It all depends on the goals and type of cover you are creating. In my instance, I did use the weed block fabric, because with the water level fluctuations, the rip-rap would be soon become a weed choked mess.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).