10 15 20 25 



SOLIDS CONCENTRATION, LB/CU FT 



Figure 5. Solids loading curve 



generate two curves (Tables 16-18) , the concentration profile curve and the 

 supernatant suspended solids curve (Figures 6-11). The concentration profile 

 curve, which plots the depth below the surface (feet) versus percent of ini- 

 tial concentration, shows that the suspended solids concentrations decrease 

 with time and increase at deeper ponding depths (1, 2, and 3 ft) at the weir. 

 The supernatant suspended solids curves derived from the concentration profile 

 curves compare the effect of retention time on supernatant suspended solids at 

 1-, 2-, and 3-ft ponding depths. This curve shows that increasing the 



17 



