# Civil Engineering - Waste Water Engineering - Discussion

### Discussion :: Waste Water Engineering - Section 1 (Q.No.16)

16.

If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

 [A]. 2 hours [B]. 3 hours [C]. 4 hours [D]. 5 hours.

Answer: Option C

Explanation:

No answer description available for this question.

 Abhi said: (Mar 22, 2016) Ti = [0.885 L^3/H]^0.385. Where Ti = inlet time in hrs. L = overland flow in KM. L = 8KM. H = 12.4m. Therefore, Ti = 3.999 say 4hrs.

 Yogesh said: (Jul 21, 2016) Thanks @Abhi.

 Amit said: (Aug 20, 2016) Thanks @Abhi.

 Ronnie said: (Aug 23, 2016) Thanks @Abhi.

 Ansari Jawed said: (Sep 29, 2016) Thanks @Abhi.

 Srinu said: (Oct 17, 2016) Thanks for your solution @Abhi.

 Niranjan said: (Nov 21, 2016) Thank you very much @Abhi.

 Adhi said: (Dec 23, 2016) Can you please tell me, Wher does you got that formula? @Abhi.

 Ali said: (Dec 29, 2016) Thank you very much @Abhi.

 Suroliya said: (Mar 22, 2017) Thanks @Abhi.

 Zain said: (Jul 28, 2017) Thanks @Abhi.

 Negussie said: (Sep 11, 2017) Thanks @Abhi.

 Skumar said: (Oct 18, 2017) Thanks @Abhi.

 Ganesh said: (Nov 27, 2017) Thanks @Abhi.

 Balu Naik said: (Dec 1, 2017) Thanks @Abhi.

 Vinay said: (Jan 7, 2018) Thanks @Abhi.

 Shubh said: (Mar 19, 2018) Thankyou @Abhi.

 Priya said: (Mar 24, 2018) Why L in km and h in m? Please explain.

 R.P said: (Mar 25, 2018) @Adhi. That is Kirpich's formula, you will use in hydrology.

 Civilian said: (Apr 30, 2018) This is the standard result @Priya.

 Usha said: (Jul 12, 2018) Please explain the answer.

 Jaysukh Parmar said: (Jul 26, 2018) Here, The potential Energy=m.g.h so, h=12.4 m. we can consider 1/2 *12.4=0.5, 0.5 m/sec under force of gravity run, 60*60=3600 sec*0.5 m/sec=1800 m. 1800/1000=1.8 km/hr. Here 8 km/1.8 km/hr. Ans. 4.44 hr. can say 4 hours.

 Jaysukh Parmar said: (Jul 27, 2018) We can consider break up- 1/2*12.4= 6.2, standard water velocity is 3 m/sec so that 6/3 =0.5 m/sec.

 Raaj said: (Aug 19, 2018) Thanks All for explaining the answer.

 Taibaimtiaz said: (Oct 5, 2018) @Jaysukh. Are you comparing potential energy with kinertienergy? How come 1/2 fraction is there? please explain.

 Ashish said: (Dec 2, 2018) It should be 3, here's why Formula T = 0.0078 * L^.77 ÷ H^.385. BY putting the value of L&H we can calculate, The value of T, T=2.99=3.

 Patil said: (Mar 20, 2019) Thanks for explaining it @Ashish.

 Harish N said: (Apr 3, 2019) Kirpichs formula can also be used like this; Tc= (0.00032L^0.77 )/S^0.385. Tc= Time of concentration ( hr). L= Maximum length of travel (m). S= slope, H/L. By using this formula we can get the correct answer, and km is converted into m.

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