least cost minimum wetted perimeter minimum roughness coefficient maximum area for a given flow
Answer Discuss in Comment
between 2000 and 4000 less than 500 greater than 4000 between 500 and 2000
the total energy line, water surface and bottom of channel are all horizontal water surface and bottom of channel are parallel to each other but energy grade line is not parallel to them the total energy line, hydraulic gradient line and bottom of channel are all parallel the total energy line and water surface are horizontal but bottom of channel is inclined
0.95 0.30 0.81 0.50
specific force is maximum for a given discharge specific energy is maximum for a given discharge discharge is minimum for a given specific energy discharge is maximum for a given specific force
30° 45° 60° 75°
mild slope steep slope adverse slope critical slope
channel with a mild slope channel with a steep slope a horizontal channel all the above
greater than critical depth equal to critical depth less than critical depth imaginary
equal to unity greater than zero but less than unity less than zero equal to zero
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