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Total Flow
Represents the annual volume of water in cubic metres which passes the gauging station. This is a volume measurement and includes all forms of water which have run over the surface or traveled through the ground to enter the watercourse above the gauging site.
Base Flow
With a continuous record of flow, it is possible to separate the total volume of flow into the portions which represents surface runoff and ground water inputs. The flow volume, which reflects ground water inputs, is typically defined as the base flow of the watercourse.
Mean Daily Flow
The mean daily flow is defined as the median flow rate throughout each 24 hour period.
Mean Monthly Flow
The mean monthly flow is expressed as the average of the mean daily flows within one month period.
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