Civil Engineering - Water Resources Engineering - Discussion

33. 

From the Survey of India map, the distance of the critical point is 20 km and difference in elevation is 193 m. The over land flow time, is

[A]. 2 hours
[B]. 3 hours
[C]. 2 hours and 30 minutes
[D]. 3 hours and 30 minutes
[E]. 4 hours.

Answer: Option E

Explanation:

No answer description available for this question.

Murali Krishna said: (Jun 8, 2014)  
Why it is 4 hours is it standard or any calculation is there?

Gopal Dev Sharma said: (Jul 4, 2014)  
I guess, over land time duration:

= ( 0.885 *L^3 / h )^0.385.
= ( 0.885 *20^3 / 193 ) ^ 0.385.
= ( 36.68 ) ^ 0.385.
= 4.002 ~ 4 hours.

Note : I'm not sure If It Is correct ... Let me know if it is.

Srinu said: (Oct 14, 2016)  
@Gopal.

Is this formula correct& how did you get this? Are you sure?

Mughal Saltanat said: (Dec 4, 2016)  
T = (0.885 L^3/H)^0.385

Subhadeep Mandal said: (May 24, 2017)  
This mathematical approach is based on Kirpich Equation (1940).

Tc (in minute) =[ 0.01947*(L^0.77) * ((h/L)^-0.385)],
h = 193 m,
L = 20000 m,
Tc = 238.29 min ~ 3.97 hr ( ~ 4 hr.).

Akhilesh Yadav said: (Jun 9, 2017)  
Kirpich Time Of Concentration.

Watershed Hydrology Equations Formula:-

Time of concentration (tc)=.0078{(L^.77)/(S^.385)}.
Where- S=193/20000=.00965.
Travel length (L)= 20000meter = 65616.797900262 foot,
Slope (S)= 0.00965.
Time of concentration (tc)=.0078{(20000^.77)/(.00965^.385)},
Time of concentration (tc)= 238.31597891773minute,
Time of concentration (tc)=3.97193298197hour.

Vjay said: (Aug 21, 2020)  
I am not getting this, please anyone explain this in detail.

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