Wastewater New York State Practice Exam

What is a flat board placed in flowing water to create uniform flow velocities called?

1. Weir

2. Baffle

3. Filter

4. Divider

The correct answer is: Baffle

The term that identifies a flat board placed in flowing water to create uniform flow velocities is a weir. Weirs are structures that reduce the velocity of water to regulate flow and create a more stable environment. This control allows for a more consistent measurement of flow rates which is crucial in wastewater management. Baffles, while important in certain applications, are typically used within tanks to redirect flow, enhance mixing or separation, and create multiple flow paths. Their purpose is not specifically to create uniform flow velocities in open channels. Filters are mechanisms used to remove particulates or contaminants from water but do not relate to the creation of flow characteristics. Dividers, on the other hand, are partitions that separate flow paths but do not influence flow velocity to the same extent that a weir does. Therefore, a weir is the structure designed to establish a specific flow pattern and achieve uniform flow velocities as intended in the question.