Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
The simplest and cheapest method of lifting groundwater from an open dug well or surface water source is by means of a rope and a bucket. The job of drawing water from the well can be made easier by adding a “windlass” (a horizontal cylinder with a winch which can be turned to raise the bucket on a rope) or a “Shadouf” (an upright frame with a long pole suspended on top with the bucket hanging from one end and a weight which serves as the counterpoise of a lever at the other).
The basic Shadouf consists of a rope, pole, bucket and counterweight and is capable of lifting water up to 4 metres. The counterweight can be just a heavy rock, however, in the more advanced picottah design, one person guides the bucket while the other acts as a moving counterweight. The Shadouf is generally used for lifting water from unlined wells, streams or ponds for irrigating small fields. Approximately 60 litres/min can be lifted from a depth of 2 to 3 metres.
Advantages
• A relatively inexpensive traditional technology, which can be locally made and maintained.
• Easy to operate
• Relatively efficient (30-60%)
Disadvantages
• Limited to lifts of less than 4 metres
• Limited water yield, 60 l/min suitable for small fields
The simplest and cheapest method of lifting groundwater from an open dug well or surface water source is by means of a rope and a bucket. The job of drawing water from the well can be made easier by adding a “windlass” (a horizontal cylinder with a winch which can be turned to raise the bucket on a rope) or a “Shadouf” (an upright frame with a long pole suspended on top with the bucket hanging from one end and a weight which serves as the counterpoise of a lever at the other).