Table 3.71. Summary of natural anil cultural features of Calcasieu Basin. 



A. Hydrology of the Calcasieu Basin 



B. Primary production, potential yield and harvest of 

 living resources of Calcasieu Basin. 



Riverine Processes 



Freshwater flow volume (flow upstream) 

 49.8 X lO^m^/yr 



Seasonal: (see fig. 3-43) 



Upstream drainage area 



13,723 km^ 



Annual rainfall— 138 cm (at Lake Charles) 



.Annual rain surplus 49.3 cm/yr 

 Seasonal: (see fig. 3-43) 



Minimum freshwater renewal time: 37 days 



Surface water slope: 



Cameron Pass to Hackberry 0.76 cm/km 



Hackberry to Lake Chailes 0.19 cm/km 

 (see fig. 3-44) 



Tides: 



Range: 500 cm (average of 1961-71 annual mean) 

 (see app. 6.4) 



Period: Semi-diurnal with large diurnal inequality 

 (see fig. 3-44) 



Water level variation 



Seasonal: Peaks in April and September 

 (see fig. 3-44) 



Long-term: 2.0 to 3.1 cm/yr raise 

 (sec fig. 3-44) 



Salinity: 



Seasonal: (see fig. 3-43) 

 Long-term: (see fig. 3-45) 



Control structures and modifications 



Salt water barrier above Lake Chailes 



Major ship channel from Gulf to Lake Charles 



GIWW 



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 

 Rice (t/yr) 



Commercial species harvest 



Per 

 basin 



1,452 2,550,299 



Method explained in part 3.5.2 



Present harvest attributed to basin (part 3.2.4) 



16.3 

 46.8 

 98.2 



147.8 



272.0 



581.1 



5,839 



continued 



122 



