Number 



Page 



47 Local drainage density vs. trophic state index Ill 



48 Inorganic nitrogen:phosphorus ratios vs. rainfall in 



the Barataria basin 112 



49 Locations of major petrochemical plants in the 



Barataria basin 119 



50 Phosphorus loading rates and salinity levels at various 

 locations in the Barataria basin with the limit of oyster 



production indicated by oyster drill activity 121 



51 Productivity of nearshore waters off Grand Isle, 

 Louisiana, and Mississippi River discharge 



measured over one year (August 1974 - September 1975) 124 



52 Patterns of estuarine use by nektonic animals 127 



53 Map of Terrebonne drainage basin showing the MDPR boundary 130 



54 Patterns of land area change in western Terrebonne Parish 132 



55 Map of Atchafalaya drainage basin showing the MDPR boundary 134 



56 Bathymetric maps of Atchafalaya Bay, 1967 and 1977 136 



57 Mean monthly discharge for the Atchafalaya River at 



Simmesport, Louisiana, 1956-1975 139 



58 Mean monthly discharge and suspended load near Morgan City, 



Louisiana, at the lower Atchafalaya River outlet, 1973-1975 140 



59 Annual tidal levels at Eugene Island, Louisiana, 1940-1970 141 



60 Effect of various weather patterns on water levels 



at Eugene Island, Louisiana 143 



61 Map of Vermilion drainage basin showing the MDPR boundary 145 



62 Oyster reef complexes in the Atchafalaya and Vermilion 



hydrologic units 147 



viii 



