HYDROLOGICAL CHARACTERISTICS OF TAMPA BAY TRIBiTTARIES 



STATION 34 



169 



40,000- 



20,000- 



0- 



20,0-| 



10 0- 



STATION 33 



RIVER DISCHARGE 



0-1- _ 



....I. .ml 



IPITATION m 



 ■.l.llllll 



PRECIPITATION 



30 0- 



o . 



" 20 OH 



o 10 00 







20.0 



10.0- 



WATER TEMPERATURE 



 K i 



SALINITY 



20.0 

 10.0 



en 



40 

 2 

 



INORGANIC PO4 P 

 TOTAL PO4 P ^ 

 ^q NO3 NOj N 



P fe 



0.I2H COPPER 

 0.08- 

 0,04- 



I I I I I I I I I I I I I I I 

 OND J FMAMJJ ASOND 

 1958 1959 



SURFACE — I 

 BOTTOM — I 



FiGUEE 5. — River discharge, precipitation, and hydrologieal properties of Little Manatee River, Florida, October 1958- 



December 1959. 



I. .ml 



 ■.■.mill 



I 



i fe L fe £ k _ 



i   

 «. E 



concentrations of organic phosphorus were ob- 

 served in the Ahitia Ri\'er. High concentrations 

 of inorganic pliospliate-pliospliorus in May 

 were accompanied by higli vakies of or- 

 ganic pliospliorus (10.2-16.8 /ig.at./l.). From 

 May through October, with the exception of two 

 vahies (0.0 and 0.2 ^g.at./l.), the concentrations 

 of organic phosphorus remained high. 



Concentrations of nitrate-nitrite nitrogen in all 

 rivers varied from 0.1 to 13.7 jug.at./l. Values for 

 the Hillsborough and Alatia were 2 to 10 times 

 higher than those for the Little Manatee and 

 Manatee Rivers. The seasonal distribution of 

 nitrate-nitrite nitrogen concentrations was very 

 irregular at all stations (figs. 3, 4, 5, and 6). The 

 highest concentrations of nitrate-nitrite nitrogen 



were recorded in the Hillsborough River, at sta- 

 tion 29 (table 2). The Alafia and Little Manatee 

 Rivers showed higher \alues at upstream than at 

 downstream stations. 



Concentrations of total dissolved copper in all 

 rivers varied from 0.00 to 0.22 /^g.at./l. The 

 monthly co])per values were very irregular at all 

 stations. The Little Manatee River showed the 

 highest average copper level for the investigation 

 period (table 2). The highest values (0.22 and 

 0.16 /xg.at./l.) were observed at station 31 in the 

 Alafia River during December when copper values 

 for five other stations were low. Except in the 

 case of the Alafia River, slightly higher concen- 

 trations of copper were observed at the upstream 

 stations (table 2). 



