Question

which solution would help local farms if the water level in a reservoir used for irrigation became low? build chinampas to raise the farmland. build wind - powered pumps to use groundwater. use shadufs to dig out the reservoir. turn farmland into paddies.

Explanation:

Building wind - powered pumps to access groundwater can provide an alternative water source when reservoir levels are low. Chinampas are related to ancient floating gardens and not a solution for low reservoir levels. Shadufs are used for lifting water, not for digging out reservoirs. Turning farmland into paddies would require more water, not solve the low - water problem.

Answer:

Build wind - powered pumps to use groundwater.