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Land Grading in Irrigation and Drainage Engineering

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Land Grading in Irrigation and Drainage Engineering

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Questions and Answers

What is the purpose of land grading?

To control flow for irrigation and drainage purposes (correct)

To increase soil erosion

To create irregularities in the land surface

To reshape the land for aesthetic purposes

In land levelling operations, what is the purpose of rough grading?

To create mounds, dunes, and ridges

To remove abrupt irregularities and fill pits and depressions (correct)

To reshape the land to a planned grade

To leave an irregular surface due to dumping of loads

What is the final operation in land levelling?

Removal of irregularities

Land smoothing (correct)

Land levelling

Rough grading

Which terms are synonymous with land levelling?

Land levelling, land grading, land forming Signup and view all the answers

What are the benefits of land grading in unirrigated areas?

Reduction in soil erosion and provision for surface drainage Signup and view all the answers

What is the primary requirement for controlling flow in irrigation and drainage purposes?

Uniform grade without any irregularities Signup and view all the answers

What is the main purpose of a topographic map?

To provide information about the topography of an area Signup and view all the answers

What do U-shaped curves in contour lines indicate?

A summit or hill Signup and view all the answers

What do closed contours with higher values inside indicate on a topographic map?

A summit or hill Signup and view all the answers

What is the purpose of land leveling?

To modify the land surface for efficient surface irrigation Signup and view all the answers

What criteria does land leveling depend on?

Soil profile conditions, land slope, and climate Signup and view all the answers

What happens when contour lines coincide horizontally with a zero value?

It indicates a vertical cliff Signup and view all the answers

What do V-shaped curves in contour lines indicate?

A ridge line Signup and view all the answers

What does a series of closed contours with higher values outside indicate?

A depression Signup and view all the answers

What does the line passing through a saddle and summits on contour lines show?

A watershed line Signup and view all the answers

What should be divided into smaller field subdivisions based on natural topographical boundaries in the initial plan?

Entire farm Signup and view all the answers