name	unit	description
kSed	1/d	decay constant in sediment
kDif	m2/d	diffusion coefficient
hDif	m	diffusion distance
por	-	porosity of sediment
zSed	m	thickness of sediment layer
s_x	mol/mol	stoichiometric ratio s:x
flux_x	mol x/m2/d	flux of x across s/w interface
sWat	mol/m3	concentration of s in overlying water
