# Civil Engineering - GATE Exam Questions - Discussion

### Discussion :: GATE Exam Questions - Section 1 (Q.No.30)

30.

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

Explanation:

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

 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.