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4.
The equilibrium size and settling velocity of Macroflocs are determined by the turbulent shear-stress and the overall concentration of suspended particulate Perindopril (SPM).
5.
The relative concentrations of microflocs and Macroflocs are determined only by the SPM concentration.
6.
Differences in bond strengths between particles due to variations in mineralogy, estuarine water salinity and biological content are small compared with the effects of turbulent shear-stress and SPM concentration and are therefore ignored.
7.
The timescales on which floc formation and break-up operate are sufficiently small that, in a tidal estuarine flow, the floc population can be treated as being in quasi-equilibrium, with floc formation almost balanced by break-up, so that a fully time-dependent approach is not necessary.
On this basis, MD07 devised a formulation for the mass settling flux (MSF) comprising seven equations obtained by standard regression analysis applied to the data-set, containing 27 empirical (mostly dimensional) fitting coefficients. The MSF is expressed as a function of SPM concentration and turbulent shear-stress.