The flownet for an earthen dam with 30 m water depth consists of 25 potential drops and 5 flow channels. The conefficient of permeability of dam meterical is 0.03 mm/sec. The discharge per metre length of dam is

- 1
  
  $0.00018 m^{3} / s e c$
- 2
  
  $0.0045 m^{3} / s e c$
- 3
  
  $0.18 m^{3} / s e c$
- 4
  
  $0.1125 m^{3} / s e c$

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