Rick, The clay I bought from the web site are 17.64 ounces (500 grams) for $3.49 each. For the area I showed in the photographs, I used 3-1/2 of the 6 I bought. A quick estimate is 4 pounds to do what I did. I really had no idea how much to buy. Your plan sounds great!! I'm going to use some of the open brick to mold the transition from the street end to the bridge on the right.
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