Maybe over time, and after many rains, a stream was rerouted through the old temple ruins. It would probably be where the Impions would get their drinking water from to. It would be pretty convenient since they live in the ruins.
The Ruins of Old Nor. Nor was once a successful and large city in Scotland. No one knows what happened to cause its citizens to abandon it. Centuries later, a small village was built farther south and named after the mysterious city.