We refined the brief and recommended we provide compliant designs, together with cut & fill analysis to ensure the solution is cost effective whilst minimising earthwork volumes. There were two distinct phases to this: a preliminary design and initial assessment of cut & fill volumes, and subsequently a refined, detailed design ensuring earthworks volumes were broadly balanced. In addition, the access road design included for horizontal and vertical geometric alignment, within acceptable design parameters, including curve radii and gradients suitable for a design speed of 20mph. We carried out 3D corridor modelling and prepared all design drawings. This work also included vehicle tracking analysis and incorporated localised road widening to ensure the design catered for public service vehicles, required to satisfy local planning guidance. We analysed forward visibility and junction visibility splays to ensure that drivers have unobstructed visibility of the road for the required stopping sight distances appropriate to the design speed. 

We delivered foul and surface water drainage designs, including full network layouts and hydraulic calculations. The surface water system comprised a piped network discharging at a restricted rate to a watercourse via a flow-control device and a detention basin, designed in Causeway Flow.

A particular challenge arose from the fixed position of the detention basin, which complicated plot-level optimisation and earthworks balancing. Through careful modelling and iteration, we developed a workable solution that satisfied both engineering and planning constraints.