For a homogeneous earth dam 50 m high having 2 m free broad, a flow net was constructed and the results were : Number of potential drops = 2.4 Number of flow channels = 0.4. If coefficiency of permeability of the dam mateiral is 3 x 10-3 cm3/sec, the discharge per metre length of dam, is

• 12 x 10-5 m3/sec
• 24 x 10-3 m3/sec
• 6 x 10-5 m3/sec
• 24 x 10-5 m3/sec