In the CBSE Class 10 Geography chapter 'Resources and Development', you study the massive danger of Soil Erosion—where heavy rain completely washes away the top, fertile layer of a farmer's soil.
To prevent this massive destruction, especially on steep mountains and hillsides, farmers use a brilliant, ancient agricultural technique called Contour Barriers.
Definition: Building physical barriers of stones, grass, and soil along the contours of a slope to intercept water flow.
Primary Purpose: To drastically reduce Soil Erosion caused by fast-flowing mountain rainwater.
Associated Technique: Trenches (गड्ढे) are always dug immediately in front of the barriers to collect the trapped water.
Location: Heavily used in hilly and mountainous farming regions (like Himachal Pradesh or tea gardens in Assam).
Imagine a farmer growing crops on a steep, slanted mountain. If there is a massive rainstorm, the water will violently rush straight down the slope, taking all the precious mud and seeds with it. To stop this, the farmer builds small, horizontal 'speed breakers' across the mountain using heavy stones, thick grass, and soil. These physical speed breakers are called Contour Barriers. Instead of rushing down the mountain, the rainwater violently hits these stone and grass walls, slows down, and collects in tiny trenches dug right in front of the barriers.
Do not confuse these two terms in the exam:
Contour barriers are physical walls made of stones, grass, and soil built across a mountain slope to act like speed breakers, stopping heavy rainwater from washing away the fertile topsoil.
By physically blocking the violent downward flow of rainwater, the barriers trap the soil from washing away and force the water to sink deeply into the ground, saving the farm.
Small, shallow trenches are dug directly in front of the stone and grass barriers to collect and hold the trapped rainwater.
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