Concrete block sinking well
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A less expensive alternative to concrete rings is the use of concrete blocks. The block are shaped by pouring concrete into a wooden form.
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From: Farm Structures in Tropical Climates http://www.fao.org/inpho/vlibrary/s1250e/s1250e00.htm.
Edited by Lennart P. Bengtsson and James H. Whitaker, FAO copyright 2000.
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