North Leigh is a large mixed use development on the outskirts of Wigan.  The first phase has been put forward for a reserved matters planning approval.

Avie were tasked with undertaking the main highway design, drainage, overall drainage strategy and off-site highway works.

The initial drainage Strategy utilised storage pipes and existing pond.  Avie proposed to relocate the pone and enlarge it to provide increased attenuation which meant Phase 1 and Phase 2 did not require any over-sized pipework.  This was achieved by building a computer drainage model of the site which analysed rainfall intensities across the site which meant storage provision would be modelled more accurately.