Habitations should be built on high, well-drained ground to avoid dampness, miasma, and subsequent disease.

Original passage

So far as possible, all buildings intended for human habitation should be placed on high, well-drained ground. This will ensure a dry site and prevent the danger of disease from dampness and miasma. This matter is often too lightly regarded. Continuous ill-health, serious diseases, and many deaths result from the dampness and malaria of low-lying, ill-drained situations.