Water flows in a rectangular channel that is \(2.0 \mathrm{~m}\) wide as shown in Fig. P3.124. The upstream depth is \(70 \mathrm{~mm}\). The water surface rises \(40 \mathrm{~mm}\) as it passes over a portion where the channel bottom rises \(10 \mathrm{~mm}\). If viscous effects are negligible, what is the flowrate?

Figure P3.124

100 mm 70 mm 10 mm