Figure 23.1 shows a typical rear view of a house with the external pipework on view. This figure shows a typical ‘old fashioned’ system which has both a hopperhead to take the washbasin discharge and a separate soil and ventilation pipe (SVP) to take the toilet (WC) discharge. Nowadays, hopperheads should not be used and all the waste should be connected to the SVP. As rainwater drainage has already been covered in other sections, the only major item of above ground level drainage is the foul system (i.e. drainage from the WC and the like).