Irrigation Engineering

31) Available soil moisture is the difference between

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field capacity and permanent wilting point

32) The field capacity of an irrigation soil depends on

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both porosity and pore size

33) The moisture content of the soil below which plants cannot extract sufficient water for their requirements is called

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permanent wilting point

34) The average Δ of rice crop is nearer to

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120 cm

35) The depth of root zone for rice is generally about

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12 cm

36) If the resultant falls outside the middle third for reservoir full condition the gravity dam may fail due to

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tension

37) The bed of the canal is lowered in the case of

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canal syphon

38) If the electrical conductivity of water is in between 250 to 750 micro mhos/cm at 25oC, then it is classified as

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medium sodium water

39) Irrigation water having the concentration of Na++, Ca++ and Mg++ as 20, 3 and 1 milli-equivalent per litre respectively will be classified as

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medium sodium water

40) The value of Sodium Absorption Ratio for high sodium water lies between

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18 to 26

Subject Notes

Objective Box

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