4. What do the terms mean at the bottom of the SFD Graphic e.g. local area, neighbourhood, city?

The point at which the arrows drop down to the bottom of the graphic, gives a general indication of how far the excreta has travelled from the initial population centre. For example open defecation normally occurs in the ‘local area’ close to where people live, whereas untreated wastewater in open drains or sewers may flow out of the ‘local area’ through the ‘neighbourhood’ to the edge of a ‘city’.  The endpoint of the different arrows provides an indication of the likely location and scale of discharge of unsafely managed excreta to the environment.