Late-August Chlorophyll 
Gl = [RI*SI<n] Ju|y [RI*SITI] Aug !l 
Rl = Retention Index = (Ret time)/(Ave ret time) 
SI = Sunlight Index = Min sun/Ave min sun 
Tl = Temperature index = Water temp/Ave water temp 
II = Inflow Index = Spring inflow—January through May 
Figure 6 Late-August Phytoplankton Chlorophyll-a Growth Index 
for the Lower Tidal-fresh Potomac River. 
124 
