A weir is constructed to
- AControl flood levels
- BMeasure discharge
- CRegulate river flow
- DAll of the aboveCorrect
Solution
Concept
Purposes of a weir
Step-by-step solution
1. A weir raises the water level (for diversion), regulates river flow and controls flood levels. 2. It can also be used to measure discharge. 3. So all of the listed uses are valid.
Explanation
Weirs are obstructions across rivers that control the water level upstream, regulate the discharge and are also used for measuring flow. So "all of the above" is correct.
Shortcut
Weir uses: diversion, flood control, regulation, measurement.
Common mistake
Choosing a single use.
Correct answer: D) All of the above