Treadle pumps are used for:

Treadle pumps are specifically designed for the efficient irrigation of crops by pumping groundwater from shallow depths, typically a few feet below the surface. This functionality makes them particularly suitable for smallholder farmers who may not have access to electric or large-scale pumping systems. The design of the treadle pump allows users to operate it using their feet in a manner similar to a step exercise machine; this pedal action creates a suction that draws water up from the ground and into a system for irrigation.

In addition, treadle pumps are commonly found in various regions, particularly in eastern Asia and parts of Africa, where they provide a sustainable solution to water access for agricultural purposes. Their widespread use in these areas highlights their adaptability and importance in supporting agricultural practices in regions that rely heavily on groundwater for irrigation.

Therefore, the choice that encompasses both the functionality of the treadle pump and its geographical prevalence is the most accurate.