about maximum packing fraction
Dear experts: When I use sediment scour model. We need set up about sediment parameter(ex:diameter, density, critical shield number, and maximum packing fraction et al.). I have read user's manual, but I still do not understand what is maximum packing fraction. What will happen about result If I set 0 or 1. Thanks your help!! 
Maximum packing fraction is the fraction (volume of all sediment species/open volume in cell) of sediment at which the cell becomes 'packed' and the drag function in the cell goes to infinity (no flow). It is equal to (1  porosity). 0.64 is the default and has been analytically demonstrated for uniformlysized randomlypacked spheres. Sand is typically of porosity 0.3 to 0.45, so max packing fraction of 0.55  0.7.

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