Harvesting rainfall from rooftops is a relatively simple process that has proven effective in many parts of the world. Since the system described is comparatively inexpensive, and has a long life, the impact can be wide and enjoyed for decades. Clean water is absolutely vital to the health and well being of any community. This system will reduce the huge numbers afflicted by water borne diseases, and will free those tasked with searching for and collecting water, frequently polluted, to pursue other more productive activities. The potential health and economic benefits are enormous. This is a very worthwhile project.