The drainage plan shows the layout of pipes and manholes (FMs) for draining a science building addition. Soil pipes from the building drop down into a new manhole (FM3). A 110mm cast iron soil pipe runs along the underside of the first floor and into FM3. Rainwater pipes also drain into FM3. From FM3, foul water is drained through existing pipes. New manholes will be dug to connect to the existing drainage system and match the depths of existing falls. The surrounding area will be tarmaced.