# Civil Engineering - Water Supply Engineering - Discussion

### Discussion :: Water Supply Engineering - Section 1 (Q.No.43)

43.

The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is

 [A]. 2 m [B]. 2.25 m [C]. 2.50 m [D]. 2.75 m [E]. 3.00 m.

Explanation:

No answer description available for this question.

 Punati said: (Aug 1, 2014) Could you please explain me to solve this problem?

 Deepli said: (Jun 19, 2015) Please solve this problem.

 Manoj said: (Aug 22, 2015) What is formula?

 Mdpawar said: (Dec 3, 2015) How to solve this problem?

 Sahil Upadhyay Ggmu said: (May 3, 2016) This can be solved by: Q = (K/A).A.H.

 Vijay said: (Jul 26, 2016) Please give the clear solution of this problem.

 Laxmipriya Dhal said: (Oct 24, 2016) @Sahil, What is the value of k?

 Ganesh Mahale said: (Nov 13, 2016) Depression head calculation from formula Q = K H Where k = 1 for course grain soil, 0.5 for fine sand and 0.25 for clay. For this case, k =1 thus, Q=3.

 Kevia said: (Nov 16, 2016) Q = (k/A) * A * H For coarse sand, k/A = 1, For fine sand, k/A = 0.5, For clay, k/A = 0.25. Q = 0.0059 m^3/sec, Q = 0.0059 * 60 * 60 m^3/hour, A = (pi/4) * d^2.

 Rama said: (Aug 25, 2017) Thanks @Kevia.

 Aks P Hi said: (Oct 31, 2017) @Kevia why did you convert it in m3/hr? Units is given in cumsec (m3/s). Answer is coming 0.050 according to formula.

 Ashley said: (Nov 2, 2017) Please explain it clearly answer is not coming according to above formula.

 Gubendhiran said: (Dec 30, 2017) Q=KiA ; i=3m; A = 0.785d^2; K=1 Q=0.0059m^3/sec=21.24m^3/hr. 21.24=1*3*0.785*d^2, d^2=(21.24)/(3*0.785)=9.0191, d=3m.

 Nani Sira said: (May 18, 2018) Why converting sec to the hour? Please explain.

 Soumyadip said: (Nov 2, 2018) @Nani. Discharge is converted to m^3/hr because. (C'/A) value is 1 in m^3/hr/m^2 under unit drawdown, Q=(C'/A) * A * s. Q=0.0059 cumec = 21.24 m^3/hr. S=3. Hence; A=7.08 m^2. D= 3.

 Shreedevi said: (May 16, 2019) Thank you for explaining.

 Akki said: (May 24, 2019) Thanks all for explaining.

 Girma said: (Aug 5, 2019) Thank you all.

 Goutom Saikia said: (Oct 2, 2019) From open well Q=kAH K is 1 /hour for coares sand Take discarge in meter cube/hour Area as cross section of circle 3.14*r2 Finally answer comes 3