Q. Which factor comes into play when less permeable substratum is present?

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Q. When a canal is taken as an example what factor about it causes waterlogging?

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Q. Which factor causing waterlogging suggests extensive irrigation?

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Q. Seepage of water from the adjoining highlands causes waterlogging.

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Q. Waterlogging is the rise of water table.

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Q. The land is made to be sloped towards the ditches.

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Q. How many types of structures can be constructed in the fields to remove excess waters?

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Q. What is the name given to the drains used in depressions?

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Q. Shallow surface drains are connected to outlet drains.

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Q. What is the cross sectional shape of shallow surface drains?

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Q. Which type of open drains would be fully operative only in rainy season?

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Q. What structure is constructed to carry back into the underground?

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Q. In surface inlet what is provided to deal with trash?

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Q. Which type of drains is used for small quantity of waters removal?

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Q. For maximum productivity of crops both surface and sub-surface drains are sometimes needed.

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Q. How can tile drainage help to increase crop yields?

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Q. Tile drainage helps to reduce soil erosion.

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Q. Which type of soils is benefited by using tile drainage?

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Q. In what chemical ways does tile drainage help in plant growth?

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Q. Under what strata the tile drainage should not be placed?

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