Underwater currents can form in lakes, rivers and oceans, and there are many reasons why they happen.
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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.
Rip Currents are powerful currents of water moving away from shore, capable of sweeping even the strongest swimmers out to sea and are often called “killer currents” for a good reason. Although estimates vary, rip currents are responsible for approximately 100 deaths every year and probably thousands worldwide.
The main difference between rip currents and undertow. is that undertow pulls you under the water, while rip currents pull you away from the shore. And the main difference between a rip tide. and a rip current. is that a rip tide is powered by the tide, the ocean, while a rip current is powered by a channel.
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.)