|Our area has been flooded recently (Kentucky, Indiana) by about 15 inches of rain. How is it that the Ohio River has risen so many feet and not just 15 inches? — RK
The Ohio River is carrying water collected by vast areas surrounding the river and this accumulated volume of water is enough to raise the river's level by many feet. Similarly, if you collected all the rain water that accumulated on your yard and poured that water into a bathtub, the level of water in the bathtub would rise far more than 15 inches.