I4J '•III lilti OiltU'i* 



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jrNIMIIlSOIIDI 

 I9S4 ES 



Figure 9. — River discharge, precipitation, and hydro- 

 logical properties at station 8, Peace River, Fla., Jan- 

 uary 1964 to January 1965. (Open bars = surface; solid 

 bars=bottom.) 



Even though anaerobic conditions were ap- 

 proached several times, no complete deoxygena- 

 tion was detected. In 80 percent of the observa- 

 tions, oxygen saturation exceeded 50 percent. 

 Values below 50 percent in one-fifth of the obser- 

 vations indicated that oxygen depletion occurred 

 in the rivers. The occurrence of 75 percent of 

 these values from April through September 

 suggests that the depletion was seasonal. 



Differences between surface and bottom values 

 of oxygen were less than 1 ml. per liter in 84 

 percent of the observations. The similarity for 

 most of the sets of observations reflects the 

 capacity of the river system to maintain relatively 

 high subsurface oxygen concentrations. 



Irregularities in tiie vertical distribution of 

 oxygen in periods of water stratification were 

 associated with the presence of hydrogen sulfide 

 near the bottom. O.xygen was almost exhausted 



470 



I. 



„][ 



cB [l J I ri .^ Pi n a lI 



,„icm cm 



l„, Clitfi»l<i 



aa laaaaan 



la a™ 



a 



101 , •"If I 



„jn ajcurk [h CM CM [M cm rm - 



99 

 iDO -J '•'" ' 



,g J (=m cM 



lis-, t»»Mr 



[=ta nm c:m 



00 -< 



CI. J 



a_ CW i=v_ 



J.jJl I I 



a_ J _- 



I F ■ I M I I I s 



I9S4 ES 



» I 



Figure 10. — River discharge, precipitation, and hydro- 

 logical properties at station 9, Caloosahatchee River, 

 Fla., January 1964 to January 196.5. (Open bars = sur- 

 face; solid bars = bottom.) 



near the bottom in the Hillsborough River 

 (station 1) in April, Juno, August, and November 

 (fig. 2). 



TOTAL PHOSPHORUS 



Concentrations of total phosphorus increased 

 from downstream to upstream stations in the 

 tributaries of Charlotte Harbor; Tampa Bay 

 tributaries were samj)led only at the mouths of 

 rivers. 



Quantities of total phosphorus were highest in 

 the Peace River (station 8) and second highest in 

 the Alafia River. Mean values at the surface and 

 bottom in the Peace River (station 8) were 35.1 

 and 33.3 Mg-at. per liter, and in the Alafia River 

 (station 2) 27.5 jug.at. per liter, and 28.7 Mg-at. 

 per liter. At the remaining stations, the values for 

 surface and bottom ranged from 4.2 to 23.5 

 /ig.at. per liter. Values were lowest at the upstream 

 station (10) in the Caloosahatchee River. 



U.S. FISH AND WILDLIFE SERVICE 



