The Jumbo Jar is made from a thin layer of ferrocement (see description above) that is constructed using an internal mould to provide the complex shape necessary to support the weight of water with minimal cement. This type of tank requires the most skill to build but is one of the cheapest ways to make a tank out of cement. Once constructed the tank holds around 3,000 litres. A tank of this size will provide a family of five with 25 litres of water a day for drinking and cooking for four months
While Jumbo Jars are popular because of their cost and traditional shape RainWater Cambodia prefers to build other styles of tank, such as concrete ring tanks, that are more easily constructed using local labour. This maximises the skills transfer and capacity building aspects of our work.