What is the term for water samples collected at regular intervals and combined in equal volume with each other?

The correct term for water samples collected at regular intervals and combined in equal volumes is known as time composite samples. This method is particularly useful in monitoring water quality over a specific period because it allows for the examination of variations in contaminant levels or characteristics that may occur throughout that timeframe.

By taking samples at defined intervals, time composite sampling captures a more representative picture of the entire period's conditions rather than just a snapshot at a single moment, which is the case with grab samples. This comprehensive approach helps in identifying any trends or patterns that might otherwise be missed if only sporadic samples were collected.

While composite samples might encompass a similar idea, they do not necessarily imply that the samples are collected at regular time intervals, as they can refer to samples taken from various locations or times without the emphasis on timing. Sequential samples typically suggest a strictly ordered collection of samples, but not specifically combined in equal volumes over time intervals like time composite sampling does.