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 Tidal Barrages-A tidal barrage works like a dam. 2  When the tide goes high, the reservoir fills up. 3  When the tide drops the dam lets the water out. 4  In both directions the moving water can spin the blades of turbines to create electricity.