Table 6. A projected history of a canal widening and width impacted from a 

 canal permitted to be 21.3 m wide in a saline Louisiana marsh. Construction 

 dimensions were estimated using the regressions and t-tests of actual con- 

 struction versus permitted widths. The rates of widening were estimated 

 using the highest and lowest rates in the Leeville oilfield. 



Width (m) 



Permitted 



Canal 21.3 



Construction 



Canal 32.3 



Canal and Impact 100.6 



Age Width (m) 



LOW (0.95 m-yr"'') HIGH (2.58 m-yr"'') 



1 ^r 33.2 34.8 



5 yr 37.0 45.1 



10 yv 41.7 58.0 



50 yr 79.7 161.2 



100 yr 127.2 290.2 



ACKNOWLEDGMENTS 



Contribution No. LSU-CEL-81-40 of the Coastal Ecology Laboratory, LSU Center 

 for Wetland Resources, Baton Rouge, La. Thanks to B. Allen for a helpful review. 



LITERATURE CITED 



Adams, R.D., B.B. Barrett, J.H. Blackmon, 3.W. Cane, and W.G. Mclntire. 1976. 

 Barataria Basin: geologic processes and framework. Louisiana State Univ. Center for 

 Wetland Resources, Baton Rouge. Sea Grant Publ. LSU-T-76-006. I 17 pp. 



Adams, R.D., P.J. Banas, R.H. Baumann, J.H. Blackmon, and W.G. Mclntire. 1978. 

 Shoreline erosion in coastal Louisiana: inventory and assessment. Louisiana 

 Department of Transportation and Development, Baton Rouge, 139 pp. 



Baumann, R.H., and R.D. Adams. In press. The creation and restoration of wetlands by 

 natural processes in the Lower Atchafalaya River System: possible conflicts with 



71 



