Section 4: Soil and Water Conservation Engineering
Hydrology
Subtopic: Analysis of precipitation data
Question Statement:
The double mass curve technique is widely employed in hydrological data analysis to:
Options:
(A) Check the consistency and homogeneity of rainfall records at a station
(B) Determine the optimum spacing of rain gauge stations
(C) Separate baseflow from surface runoff
(D) Estimate the peak flood discharge from ungauged catchments
Answer Key:
A
Step-by-Step Solution & Explanation
The double mass curve plots cumulative rainfall of the test station against the cumulative rainfall of a group of surrounding base stations. A persistent change in slope indicates in-homogeneity or inconsistency due to changes in gauge location, exposure, or instrumentation.