If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

Irrigation Engineering
If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

t = (h + 1)/(G + t)

t = (h - 1)/(G - t)

t = (h + 1)/G

t = (h - 1)/(G + t)

t = (h + 1)/(G + t)

t = (h - 1)/(G - t)

t = (h + 1)/G

t = (h - 1)/(G + t)

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Irrigation Engineering
The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after

250 years

50 years

200 years

150 years

250 years

50 years

200 years

150 years

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Irrigation Engineering
Lining of irrigation channels

does not change the water logging area

None of these

increases the waterlogging area

decreases the waterlogging area

does not change the water logging area

None of these

increases the waterlogging area

decreases the waterlogging area

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Irrigation Engineering
An artesian aquifer is the one where

water surface under the ground is at atmospheric pressure

water table serves as upper surface of zone of saturation

water is under pressure between two impervious strata

None of these

water surface under the ground is at atmospheric pressure

water table serves as upper surface of zone of saturation

water is under pressure between two impervious strata

None of these

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Irrigation Engineering
To determine the discharge at a section in a stream from its rating curve, the required data are
i) slope of water surface at the section
ii) stage at the section
iii) current meter readings at the section
The correct answer is

(i) and (ii)

only (iii)

(ii) and (iii)

only (ii)

(i) and (ii)

only (iii)

(ii) and (iii)

only (ii)

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Irrigation Engineering
If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by

B = 0.44 √(H + d)

B = 0.22 √(H + d)

B = 0.55 √(H + d)

B = 0.33 √(H + d)

B = 0.44 √(H + d)

B = 0.22 √(H + d)

B = 0.55 √(H + d)

B = 0.33 √(H + d)

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Irrigation Engineering

Irrigation Engineering If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

Irrigation Engineering The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after

Irrigation Engineering Lining of irrigation channels

Irrigation Engineering An artesian aquifer is the one where

Irrigation Engineering To determine the discharge at a section in a stream from its rating curve, the required data arei) slope of water surface at the sectionii) stage at the sectioniii) current meter readings at the sectionThe correct answer is

Irrigation Engineering If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by

Irrigation Engineering
If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

Irrigation Engineering
The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after

Irrigation Engineering
Lining of irrigation channels

Irrigation Engineering
An artesian aquifer is the one where

Irrigation Engineering
To determine the discharge at a section in a stream from its rating curve, the required data are
i) slope of water surface at the section
ii) stage at the section
iii) current meter readings at the section
The correct answer is

Irrigation Engineering
If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by