Total Balance
Assuming that the volume of the water body remains constant over time, the processes described above (inflow, settling, outflow) can be combined into the following mass balance equation for a well-mixed water body:
8:3.2.1
where is the volume of the system (m HO), is the concentration of nutrient in the system (kg/m HO), is the length of the time step (1 day), is the amount of nutrient entering the water body during the day (kg/day), is the rate of water flow exiting the water body (m HO/day), is the apparent settling velocity (m/day), and is the area of the sediment-water interface (m).
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