Put geotextile fabric down before you put the sand/gravel down, it will minimize the amount that gets incorporated into the soil under it over time.

You can run that geotextile fabric into the pond, over a horizontal line of cinder blocks to help "trap" the sand that goes down slope.

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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).