Table 3.40. Volume of industrial and municipal water intake (millions of cubic meters) by source in southwestern 

 Louisiana (Louisiana Department of Public Works 1970). 



Source 



Industrial 



Municipal 



Volume 



Percent 



Volume 



Percent 



Surface 

 Ground 

 Purchased^ 

 Total 



226 



484 



10 



720 



31 



67 



1 



99 



6 

 63 



69 



8 

 92 



100 



Usually from surface water. 

 Table 3.41. Daily (cubic meters) and annual (millions of cubic meters) industrial and municipal water use by basin. 



At 0.382 m /man/day (Louisiana Department of Public Works 1969). 

 At 300 m /employee/day (Louisiana Department of Public Works 1970). 

 (Texas Water Development Board 1977). 



Table 3.42. Annual volume of water use (millions 

 of cubic meters) in the Sabine (Texas) 

 Basin^ (Texas Water Development 

 Board 1977). 



Sum of use for Orange County in Sabine River drainage, 

 Jefferson County or Zone 2 in Nechcs drainage, and 

 Zone 1 of the Neches-Trinity drainage. Some exaggera- 

 tion results from inability to delineate data along bound- 

 ary lines. 



the export-import traffic is through the ship channels 

 of Calcasieu and Sabine basins. Through traffic along 

 the intracoastal waterway accounts for a large propor- 

 tion of the total traffic. Local production is supple- 

 mented by crude petroleum imports for refining at 

 Lake Charles and Port Arthur and exported as refined 

 petrochemicals. Other imports and exports are small 

 by comparison. 



From 1967 to 1975 total traffic has been stable 

 (fig. 3-14), but a significant increase occurred in 

 the Sabine Basin in 1976. 



Waterbome traffic requires construction of docks 

 and other facilities for ships. This is often accompanied 

 by land tilling and draining. In the Chenier Plain the 

 area involved is usually rather small, but localized dis- 

 ruptions of tlie environment have occurred. The major 

 requirement for waterbome traffic is deep navigation 

 access routes. Since natural channels in the Chenier 

 Plain arc rather shallow, all navigation canals are 

 dredged. There are 3,442 km (2,139 mi) of navigation 

 canals in the Chenier Plain (table 3.27). The major 

 transport channels are: the Gulf Intracoastal Water- 

 way (GIWW), which has a depth of 4 m (13 ft) and a 



58 



