Water Measurement Flumes

In a Parshall flume, flow discharge can be measured using only a single upstream head measurement ($H_a$) provided the submergence ratio ($H_b / H_a$) does not exceed:

Options:

• (A) $0.60$ for small flumes ($1-3\text{ in}$) and $0.70$ for flumes of throat width $1-8\text{ ft}$
• (B) $0.95$
• (C) $0.10$
• (D) $0.30$