A long trapezoidal channel with a roughness coefficient of 0.0 15, bottom width measuring 3. 6 m, and m = 2.0 carries a flow rate of 44 m3/sec. An obstruction is encountered in the channel that raises the water depth to 5. 8 m. If the channel slope is 0.00 I, what is the channel and flow classification (e.g., M-2, S-1) upstream of the obstruction? Explain your suppo1ting logic. Then compute the water surface profile upstream from the obstruction by finding depths at 250 m intervals until the depth is within 2 percent of normal depth. Use a spreadsheet or appropriate computer software to perform the computations. (See the book's preface for computer software suggestions.)