Table 9. Hydraulic variables simulated by the HEC-RAS model for Great Brook near Bolton, Massachusetts [River station: River station numbers increase in an upstream direction. ft 3/s, cubic foot per second; ft, foot; ft/ft, foot per foot; ft 2, square foot; ft/s, foot per second; --, no data]
River station		Discharge (ft3/s)		Calculated water-surface altitude (ft)		Observed water-surface altitude (ft)		Critical water-surface altitude (ft)		Energy grade slope (ft/ft)		Average velocity (ft/s)		Flow area (ft2)		Top width (ft)
34	.95	0	.25	498	.07	498	.12	497	.92	0	.030702	0	.29	0	.87	6	.2
34	.95		.30	498	.08	498	.08	497	.93		.030676		.31		.98	6	.3
34	.95		.32	498	.09	498	.09	497	.93		.030682		.31	1	.02	6	.3
34	.95		.35	498	.10	498	.12	497	.94		.030692		.32	1	.08	6	.46
34	.95		.78	498	.21	498	.21	497	.99		.030726		.44	1	.78	7	.0
34	.95	1	.08	498	.24	498	.24	498	.01		.030722		.53	2	.04	7	.2
34	.95	10	.00	498	.47	498	.58	498	.35		.030686	2	.62	3	.81	9	.0
47	.93		.25	498	.19	498	.18		--		.004463		.19	1	.31	7	.0
47	.93		.30	498	.21	498	.22		--		.004606		.21	1	.44	7	.1
47	.93		.32	498	.22	498	.23		--		.004641		.21	1	.50	7	.4
47	.93		.35	498	.23	498	.25		--		.004716		.22	1	.60	7	.9
47	.93		.78	498	.34	498	.34		--		.005132		.29	2	.65	10	.4
47	.93	1	.08	498	.39	498	.40		--		.005508		.34	3	.13	10	.6
47	.93	10	.00	498	.63	498	.67		--		.003267	1	.70	5	.90	12	.4
90	.51		.25	498	.19	498	.18		--		.000019		.10	2	.57	8	.2
90	.51		.30	498	.22	498	.24		--		.000065		.11	2	.77	8	.4
90	.51		.32	498	.23	498	.24		--		.000078		.11	2	.85	8	.4
90	.51		.35	498	.24	498	.27		--		.000086		.12	2	.97	8	.6
90	.51		.78	498	.37	498	.38		--		.000239		.18	4	.29	11	.3
90	.51	1	.08	498	.43	498	.44		--		.000340		.22	4	.94	11	.8
90	.51	10	.00	498	.73	498	.71		--		.000985	1	.15	8	.68	13	.1
109	.75		.25	498	.20	498	.23	497	.94		.000494		.15	1	.71	9	.6
109	.75		.30	498	.22	498	.25	497	.95		.000438		.15	1	.96	9	.6
109	.75		.32	498	.23	498	.28	497	.95		.000419		.16	2	.06	9	.7
109	.75		.35	498	.25	498	.27	497	.95		.000398		.16	2	.20	9	.7
109	.75		.78	498	.38	498	.39	498	.00		.000373		.22	3	.50	10	.2
109	.75	1	.08	498	.43	498	.45	498	.03		.000399		.26	4	.09	10	.4
109	.75	10	.00	498	.75	498	.74	498	.34		.001434	1	.33	7	.52	11	.7
114	.57		.25	498	.20	498	.29	498	.15		.047276		.55		.45	6	.2
114	.57		.30	498	.23	498	.30	498	.16		.024331		.47		.63	6	.6
114	.57		.32	498	.24	498	.33	498	.16		.020127		.45		.71	6	.8
114	.57		.35	498	.25	498	.32	498	.17		.015827		.43		.81	7	.0
114	.57		.78	498	.38	498	.42	498	.20		.006636		.45	1	.75	7	.4
114	.57	1	.08	498	.44	498	.48	498	.22		.007031		.49	2	.19	8	.3
114	.57	10	.00	498	.74	498	.77	498	.54		.047944	1	.96	5	.11	10	.1

River station		Discharge (ft3/s)		Froude No.		Manning’s coefficient		Average depth (ft)		Hydraulic radius (ft)		Total wetted perimeter (ft)		Notes
34	.95	0	.25	0	.14	0	.240	0	.14	0	.14	6	.36	Measured discharge
34	.95		.30		.14		.240		.16		.15	6	.49	Measured discharge
34	.95		.32		.14		.240		.16		.16	6	.53	Measured discharge
34	.95		.35		.14		.240		.17		.16	6	.60	Measured discharge
34	.95		.78		.15		.230		.26		.24	7	.34	Measured discharge
34	.95	1	.08		.17		.205		.28		.27	7	.61	Measured discharge
34	.95	10	.00		.71		.053		.42		.39	9	.68	Measured discharge
47	.93		.25		.08		.169		.19		.18	7	.12	Measured discharge
47	.93		.30		.08		.164		.20		.20	7	.24	Measured discharge
47	.93		.32		.08		.162		.20		.20	7	.52	Measured discharge
47	.93		.35		.09		.158		.20		.20	8	.05	Measured discharge
47	.93		.78		.10		.143		.25		.25	10	.66	Measured discharge
47	.93	1	.08		.11		.139		.29		.29	10	.89	Measured discharge
47	.93	10	.00		.43		.030		.48		.46	12	.72	Measured discharge
90	.51		.25		.03		.030		.31		.30	8	.47	Measured discharge
90	.51		.30		.03		.052		.33		.32	8	.65	Measured discharge
90	.51		.32		.03		.055		.34		.33	8	.71	Measured discharge
90	.51		.35		.04		.056		.35		.33	8	.90	Measured discharge
90	.51		.78		.05		.065		.38		.37	11	.64	Measured discharge
90	.51	1	.08		.06		.069		.42		.40	12	.20	Measured discharge
90	.51	10	.00		.25		.030		.66		.64	13	.62	Measured discharge
109	.75		.25		.06		.070		.18		.17	9	.86	Measured discharge
109	.75		.30		.06		.069		.20		.20	9	.94	Measured discharge
109	.75		.32		.06		.068		.21		.21	9	.98	Measured discharge
109	.75		.35		.06		.068		.23		.22	10	.04	Measured discharge
109	.75		.78		.07		.061		.34		.33	10	.66	Measured discharge
109	.75	1	.08		.07		.058		.39		.37	10	.94	Measured discharge
109	.75	10	.00		.29		.030		.64		.60	12	.58	Measured discharge
114	.57		.25		.36		.100		.07		.07	6	.36	Measured discharge
114	.57		.30		.27		.100		.10		.09	6	.87	Measured discharge
114	.57		.32		.25		.100		.10		.10	7	.06	Measured discharge
114	.57		.35		.22		.100		.12		.11	7	.25	Measured discharge
114	.57		.78		.16		.100		.24		.22	7	.83	Measured discharge
114	.57	1	.08		.17		.100		.26		.25	8	.75	Measured discharge
114	.57	10	.00		.48		.100		.51		.47	10	.94	Measured discharge