Goal
Reduce the effort and time required for rural households to collect and transport water.
Problem
Long distances and heavy loads associated with traditional bucket water collection, leading to health issues and loss of productivity.
Concept Summary
A large, UV-stabilized polyethylene drum that rolls on the ground, allowing up to 90 L of water to be carried with an effective load of only ~10 kg on level terrain. The drum is sealed, has a large opening for easy filling, and a steel handle for steering over rough ground.
Detailed Description
The Hippo Water Roller is a 90-kg (200 lb) water-filled drum made from UV-stabilized polyethylene. It features a 135 mm opening for loading, a sealed lid for hygienic storage, and a steel handle for control. By placing water inside the rolling drum rather than on the head, the weight is borne by the ground, reducing the effective load to about 10 kg on flat surfaces. Field tests over many years have shown that users can collect roughly five times more water in less time with far less effort. The drum can also be integrated into a drip-irrigation system (Hippo Food Security System) that supplies water to small gardens.
Principles
- Rolling wheel reduces friction and distributes load
- Gravity-assisted transport (weight borne by ground)
- Mechanical advantage via large drum radius
- Sealed container for hygiene
Scientific Domains
Materials
- UV-stabilized polyethylene
- Steel (handle)
- Plastic (drip-line tubing)
Mechanisms of Action
- Rolling drum moves water while keeping the load on the ground
- Steel handle provides steering over uneven terrain
- Sealed lid prevents contamination
- Integration with drip irrigation delivers water slowly to plant roots
Energy Sources
Applications
- Household water collection
- Small-scale drip irrigation
- Community health improvement
- Food security in low-income regions
Claimed Performance
Approximately five times the normal amount of water can be collected in less time with far less effort; effective load reduced from 90 kg to ~10 kg on level ground.
Experimental Evidence
Extensive field tests over many years and various awards have proven the effectiveness of the Hippo Water Roller.
Limitations
- Requires human effort to move the drum
- Bulk and heavy when empty, making long-distance shipping costly
- Limited to ~90 L per load
- Effectiveness depends on terrain (effective load increases on steep slopes)
