the listed building status adding planning sensitivity throughout the process.

The Challenge

The property’s listed status required careful planning coordination. Ground conditions needed to be confirmed before drainage could be designed, and the original rainwater harvesting provision had been removed from the scheme.

The WCI Solution

WCI provided guidance on BRE Digest 365 infiltration testing, calculated infiltration rates for soakaway sizing, and designed a drainage scheme for discharge to ground. Where conditions proved unviable, discharge to the adjacent rhyne was documented as an alternative, subject to IDB approval.

The Outcome

A viable surface water drainage scheme was designed with clear contingency provisions.

To discuss your installation or groundworks project, contact WCI today.