Great news for GWWI Kenya Grads! According to the Kenyan Ministry of Water Deputy Director of Water Resources Juma Omondi, the Kenya Rainwater Harvesting Act
will be enacted by the end of 2012. The law will advocate for the integration of household and industrial rainwater harvesting (RWH) technologies. And Nairobi will join the likes of Indian cities New Delhi, Mumbai and Bangalore requiring new homes to have rainwater harvesting infrastructure before the building can be approved.
This past year, some GWWI graduates learned to build roof catchments and a storage tank made out of interlocking stabilized blocks (ISSB). The ISSB tank is a relatively new technology that is now gaining traction in Kenya and the East Africa region because it costs less and is more durable than the other alternatives like a polytank (plastic) and ferrocement tank. The ISSB is made out of marram (orange clay/soil), sand, a little cement and water. This mixture is compressed in a block making machine that requires no electricity just human sweat. It’s also manufactured in Nairobi (Kenya’s capital city), further keeping the construction and material costs down. Most simple brick making techniques require drying in the sun, whereas the ISSB is ready for use in 24 hours regardless of the weather. What makes this technology cutting edge is the shape of the bricks. Unlike traditional bricks that are flat and rectangular in shape, the ISSB bricks are shaped to interlock like a puzzle, which reduces the amount of cement for bonding and creates a stronger foundation and structure for the tank.