excerpt from The Lost Science of Organic Cultivation page 103. Brahma Publications, 1997.
…This system is adaptable to dry and monsoon conditions when the composting base is set upon a raft inside a bamboo tower. Each own of these towers reaching to say each of the three floors of a building. If floods occur then the raft floats up inside the tower preventing pollution and loss of a valuable product. The composting process continues even in the worst weather conditions, as a roof is naturally fitted over the latrine.