A double mass curve is used in hydrology to:
Choose the correct answer
Compute double the expected rainfall
Check consistency of a precipitation (or streamflow) record by plotting cumulative data of a suspect station against cumulative mean of surrounding stations; a change in slope indicates an inconsistency
Plot two S-curves together
Analyze two catchments simultaneously
Correct Answer
B. Check consistency of a precipitation (or streamflow) record by plotting cumulative data of a suspect station against cumulative mean of surrounding stations; a change in slope indicates an inconsistency
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
Double mass curve: X-axis = cumulative precipitation (or Q) of reference group (average of surrounding gauges); Y-axis = cumulative precipitation of suspect station. Consistent record = straight line. Break in slope = inconsistency (station relocation, equipment change, land use change). Correct old data by adjusting to the recent slope.
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Practice more Civil Engineering questions
This MCQ belongs to AE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.