About the making physical contour barriers with trash/stone

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Fundamentals of Soil and Water Conservation
Engineering
(AGL308)
Mr. Rohitashv Nagar
Assistant Professor
Department of Agronomy
School of Agricultural Sciences
Career Point University, Kota (Raj.)

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Exercise - 4
Making physical contour barriers with trash/stone

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Objective: To construct physical contour barriers with trash/stone
Materials
• Fork
• Spade
• Shovel
Procedure
Marked out your contour line:
Trash barriers:
1. Collect all dry cut grass, twigs, crop residue etc. From around the farm
2. Lay this trash along the contour lines in 1m or 2m wide strips

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Note: Trash lines can be very effective in low-rainfall areas
where the slope gradient is low and the land is almost flat.
One big advantage is that trash lines can easily be moved if
you need to change the lay-out of fields or if pegging was
not done properly. Compared to the conservation works
(which require digging) this is a big advantage.

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Stone lines:
Where there are plenty of stones in the field, they can be moved and
arranged in lines along the contour. Like trash lines, stone lines are
permeable
Procedure:
1. Prepare a shallow drain or trench, 10-15 cm deep and about 30-40
cm wide, by digging along the contour line.
2. Place larger stones at the bottom of the trench as a foundation.
3. Place smaller stones on top to a height of 25-30 cm.

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Useful tips:
• Killed grass strips along the contour line can be kept and trash
added to it.
• Stone lines can be further improved by placing trash or planting
grasses just in front of the stone line.

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