Nasal congestion Nasal congestion is a stuffy nose, and can be accompanied by blocked ears, sore throat, and more. Pleural effusion Pleural effusion is buildup of fluid in the pleura and can cause difficulty breathing or chest pain.
A hydroelectric dam is essentially a mechanical gateway that can control how often, how much, and how fast the water is allowed to passed through. Water above the dam is collected and stored into a reservoir.
The Department of Energy's Hydropower 101 video explains how hydropower works and highlights some of the Water Power Program's efforts in R&D in this area (to see how a hydroelectric system works, see our How Hydropower Works page):