Calculate the dynamic concentration in a river stretch

based on mixed reactor approach

Usage

mixed_reactor_C(
  Q_river,
  Ci_river,
  Ci_storm,
  coeff_runoff,
  q_rain,
  t_rain,
  Area,
  V_river
)

Q_river: Average flow of the river in m³/s
Ci_river: Background concentration for substance i. Concentration unit must fit to Ci_threshold and Ci_storm.
Ci_storm: Concentration in stormwater run-off for substance i. Concentration unit must fit to Ci_threshold and Ci_river.
coeff_runoff: runoff coefficient of connected impervious area
q_rain: Amount of rain amount in L/(s*ha)
t_rain: duration of the rain in seconds
Area: impervious, connected area in ha
V_river: volume of the river in m³

dynamic concentration after time t in the unit of the input concentrations