How do I build a short retaining wall?


I need a retaining wall against my carport concrete slab to divert the water that washes over from the neighbor's slightly-higher lot. Some day my luck will run out and if we have heavy, fast rain parts of my house will be flooded. Someone suggested building it two cinder blocks high and putting a piece of clear plastic on the front side (side facing the neighbor's house). That sounds a little unsightly. Is there a better way? Should I mortar between the blocks? Are cinder blocks the best material to use? Thanks for your help.

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