The rainfall distribution pattern over the Ganga basin decreases from the West to the East and North to the South.

Explanation:

Every year, the Ganges basin receives almost 1,000 mm of rain. The monsoon season receives the most rain, accounting for 84 percent of the yearly total. The remaining 7% occurs during the premonsoon season, 5% during the postmonsoon season, and 4% during the winter. The upper and lower Ganges basins have slightly different precipitation patterns. Although the annual amount of precipitation in the lower and upper regions of the basin is similar, the number of wet days differs significantly. There are 179 wet days in the upper basin, whereas there are 152 rainy days in the lower basin.