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7. A discharge of 8.0 m³/s is passing in a rectangular channel of bed width 6.0 m and water depth 2.0 m. The channel bed width is gradually expanded from 6.0 m at section (1) to 8.0 m at section (2). In the expansion zone, a smooth hump is placed in the channel in which the bed level is gradually increased. Determine the change in water levels between sections (1) and (2) when the height of the hump is 1.00 m.