The water pump operate on power generated using solar pv system. the photovoltaic array converts the solar energy into electricity which is used for running the motor pump. It is just like the tradditional electric pump with the only exception that is uses solar energy instead of fossil or electricity there are several types of solar powerd pumps submersible pump, surface pump,dc pump, ac pump etc. 

ADVANTAGES 

Does not get affected by power cuts, low voltage, single phase problems, or the motor burning 

Low maintenance cost 

Easy to operate/no hassles from load shedding 

It can be operated on solar energy or on electricity 

Environment friendly and contribute to national growth due to energy generation