Stuart Crisp, business development director for the British Precast Drainage Association, gives his top tips for specifying manhole systems, and outlines the benefits of opting for a precast solution Manholes provide access for the inspection and maintenance of buried wastewater drainage systems. In most situations, they are built at the point where one pipeline connects to another, where a pipeline changes size, direction or gradient and at a spacing that enables equipment to be used effectively. Here we present some top tips for specifying manhole systems. 1. Consider a precast concrete manhole solution The construction of a manhole base in-situ using traditional techniques can take up to 40 hours and can often involve personnel working in wet and difficult confined spaces. Off-site manufactured precast concrete manhole base systems offer some big advantages compared to traditional in-situ solutions: they are safer, quicker and cheaper to install, are watertight, of consistently high quality, create less waste on site and have a lower carbon footprint. In fact, construction time from precast base to cover slab can be as little as one hour. A precast concrete manhole base syste...