The flow modification system 21, wherein the original prefabricated brace and the additional prefabricated brace are secured together with at least one other prefabricated brace similar to the original prefabricated brace in {HEAD ~ a configuration} enclosing {TAIL ~ at least three sides} of a region of the channel 
enclosing
The flow modification system 21 , wherein the original prefabricated brace and the additional prefabricated brace are secured together with at least one other prefabricated brace similar to the original prefabricated brace in { HEAD ~ a configuration } enclosing { TAIL ~ at least three sides } of a region of the channel
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