Question

If 'p' is the precipitation, 'a' is the area represented by a rain gauge, and 'n' is the number of rain gauges in a catchment area, then the weighted mean rainfall is

• A. $\frac{\sum {\text{ap}}^3}{\sum {\text{a}}^2}$
• B. $\frac{\sum \text{ap}}{\text{n}}$
• C. $\frac{\sum \text{ap}}{\sum \text{a}}$
• D. $\frac{\sum {\text{ap}}^5}{\sum {\text{a}}^3}$

Answer 1

The correct option is C $\frac{\sum \text{ap}}{\sum \text{a}}$

Weighted mean rainfall can be calculated according to Theissen Polygon method also called as Weighted Area method.