1.
Before sunrise,
lie down flat
placing the chin
on the earth.
Take a look
out over the country.
Then, dig
in places where vapors are seen
curling and rising
into the air.
2.
The following test should be applied:
Dig out a place
not less than three feet square
and five feet deep.
Put into it about sunset
a bronze or leaden bowl.
Smear the inside with oil,
lay it upside down
and cover the top
with reeds or green boughs.
3.
After applying these tests
and finding the signs described above
and if a spring of water is found
more wells must be dug.
4.
Such places
face away from the sun's course
and the trees are thick in them
and the mountains,
being themselves
full of woods,
cast shadows of their own
preventing the sun
from striking the ground.
Taken from Vitruvius' eighth book on architecture.
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