Shapes & Form: Foundation of a House

The foundation of a house is particularly important especially if the house sits on a hill.
Usually, for houses on a hill, there will be major concerns if:
1. Proper landslide -- protection not adequate. Even if landslide protection are adequate:
Too many houses were built on the hill. Resulting in a higher or heavier weight. The problem is often compounded with heavy rainfalls.
2. Heavy rainfalls have an impact because, it dramatically increases the weight of the land.
Warmest Regards,
Cecil