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2. Estimate the normal depths in channels having the following sections if Q = 40 m³/s, S = 10 cm/km, and n = 0.025: i. A rectangular section with 10.0 m width. ii. A triangular section with side slopes 1:1 iii. A trapezoidal section with bottom width 10.0 m and side slopes 2:1. iv. A circular section with 10.0 m diameter.