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Nature is an amazing force that has maintained order and harmony on our planet for millions of years. Each, even the most insignificant element in it has its own meaning and purpose. Take rivers, for example: they cross all existing continents and have helped humans survive since prehistoric times. Rivers are a source of drinking water and fresh food for us. And they are also essential for the irrigation of agricultural lands and the transportation of people and goods from one settlement to another. However, in order to peacefully coexist with particularly full-flowing rivers, humans still have to interfere with their structure. For example, since ancient times, people have learned to build dams on waterways, which help regulate the flow of water. Today we will tell you about the basic principles of their structure and the horrific consequences of improper design.