#' eta_parm Function
#' This function calculates the single particle/collector removal efficiency [Equation 6 from Tobiason and O'Melia (1988)]
#' @param Kx Defaults to a value of 0.02 cm/s
#' @param GRAD Defaults to a value of 0.0007
#' @param POR Defaults to a value of 0.21. The value of 0.21 is the average for medium sand as reported by Johnson (1967)
#' @param K_units Units of hydraulic conductivity. Defaults to cm/s but also accepts ft/day. Units should be surrounded
#' by quotation marks to ensure it is treated as a string of text.
#' @param TEMP Temperature in units of °C. Defaults to a value of 25°C
#' @param DIA_SUSP Diameter of the suspended solids in units of cm
#' @param DIA_SOIL Diameter of the soil particles in units of cm
#' @param PART_DENS Density of the suspended particle in units of g/cm³
#' @keywords filtration, Removal Efficiency
#' @export
#' @examples
#' eta_parm()
#' [1] 11.59751
eta_parm <- function(Kx = 0.02, # cm/s
GRAD = 0.0007, # cm/cm
POR = 0.21, # cm³/cm³
K_units = "cm/s",
TEMP = 25, # °C
DIA_SUSP = 1e-4, # cm
DIA_SOIL = 0.053, # cm
PART_DENS = 2.64 # g/cm³
){
val <- 4 * As_parm(POR = POR)^(1/3) *
Npe_parm(Kx = Kx, # cm/s
GRAD = GRAD, # cm/cm
POR = POR, # cm³/cm³
K_units = K_units,
TEMP = TEMP, # °C
DIA_SUSP = DIA_SUSP, # cm
DIA_SOIL = DIA_SOIL)^(-2 / 3) + # cm
As_parm(POR = POR) *
NLo_parm(Kx = Kx, # cm/s
GRAD = GRAD, # cm/cm
POR = POR, # cm³/cm³
K_units = K_units,
TEMP = TEMP, # °C
DIA_SUSP = DIA_SUSP)^(1 / 8) * # cm
Nr_parm(DIA_SUSP = DIA_SUSP, # cm
DIA_SOIL = DIA_SOIL)^(15/8) +
3.38 * 10^-3 * As_parm(POR = POR) *
Ng_parm(Kx = Kx, # cm/s
GRAD = GRAD, # cm/cm
POR = POR, # cm³/cm³
K_units = K_units,
TEMP = TEMP, # °C
DIA_SUSP = DIA_SUSP, # cm
DIA_SOIL = DIA_SOIL, # cm
PART_DENS = PART_DENS)^1.2 * # g/cm³
Nr_parm(DIA_SUSP = DIA_SUSP, # cm
DIA_SOIL = DIA_SOIL)^-0.4
return(val)
}
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