Underwater currents can form in lakes, rivers and oceans, and there are many reasons why they happen.
People Also Ask
Dispelling the Myth of the RipRip currents do not pull people under the water; they pull people away from shore. The rip current is typically the strongest about a foot off of the bottom, which can cause your feet to be knocked out from under you making it feel like something under the water was pulling you.
You may have heard about the rip tide or undertow before. These are terms that people commonly use to describe dangerous currents. However, since there are no tides in the Great Lakes (needed to form a rip tide) and currents don't pull a person down under the water (undertow), they are a bit inaccurate.
However, the Great Lakes are so big that wind churns up waves and rip currents that can compete with those found in oceans. This year alone, 84 people have drowned in the five Great Lakes.
Lake Superior is notorious for dangerous waves of a different kind: clusters of rogue waves. These abnormally large waves are colloquially known as “the three sisters” because they appear to travel as a trio, the second and third wave swamping a ship before it recovers from the first battering.
If there is scum or algae visible in the water, it won't be clean enough to swim in. There are also natural hazards to outdoor waters compared with pools, especially in the summer. Blue-green algae is a type of bacteria naturally found in lake ecosystems.
Key Characteristics of Lakes and Ponds- In lakes, ponds, and inland wetlands, the water is standing, not flowing. Though currents can be swift as waters enter and leave ponds and lakes, in general, ponds and lakes move slowly because they have been blocked (by beaver dams, humans, natural rock cavities, etc.)