Water tanks with HFB technique

In extended areas of the world water is so scarce that for many people the possibility of storing drinking water is of vital importance. This paper describes a very simple technique for water tank construction called H-F-B (heart filled blocks). The technique makes use of a simple mould (which can be made even in rural areas) for the manufacture of concrete building blocks. The block pro­duction is easy and requires the use of neither energy nor skilled workmen.