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Concrete ring tank water storage for roof catchments
Diagram by Erik Nissen Peterson. Concrete ring tank sections can be used to form water tanks of about 2,000 liters capacity. The small tanks can be used to catch rain from compound roofs. A reinforced concrete cover should also be installed.
 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.