Data for: Estimating Manning’s coefficient n for sheet flow during rainstorm

Published: 2 November 2022| Version 2 | DOI: 10.17632/jv6n3ph236.2
Enshuai Shen, Gang Liu


The experimental data were used to investigate and quantify the effects of rainfall on Manning’s coefficient n. 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 (particle size = 0.12 mm); and a 60 mesh water gauze bed (particle size = 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 and 0.06 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, were used to simulate rainstorms. The experimental data mainly include mean flow velocity and depth of whole flume. Flow 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 center line. The mean flow depth of the whole flume was the average of all measured points.



Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources