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Hydrology-Irrigation : Nuclear Quiz 1

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Question 1

Irrigation water through a canal is supplied to a field having Na+, Ca2+ and Mg2+ concentration as 450 mg/l , 70 mg/l and 18 mg/l respectively. What is the SAR value of the irrigation water?

Question 2

The routing expression as per Muskingham method of the channel routing is given as

Determine value of C1 considering storage constants k = 10hrs and x = 0.22 and time step Δt for routing is 6hrs

Question 3

The parameters in Horton’s infiltration equation [ft = fc + (f0 – fc) e-kt] are given as f0 = 7.32 cm/h, fc = 1.44 cm/h and K = 3.4 /h. for assumed continuous ponding, the cumulative infiltration at the end of 2 hour is

Question 4

An agricultural land of 437 ha is to irrigate for a particular crop. The base period of the crop is 90 days and the total depth of water required by crop is 105 cm, if a rainfall of 15 cm occurs during the base period, the duty of irrigation water is

Question 5

Field capacity and optimum moisture content of a soil of density 1.3 g/cc are 28% and 16% respectively. If effective depth of root zone is 70 cm, water available for e evapotranspiration is

Question 6

Consider the following statements:

(i) For a modular outlet, the flexibility is zero.

(ii) For a semi-modular outlet, the flexibility is non-zero.

(iii) An outlet is known to be sub-proportional if flexibility is more than 1

Select the correct code.

Question 7

For border strip method of irrigation 0.04 ha area is irrigated from tubewell with a discharge of 0.02 cumec. The infiltration capacity of soil may be taken as 5cm/h and the average depth of flow on the field as 10 cm. The time required to irrigate a strip of land of area 0.04 ha will be

Question 8

An isohyet is line joining points of

Question 9

What is the risk involved (in%) in the design of culvert having a useful life of 20 years, when it is designed for a flood frequency of 100 years?

Question 10

The base width of an elementary profile of a gravity dam of height H is b. The specific gravity of the material of the dam is G and uplift pressure coefficient is K. The correct relation tor no tension at the heel is given by
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Jul 22ESE & GATE CE