In Indiana Jones and the Temple of Doom, Indiana ends up in Mayapore, a village in India, where a drought struck after their sacred stone was stolen and their children were stolen. The villagers believe that the drought is caused by the theft of the stone; however, the Thuggee cult seemed to have stored up a large reservoir of water, possibly implying that the water had simply been blocked off for their purposes, possibly as secondary blackmail to force the villagers to join them or convince them of their power.
The main problems with this are that if they needed to use the water and that is why they blocked it, there's not much reason to wait until they have the stone, besides convincing the villagers that there was a connection, and that the reservoir does not seem to be that large, nor is it made apparent from whence it flows. Furthermore, mystical powers are shown to be at work throughout the film, including curses, and the stone itself is shown to have powers of its own at the end when it burns High Priest Mola Ram, causing him to fall to his death, and not Indiana.
What is the official cause of the wells and rivers of the village running dry?