Oxfam emergency water programmes should select the most appropriate approaches
to ensure access to and use of safe, sufficient water to affected communities for
drinking, cooking and other uses.
These approaches deal with distributing bulk quantities of water to users.
Oxfam Water Distribution Manual
A Handbook of Gravity-Flow Water Systems
Design of Water Collection Points
- Water collection points should be designed to avoid standing water around them; in particular, a proper soakaway should be incorporated to the design.
- The tap stand should be no more than 10cm (4”) higher than the tallest locally used water container.
- Ensure that provision is made for people with limited mobility to access water.
- Users should be consulted on tap stand locations but try to ensure the tap stands are located safely and strategically (near to schools, health and feeding centres etc.)
- Low maintenance requirements and the formation of User Management Committees are essential for building local capacity, improving resilience and sustainability.
- Technical calculations and detailed drawings are required before construction begins.
- Pipe design networks should range between the following values:
- Flow rates to faucets 0.1 to 0.3 l/s
- Tap stand residual heads 4 to 12m (depends on faucet type) Velocity in all pipes 0.3 to 1.5 m/s generally. Refer to the guidelines for the exact figures.
- All PVC/PE pipes should have classed pressure ratings with the minimum 6kg/cm2 (higher pipe pressure ratings may be required depending particular design)
- PVC/PE distribution pipes should be buried a minimum of 0.8m (1.5 in sub zero temperatures). When pipes cannot be buried GI pipes should be used.
- All designs that pass through landslide prone areas should have serpentile or progressive joints for quick isolation, diversion or replacement.
- Gravity designs should include appropriate wash out and air purging points where necessary to ensure the correct functioning of the system.