The water source of the well and the well is the same - groundwater, but the specifics of their construction are different.
The source of borehole water is artesian waters. Artesian waters, or pressurized waters, are located deeper below the earth's surface and are enclosed on both sides by water-impermeable layers, or trap layers. The regime of artesian water levels is determined by the geological section and the dynamic characteristics of underground waters.
Pond water is a surface water source, which contains a large part of pollutants - greens, fish excrement, dead aquatic plants, as well as intensive pollution of the pond with organic substances: garbage, fish feed, storm water.
Rain is part of the cyclic movement of water masses that have passed the stages of evaporation and condensation. As a result of these processes, drops of distilled water fall from the clouds.
Water is one of the most important things needed to sustain military operations. Water is needed for hydration (sufficient fluid levels in the body), food preparation, treatment, hygiene, construction, maintenance and many additional tasks.
The earth's surface consists mostly of salt water resources, and only a small fraction is fresh water that is safe and available deep in the earth. The salinity of the Baltic Sea is much lower than the ocean average because the Baltic Sea is almost completely enclosed and has a large influx of fresh water from rivers and precipitation.