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3. A canal whose bottom width is 20 m, side slopes 2:1, passing a discharge of 200 m³/s. The normal water depth is 4.0 m. The canal is lined with concrete for which 1/n = 80. Determine: i. The grade of the canal in cm/km. ii. If Q = 100 m³/s instead of 200 m³/s, find the corresponding water depth. iii. Calculate the discharge if So is doubled. iv. Calculate the discharge if n is doubled.