Nutrient concentration change in implementation

[val-ismaili]

Currently, nutrient concentration statistics are inputted as values in g/L. One of the key purposes of pysimdeum discharge simulation is to be able to simulate and measure change in nutrient concentration based on enduse behaviour changes.

Example:
Conceptually, it makes sense that a user will use the same amount of soap when washing their hands at a BathroomTap regardless of the amount of water consumed, and then discharged. By providing nutrient stats in units g/L, this implies that the total nutrients deposited in the discharge flow will vary at every use i.e. the actual concentration will stay constant. However, we would want to provide total volume of nutrients per use i.e. g/use. This would then be used to calculate the g/L concentration for that specific consumption - discharge event.

The current architecture of the nutrient concentration object is still applicable. However, there is a need to alter the calculation by:

1. Input stats g/L --> g/use
2. Identify unique discharge events
3. Distribute nutrients across that usage event --> thereby calculating concentration in g/L