What causes soil erosion in the Siwalik hills of Himachal Pradesh?

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Steep, green slopes with dense trees rise on both sides of a narrow valley in Kullu Valley, Himachal Pradesh, India, with mist and clouds partially obscuring the peaks. — Himachal Pradesh The valley of the gods, Kullu Valley, central Himachal Pradesh, India.

Soil erosion in the Siwalik hills of Himachal Pradesh is primarily driven by the region's distinct climatic patterns. The area experiences a concentrated wet season from July to September, during which heavy rains are brought by the southwestern monsoon. These intense seasonal downpours, combined with the region's fragile geological composition, significantly accelerate the process of soil degradation and erosion.1