Genesis 29:2

29:2 He saw in the field a well with three flocks of sheep lying beside it, because the flocks were watered from that well. Now a large stone covered the mouth of the well.

Genesis 30:38

30:38 Then he set up the peeled branches in all the watering troughs where the flocks came to drink. He set up the branches in front of the flocks when they were in heat and came to drink.