8.2.2 Describe the water supply system
The water supply system (Figure 8.3(a)) has to be fully described. This will allow hazards to be identified, and risks to be assessed and managed. In many cases, this information will be available and will only need reviewing to ensure that it is up to date, and checked for accuracy through site visits. A flow diagram that shows all the major elements of the water supply system (Figure 8.3(b)) should be drawn.
In the case of springs and wells, it is important to know where the rainfall is percolating into the ground to replenish the groundwater. This will highlight the area where protective measures (such as restrictions on, say, fertiliser or pesticide use) are needed so that contaminants are not carried by the rainwater into the groundwater.