What does a Composite Sample represent?

A composite sample represents a combination of multiple grab samples taken from the same point over a specific period, rather than a singular or static point-in-time measurement. The primary purpose of a composite sample is to provide a more representative overview of the water quality by averaging the variations that may occur during the sampling duration.

For example, if water is sampled multiple times throughout the day from the same location, these individual grab samples can be combined to form a composite sample which might reflect fluctuations in water quality due to changes in flow, temperature, or contamination events. This is particularly beneficial in identifying consistent trends or variations rather than relying on a single snapshot that might not represent typical conditions.

By choosing to use a composite sample, professionals can better assess the overall quality of water by minimizing the impact of transient events or anomalies captured in an isolated grab sample. Thus, this method provides a clearer picture of the water's characteristics over time at that specific location.