Civil Engineering - GATE Exam Questions - Discussion


A steady discharge of 1 cumec flows uniformly in a rectangular channel 1 m wide at a depth of 250 mm. The slope of the channel bed is :

[A]. adverse
[B]. steep
[C]. critical
[D]. mild

Answer: Option A


No answer description available for this question.

Praveen said: (Jun 17, 2015)  
It should be steep slope because critical gradient is more than given depth hence its B only.

Dhawal said: (Jul 18, 2015)  
Answer should be steep, as by calculations, critical depth = 0.46 m; whereas given normal depth is 0.25 m, as critical depth>normal depth so it would be steep.

Amaresh Dhibar said: (Nov 4, 2015)  
How the calculation made 0.46?

Shail said: (Dec 12, 2015)  
Yes @Dhawal, you guys are right it is Steep yc = 0.46 and yn = 1.

Siva said: (Aug 19, 2016)  
Yeah, you guys are right, I agree with the option B.

Bala said: (Dec 25, 2016)  
How 0.46 could came?

Bhawna said: (Jan 26, 2017)  
yc = (q2/g)1/3 = 0.46.

Option B is correct because 0.25less than 0.46, critical depth is more means steep slope.

Manprit said: (Mar 1, 2017)  
Answer B is correct.(q2/g)^1/3 = 0.46, which is greater than 0.25.

Anuskha Sharma said: (Nov 22, 2017)  
Can anyone please elaborate me?

Sky said: (Feb 3, 2018)  
Yn= 1 & Yc = (q^2÷g)^1÷3.
Yc= .46.
Yn >Yc.
It is adverse slope.

Preetam Tomar said: (Feb 5, 2018)  
Steep is the correct answer.

Abc said: (Apr 5, 2018)  
Yes steep should be the correct answer as critical depth is higher than normal depth.

Type of slope ----- Relation
Mild ----- Yn>Yc
Steep ----- Yn<Yc
critical ----- Yn=Yc
Adverse ----- Slope<0
Horizontal ----- Slope=0.

Where Yn & Yc are normal and critical depth.

Bhutan said: (Aug 31, 2019)  
It should be Steep.

Sadashiva said: (Sep 15, 2019)  
Yc = ((q^2/g))^(1/3) q=Q/B, q=1/1=1.
Yc = ((1 /9.81))^(1/3).
Yc = 0.467m.

Given Yn = 250mm = 0.25m.

Condition when, yc>yn(steep slope).
So, the answer is option B.

Nayab said: (Sep 24, 2020)  
Calculate the slope of bed if it's less than zero it's adverse.

Kshitij said: (Sep 25, 2020)  
How to calculate the bed slope? Please explain.

Dixita said: (Oct 23, 2020)  
How to find yn when S is not known? 0.25m is not yn, right? Anyone, please explain in detail.

Bisy said: (Dec 23, 2020)  
Thanks @Sadashiva.

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