Section 4: Soil and Water Conservation Engineering
Precipitation Analysis & Rain Gauges
Subtopic: Double mass curve analysis
Question Statement:
In hydrologic precipitation data analysis, the Double Mass Curve technique is primarily utilized to:
Options:
(A) Check and adjust the consistency of a rain gauge record
(B) Determine the optimum number of rain gauges in a catchment
(C) Estimate the areal mean precipitation over mountainous terrain
(D) Compute the probable maximum precipitation (PMP)
Answer Key:
A
Step-by-Step Solution & Explanation
The double mass curve plots cumulative annual precipitation of a test station against the cumulative annual average of a group of base stations. A change in slope indicates inconsistency due to station relocation, change in gauge height, or environmental changes.