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

View solution

Q. Shallow surface drains are connected to outlet drains.

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Tile drainage helps to reduce soil erosion.

View solution

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

View solution

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

View solution

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

View solution

Q. What structure is surrounded around the tile drains when used in less pervious strata?

View solution

Q. What is the size of the tile at an outlet of a 12 hectare drainage system, if the D.C is 2 cm and the tile grade is 0.5%. Assume the rugosity coefficient as 0.015 for the tile drain material.

View solution

Q. Which type of alternate layouts system for tile drainage has two mains?

View solution

Q. How many cubic metres of water will be removed for this particular period of a system designed to use a D.C of 1.5 cm draining 20 hectares for a capacity of 5 days?

View solution

Q. Which among the following salt is also called black alkali?

View solution

Q. Which is the least harmful salt for agricultural soil?

View solution

Q. The plant roots act as a semi-permeable membrane.

View solution