In Figure P6.8.9, a 10-m-wide rectangular channel carries 16 .0 m3/sec and has a roughness coefficient of 0.01 5 and a slope of 0.0016. If a 5-m high dam is placed across the channel raising the water depth to 5. 64 mat a location 5. 0 m upstream from the dam, what is the channel and flow classification (e.g., M-2, S-1)? Explain your supporting logic. Then determine the water surface profile upstream from the dam by finding the depth of flow at distances of 300 m, 900 m, 1,800 m, an:! 3, (}00 m upstream. Use a spreadsheet or appropriate computer software to pe1iorm the computations (See the book's preface for computer software suggestions.)

5 mp So# 0.0016 Figure P6.8.9