About Lesson
Land Grading:
- It is the reshaping of the field surface to a planned globe.
- It is necessary to control the flow of water to check soil erosion and provide surface drainage.
- Essential to ensure uniform distribution of water under the surface method of irrigation.
- Land grading operation may be divided into 3 phase:
a) Rough grading:
- It is the removal of abrupt irregularities such as mounds, ridges and dunes and filling of pits, depressions and gulley.
b) Land Levelling/Land grading/Land Shaping/Land forming:
- It is the reshaping of the land surface to a planned grade.
- Requires moving of large quantities of earth over considerable distance.
- Levelling operations leaves an irregular surface due to damping the loads.
c) Land smoothening/Land floating/land planking:
- Here, irregularities left from levelling operation are removed and a plain surface obtained by a land smoothing is done.