Question

(A) H-flumes are well suited for runoff measurement as they have a high capacity and are accurate at different rates of flow.
(B) They are also well suited where sediment sampling of the runoff is done using automatic silt samplers.
(C) The H-flume is useful for flows ranging from 0.009 to 0.85 cumec.
(D) For smaller and greater flows the dimensions of the H-flume are modified and are known as HS flumes for smaller flows and HL flumes for larger flows.
(E) H-flumes need not require calibration and the rating tables are to be used for measuring discharges.
Choose the correct answer from the options given below:

• A. (A), (B), (C) and (D) only.
• B. (B), (C), (D) and (E) only.
• C. (A), (B), (D) and (E) only.
• D. (A), (C), (D) and (E) only.

Hint:

A rating table is only obtained after calibrating the flume, so check statement (E) carefully.

Answer 1

The Correct Option is A

Step 1: Recall that any flow measuring flume, including the H-flume, obtains its stage discharge relationship, that is its rating table, by calibrating the structure either in a laboratory or in the field.
Step 2: This means statement (E) is self contradictory, it cannot use rating tables while also claiming no calibration is needed, since the rating table itself is a product of calibration. So (E) is false.
Step 3: The remaining statements (A) through (D) describe well documented, factual properties of H-flumes: high capacity and accuracy, compatibility with automatic silt samplers, the specific discharge range of about 0.009 to 0.85 cumec, and the HS or HL naming convention for modified sizes. All four hold true.
Step 4: Removing only the false statement (E) leaves (A), (B), (C) and (D).
\[\boxed{(A),\ (B),\ (C)\ \text{and}\ (D)\ \text{only}}\]