Without a stable soil, many buildings are unsound. Drainage is another important quality of soil. If a soil has no structure, water will not seep into the soil for plant use. It is also more likely to cause erosion of the soil into local rivers and streams. Soils with a balance are usually desired for building.
Agricultural land is a prime example of incorporating soil into the planning process.
The soil used in farming is a rapidly disappearing commodity. These soils are highly fertile and produce extensive amounts of food for nearby cities. However, they are also easily built upon and inexpensively acquired. The Growth Management Act helps preserve agricultural land by setting it aside as a Natural Resource Land and protecting the soil from urban sprawl. Sources Growth Management Act, Washington State House of Representatives.