Civil Engineering - Water Supply Engineering - Discussion

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.

Answer: Option E

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

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