Data for: Effects of surface roughness on sheet flow resistance induced by rainfall

The experimental data were used to investigate and quantify the effects of surface roughness on sheet flow resistance induced by rainfall.Experimental setup: the flume was 6.0 m long, 0.25 m wide, and 0.3 m deep. The bed of the flume was impervious. Three different bed surfaces were used: a smooth surface (equivalent roughness = 0.009 mm); a 120 mesh gauze bed (equivalent roughness = 0.12 mm); and a 60 mesh water gauze bed (equivalent roughness = 0.25 mm). Two sets of flume experiments, namely, upstream-inflow-alone experiments and upstream-inflow-with-rainfall experiments, were designed. In upstream-inflow-alone experiments, three constant inflow discharges (0.02, 0.04, 0.06, 0.08 and 0.1 m2 min-1) and three kinds of bed surfaces were designed to simulate SF under different surface conditions. In upstream-inflow-with-rainfall experiments, five rainfall intensities, 40, 60, 80, 100, and 120 mm h-1, were used to simulate rainstorms. The experimental data mainly include average flow velocity and water depth of whole flume. Water depth was measured in each 1 m by using a water level measuring needle. There were six observation points for measuring flow depth, positioned at 0.5, 1.5, 2.5, 3.5, 4.5, 5.5 m along the flume centreline. The mean water depth of the flume was the average of all measured points