Genesis 8:5

And still the waters went on falling, till on the first day of the tenth month the tops of the mountains were seen.

Genesis 7:11

In the six hundredth year of Noah's life, in the second month, on the seventeenth day of the month, all the fountains of the great deep came bursting through, and the windows of heaven were open;

Treasury of Scripture Knowledge

Summary

And the waters decreased continually until the tenth month: in the tenth month, on the first day of the month, were the tops of the mountains seen.

Decreased continually

Bible References

Decreased continually

Genesis 7:11
In the six hundredth year of Noah's life, in the second month, on the seventeenth day of the month, all the fountains of the great deep came bursting through, and the windows of heaven were open;

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain