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BARC19 Hydrology & Irrigation Nuclear Quiz 2

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Question 1

Determine the field capacity (in %) of a soil for the following data:
(i) Depth of root zone = 1.8 m
(ii) Existing moisture = 8%
(iii) Dry density of soil = 1450 kg/m³
(iv) Quantity of water applied to soil = 650 m³
(v) Water lost due to deep percolation and evaporation = 10%
(vi) Area to be irrigated = 1000 m²

Question 2

Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey's theory will be___m.

Question 3

When 3.5 million m³ of water was pumped out from an unconfined aquifer of 6.3 km² areal extents, the water table was observed to go down by 2.5m. the specific yield of the aquifer is best approximated as

Question 4

The transplantation of rice requires 10 days and total depth of water required during transplantation is 48 cm. During transplantation, there is an effective rainfall (useful for irrigation) of 8 cm. The duty or irrigation water (in hectares/cumec) is:

Question 5

The normal annual rainfall at stations A, B, C and D in a basin are 80, 90, 100 and 70 cm respectively. In the year 1975, the station D was inoperative and the stations A, B and C recorded annual precipitations of 90, 75 and 80 cm respectively. Estimate the rainfall (in cm) at station D in that year

Question 6

The equilibrium discharge (in cumecs) of the S-curve derived from a 4-h unit hydrograph for this catchment, having an area of 360 km², is

Question 7

A 4-hr UH is used to derive an S-hydrograph. The coordinates of 4-hr UH are given below

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The equilibrium discharge (in m³/s) and its time of occurrence (in hour) for the derived S-hydrograph are

Question 8

A identical source of irrigation water has ion concentration of Na⁺,Ca²⁺, Mg²⁺ as 20,10 and 8 milliequivalent per litre respectively. The (Sodium Absorption Ratio) SAR of this water is

Question 9

Following data are given:
1. Available moisture holding capacity of soil=12.5cm/m depth of soil
2. Root zone depth of crop=0.8m
3. Consumptive use=5mm/day
If moisture depletion is allowed to 50% of available moisture then the frequency of irrigation will be ___days.

Question 10

The peak flow of a flood hydrograph caused by isolated storm was observed to be 120 m³/s. The storm was of 6 hours duration and had a total rainfall of 7.5 cm. If the base flow and ∅-index are assumed to be 30 m³/s and 0.25 cm/h respectively, the peak ordinate of the 6-h unit hydrograph (in m³/s) of the catchment is

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ESE & GATE CE General

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