Table 3.68. Summary of natural and cultural features of Vermilion Basin. 



A. Hydrology of the Vermilion Basin 



B. Primary production, potential yield and harvest of 

 living resources of Vermilion Basin. 



Riverine Processes 



Freshwater flow volume (into basin) (fig. 3-33) 



Vermilion River 15.9 x 10*m^/yr 



Atchafalaya River 

 dilution of Vermilion Bay from the east 



Annual rainfall 144 cm (Lafayette) 



Annual rain surplus (fig. 3-33) 

 60.6 cm/yr 



Minimum freshwater renewal time: 

 61 days 



Surface water slope: 



Vermilion River 1.25 cm/km 

 Freshwater B/Schooner B-0.28 cm/km 



Tides: 



Range: Vermilion River at Vermilion Lock 



37.5 cm ± 15 cm (standard deviation) 



Period: Diurnal (predominantly) 



Water level variation 



Seasonal: Spring-Summer peaks, 



winter minimum (fig. 3-34) 



Long term: 0.94 cm/yr rise (1945-1974) 

 (fig. 3-34) 



Salinity: 



Seasonal: (fig. 3-35) 

 Long-term: (fig. 3-36) 



Control structures and modifications 

 At Schooner Bayou, Vermilion Lock 



Per 



km^ 



Net primary production (t/yr) 

 Appendix 6.3 



Sport hunting and fishing use 

 estimated potential yield 



Big game (man-days x 1000/yr) 

 Small game (man-days x 1000/yr) 

 Waterfowl (man-days x 1000/yr) 

 Saltwater finfishing 



(man-days x 1000/yr) 

 Freshwater finfishing 



(man-days x 1000/yr) 



Total 



Agriculture 



Commercial species harvest 



Shrimp (kg x 1000/yr) 

 Menhaden (kg x 1000/yr) 

 Blue crab (kg x 1000/yr) 

 Oyster (kg meat x 1000/yr) 

 Other saltwater finfishes 



(kgx 1000/yr) 

 Freshwater finfishes 



(kgx 1000/yr) 

 Nutria (pelts /yr) 

 Muskrat (pelts /yr) 



Per 

 basin 



1,047 1,999,100 



14.2 

 23.7 

 63.0 



76.7 



127.0 



70.7 



32.9 

 31,324 

 19,500 



Method explained in part 3.5.2 



Present harvest attributed to basin (part 3.2.4) 



continued 



97 



