Experimental and Numerical Investigation of Flow Measurement Mechanism and Hydraulic Performance of Portable Pillar-Shaped Flumes in Rectangular Channels

Table 3

Comparison of the measured and calculated flow rates at different contraction ratios.

ε	H (cm)	Q1 (L/s)	Q2 (L/s)	(%)
0.4	8.18	5.04	5.20	3.32
	10.18	7.03	7.31	4.07
	12.03	9.06	9.48	4.74
	13.60	11.14	11.48	3.06
	15.08	12.94	13.48	4.16
	16.46	15.17	15.45	1.88
	17.71	17.08	17.32	1.36
	18.92	18.97	19.19	1.16
	20.01	21.01	20.94	0.35
	21.31	23.06	23.10	0.18
	22.18	25.14	24.58	2.22
	23.20	27.03	26.36	2.46
0.5	6.91	5.03	4.94	1.82
	8.65	7.04	7.01	0.55
	10.18	9.07	9.03	0.44
	11.53	11.12	10.96	1.43
	12.75	12.94	12.82	1.00
	13.98	15.15	14.79	2.37
	15.19	17.05	16.83	1.27
	16.25	18.97	18.69	1.45
	17.18	21.05	20.39	3.16
	18.41	23.08	22.70	1.64
	19.31	25.06	24.45	2.40
	20.18	27.08	26.19	3.30
0.6	6.22	5.02	4.98	0.85
	7.71	7.03	6.96	0.98
	9.10	9.07	9.00	0.75
	10.32	11.15	10.95	1.75
	11.52	13.00	13.00	0.02
	12.48	15.14	14.72	2.79
	13.61	17.05	16.85	1.20
	14.71	19.01	19.02	0.04
	15.57	21.02	20.77	1.18
	16.56	23.03	22.87	0.70
	17.44	25.08	24.78	1.19
	18.37	27.04	26.87	0.62