ml - 'ml . i. i. .-.*!•! 



Figure 1. Status of the TLT mitigation bank area in 1982. 



3. Increase herbaceous vegetation in and around open water. 



4. Aid in ingress and egress of marine organisms. 



5. Stop the conversion of vegetated marsh to open water. 



6. Manage the vegetation for furbearing mammals, alligators, and waterfowl. 



Structural measures have been installed to reduce the salinity and stabilize the water levels within 

 the bank area. Both the quantity and quality of the vegetation should improve as a result of better 

 water management (Figure 2). 



Two Fixed-crest weirs have been installed along the Marmande Canal, and one weir was placed 

 along the Minors Canal to allow additional freshwater to enter on the north end of the mitigation 

 area. Breaks have been made in the spoil bank of the pipeline canal, which extends east-west 

 across the mitigation area, to allow freshwater to flow into the intermediate and brackish marshes 

 to the south. The Frxed-crest weir in Minors Canal along the western boundary of the area will 

 permit additional freshwater to enter the segment of the mitigation area which is experiencing rapid 

 marsh loss from saltwater intrusion. 



To further minimize saltwater intrusion, an existing weir was replaced in the southeastern corner 

 of the mitigation area. This variable -crest weir allows drawdowns or ponding of freshwater, 



321 



