Blue Boar Lane, Sprowston

JMS designed and detailed the highway and drainage infrastructure to serve a development of 1233 proposed houses for a consortium of three of the region’s largest house builders.

Highway access was taken from an existing roundabout and from a new ghost right turn lane. On-site highway infrastructure includes two new roundabouts and the construction of culverts to cross an existing watercourse. The ground conditions of low strength silts presented a particular challenge that was overcome by utilising in-situ ground stabilisation to eliminate the requirement for extensive muck away and for replacement material to be imported.

The development was also crossed by a foul water rising main forming part of the Water Authorities’ strategic regional assets that was diverted through the development area under a Section 185 Agreement. The surface water drainage strategy was designed to utilise swales and basins to replicate the drainage regime of the site pre-development.