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In-class gradually-varied flow problem (subcritical) A grouted-riprap, trapezoidal channel (n = 0.0252) with a bottom width of 4 [m] and side slopes of m = 1 carries a discharge 12.5 [cms] on a 0.001 slope. Compute the backwater curve (upstream water surface profile) created by a low dam that backs water up to a depth of 2 [m] immediately behind the dam. Numeric 1 point be What is the water depth in [m] at a distance of 1000 [m] upstream of the dam? Type your answer... Numeric 1 point What is the water surface elevation in [m] at a distance 1000 [m] upstream of the dam? (Assume here that the elevation of the channel bottom is O [m] at the dam). Type your answer... b Numeric 1 point At what distance upstream of the dam does the water depth fall within 1% of the normal depth (i.e. 0.99h,,