What is the main disadvantage of using a flume compared to a weir?

• A. High Maintenance
• B. Inaccuracy
• C. Initial Costs
• D. Space Requirements

Answer: (C)

The key idea is that while flumes can offer precise flow measurements, they come with a higher upfront investment. Installing a flume requires careful, exact fabrication of the throat, proper foundation and alignment, and often additional instrumentation and calibration to establish site-specific discharge relationships. That combination of specialized design, construction, and setup drives up capital costs compared with a weir, which is a simpler, cheaper structure to build and requires less precise installation. Once installed, a flume can be very accurate, but the initial cost is the most significant drawback.