About a device called hippo water roller that carries water without lifting. Used in African villages.
Good example of the kind of stuff i think would be great to see on Green Gadgets group. It certainly seems like a bona fide attempt to solve a problem and seems to have achieved a measure of success. The real measure, of course, is whether the device will be replaced by users (at their own cost) when it wears out. Will they end up in landfill or burned as fuel? Is it a one shot effort based on some (truly) ingenious thinking combined with a few big pocketed donors?
I would guess this item would retail about $100 in NA and am curious what the actual costs of made-in-Africa devices are. I guess you have to be a donor to find out but it seems a bit rich for the circumstances.
An inquiring mind asks if the heavy weight is hard to pull uphill and wonders about possible damage to the outer skin from sharp stones as it rolls along. What happens in the wet (muddy) season? No doubt though, for the right person in the right circumstances, it's a godsend. 30,000 distributed already so that tells us not to be toooo cynical.
Overall seems like an interesting project (wish it were mine!!) but somehow i doubt it will find widespread acceptance compared to pipes or wells or traditional head-carry methods. I guess the tradeoff is concentration of people to be nearer the water hole vs the benefits of keeping them dispersed. Other questions - why didn't the locals invent this? What would it look like if conceived/ designed locally? Why not use widely available, used/ scrap drums? Do/can folks sell these into a secondary market? What price?