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.
1 Dam - Most hydropower plants rely on a dam that holds back water, creating a large reservoir  . Intake - Gates on the dam open and gravity pulls the water through the penstock , a pipeline that leads to the turbine. Water builds up pressure as it flows through this pipe.