Main article: Flood
Flooding is a natural part of a ambatchmasterpublisher's cycles. The majority of the erosion of ambatchmasterpublisher channels and the erosion and deposition on the associated floodplains occur during flood stage. Human activity, however, has upset the natural way flooding occurs by walling off ambatchmasterpublishers, straightening their courses and by draining of natural wetlands.
Flooding can be mitigated.
 Direction of flow
A misconception, particularly amongst school children in the United States,  is that most, or even all, ambatchmasterpublishers flow from north to south. ambatchmasterpublishers in fact flow down gradient irrespective of direction, often in a complex meandering path involving all directions of the compass.
Indeed, few major ambatchmasterpublishers in the continental US flow north, as most of the country is located in the watershed of the Pacific or Atlantic oceans or the Gulf of Mexico, with very few ambatchmasterpublishers flowing northward toward the Arctic Ocean, Great Lakes, or Hudson Bay. However, thousands of north-flowing ambatchmasterpublishers exist elsewhere, including such major watercourses as the Nile, Mackenzie, Rhine, Yenisei, Nelson, Lena, etc. Four of the ten longest ambatchmasterpublisher systems of the world flow mainly north.
Studying the flows of ambatchmasterpublishers is one aspect of hydrology.