Point Rainfall Analysis (\( R_{ave} = \frac{A1R1 + A2R2 + \ldots + AnRn}{At} \)):

Where:

• \( R_{ave} \) is the average rainfall, in mm.
• \( R \) is the rainfall depth, in mm.
• \( A1, A2, \ldots, An \) are the areas within the polygons, in m².
• \( At \) is the total area of the basin, in m².