IRRIGATION ENGINEERING QUIZ

drainage filters

drain trenches

provision of downstream berms

relief wells

All of these

Is measured as depth of water on irrigated area

May be supplied partly by precipitation and partly by irrigation

Is measured as the volume of water per unit area

increases the waterlogging area

does not change the water logging area

None of these

decreases the waterlogging area

D/3

D/5

D/2

D

remains constant

both (A) and (B)

depends on downstream apron interference and downstream submergence

depends on depth of approach and upstream slope

Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal

Minimum throat width should not be less than 60 cm

All listed here

Width of the throat should not be less than one-third of the bed width of main canal

Cumulative discharge and time

Discharge and percentage probability of flow being equaled or exceeded

Discharge and time in chronological order

Cumulative discharge, volume and time in chronological order

Difference between filed capacity and permanent wilting point within the root zone of plants

Field capacity

Saturation capacity

Moisture content at permanent wilting point

None of these

Reverse curve plus the width of the river

Reverse curve

Next curve of the same order

B = Δ (8.64 B/D)

Δ = (8.6 B/D)

D = Δ (8.64 D/B)

D = (8.6 Δ/B)