An approximate 0.15-meter buildup of silt was recorded 1 meter inside 

 the tire wave-stilling device. Buildup was only about 0.03 meter in the 

 middle area. At the upper elevations slight erosion occurred. 



Generally, plants did not establish without protection from waves. 

 Two previous plantings at block XVII without adequate protection failed. 

 Survival followed by the development of a solid stand of smooth cordgrass 

 occurred in block IV with protection, but smooth cordgrass failed to 

 survive in three wave-exposed blocks. Thus, at least initial protection 

 from wave action is needed. 



Wave-stilling devices must be high enough to break most of the wave 

 force. Two tiers of tires were required for wave-stilling devices 

 constructed of tires strung on a cable because the bottom tier sank into 

 the mud bottom. This also was evidenced by previous failures of plantings 

 in blocks XVI and XVIII. 



Despite the initial poor survival (8.9 percent) behind the baled 

 hay wave-stilling device constructed in March 1975 (block XI) , repro- 

 duction occurred. This device was destroyed by wave action 5 weeks 

 after construction. 



Continued growth of saltcedar plants was recorded. Tiller produc- 

 tion of giant reed and needlegrass rush continued from plantings in 1974. 



26 



