The average velocity (V) and depth of flow (d)in a channel reach are measured, as shown in the following table, during four storm events.The trapezoidal reach has a bottom width of 15 ft, side slopes of 2.5:1 (h:v),and a bottom slope of 0.008. Mean velocity measurements are assumed to be accurate to ±107%, and the depth has an expected accuracy of ±0.3 ft. What is the best estimate of n and what is its expected accuracy?
Storm Event | Velocity (ft/sec) | Depth (ft) |
1 | 4.6 | 3.2 |
2 | 5.7 | 3.9 |
3 | 4.9 | 3.4 |
4 | 6.2 | 4.1 |
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