fw                             # Bed friction factor
cf                             # Friction coefficient flow
gammax                         # Maximum ratio wave height to water depth
beta                           # Breaker slope coefficient in roller model
wetslp                         # Critical avalanching slope under water (dz/dx and dz/dy)
alpha                          # Wave dissipation coefficient in Roelvink formulation
facSk                          # Calibration factor time averaged flows due to wave skewness
facAs                          # Calibration factor time averaged flows due to wave asymmetry
gamma                          # Breaker parameter in Baldock or Roelvink formulation