Explain the rain shadow effect and its implications for development projects in India.

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Rain shadow effect refers to topographic phenomena wherein mountain ranges block moist air causing heavy precipitation on the windward side. This causes dry arid conditions on the leeward side.

Mechanism of rain shadow effect:

1. Moist air from dry and sea/ocean approaches mountain range

2. As it rises on the windward side, it cools, condenses & causes orographic rainfall

3. After crossing the plate, dry air now descends on the leeward side & warms up, reducing chances of precipitation

4. This is referred to as scasc shadow effect - region masked by and conditioned

Due to uplift of moist air i.e., orographic rainfall eg. western ghats windward side receives >800 cm of rain.

2. Leeward side - low rainfall because of descending dry air eg. Eastern side of western ghats, northern slope of Himalayas

Impact on vegetation:

1. Wind-ward side - dense forests, tropical vegetation eg. evergreen forests in Kerala & Konkan ranges

2. Leeward side - characterised by shrublands from forests, grasslands. eg. Vidarbha, Rayalseema regions

Global examples:

The main shadow effect is crucial in understanding local climates & biomes. It assists in agricultural planning, settlements pattern, preparing disaster management plans (eg. cloudburst likely on windward side)