NO A A PROFESSIONAL PAPER 11 



Dissolved Oxygen (ml/I) 



APRIL 



DC D 



7 17 23 33 34 35 36 37 38 39 „ 17 17 23 33 34 35 36 37 38 39 



FIGURE 2-21.— April and May 1*^76 dissolved oxygen (ml/1) sections. 



40 



