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Vegetated Filter Strip System Design Manual
Design Guidelines of VFS System Components

Author: Robert P. Stone, P. Eng., Engineer, Soil/OMAFRA
Creation Date: 04 July 2005
Last Reviewed: 29 March 2007
| Introduction and Background | General Design Guidance for VFS System Components |
| Design Guidelines of VFS System Components |
| Design Guide | Case Studies | Design Tables | Appendix |

Table 3.1 Orifice Discharge Capacity

Orifice Diameter
(in)		 Orifice
Area
(ft2)		 Discharge Capacity at Specific Head (m)
0.05
(gal/min.) 		0.1
(gal/min.) 		0.2
(gal/min.) 		0.3
(gal/min.) 		0.4
(gal/min.)
0.39
0.00
 1.10 1.55 2.20 2.69 3.11
0.79
0.00
 4.39 6.21 8.79 10.76 12.43
1.18
0.01
 9.88 13.98 19.77 24.21 27.96
1.57
0.01
 17.57 24.85 35.14 43.04 49.70
1.97
0.02
 27.46 38.83 54.91 67.25 77.66
2.36
0.03
 39.54 55.91 79.07 96.84 111.83
2.76
0.04
 53.81 76.10 107.63 131.82 152.21
3.15
0.05
 70.29 99.40 140.57 172.17 198.80
3.54
0.07
 88.96 125.80 177.91 217.90 251.61
3.94
0.08
 109.82 155.31 219.65 269.01 310.63
4.33
0.10
 132.89 187.93 265.77 325.51 375.86
4.72
0.12
 158.15 223.65 316.29 387.38 447.31
5.12
0.14
 185.60 262.48 371.21 454.63 524.96
5.51
0.17
 215.26 304.42 430.51 527.27 608.83
5.91
0.19
 247.10 349.46 494.21 605.28 698.92
6.30
0.22
 281.15 397.61 562.30 688.67 795.21
6.69
0.24
 317.39 448.86 634.78 777.45 897.72
7.09
0.27
 355.83 503.22 711.66 871.60 1006.44
7.48
0.31
 396.46 560.69 792.93 971.14 1121.37
7.87
0.34
 439.30 621.26 878.59 1076.05 1242.52
8.27
0.37
 484.32 684.94 968.65 1186.35 1369.87
8.66
0.41
 531.55 751.72 1063.10 1302.02 1503.45
9.06
0.45
 580.97 821.61 1161.94 1423.08 1643.23
9.45
0.49
 632.59 894.61 1265.17 1549.51 1789.22
9.84
0.53
 686.40 970.72 1372.80 1681.33 1941.43
10.24
0.57
 742.41 1049.93 1484.82 1818.53 2099.85
10.63
0.62
 800.62 1132.24 1601.23 1961.10 2264.49
11.02
0.66
 861.02 1217.67 1722.04 2109.06 2435.33
11.42
0.71
 923.62 1306.20 1847.24 2262.40 2612.39
11.81
0.76
 988.42 1397.83 1976.83 2421.12 2795.66
12.20
0.81
 1055.41 1492.57 2110.82 2585.21 2985.15
12.60
0.87
 1124.60 1590.42 2249.20 2754.69 3180.84
12.99
0.92
 1195.98 1691.38 2391.97 2929.55 3382.75
13.39
0.98
 1269.57 1795.44 2539.13 3109.79 3590.87
13.78
1.04
 1345.34 1902.60 2690.69 3295.41 3805.21
14.17
1.10
 1423.32 2012.88 2846.64 3486.41 4025.75
14.57
1.16
 1503.49 2126.26 3006.98 3682.79 4252.51
14.96
1.22
 1585.86 2242.74 3171.72 3884.54 4485.49
15.35
1.29
 1670.42 2362.34 3340.85 4091.68 4724.67
15.75
1.35
 1757.18 2485.03 3514.37 4304.20 4970.07

Using equation Q = (C)(A)(2gh)0.5, with the following variables: Q = Orifice discharge, C = Orifice constant = 0.61 (varies by type of orifice, value considered conservative), A = Orifce Area m2, g = 9.8 m/s2, h = Head of Orifice m

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| Introduction and Background | General Design Guidance for VFS System Components |
| Design Guidelines of VFS System Components |
| Design Guide | Case Studies | Design Tables | Appendix |

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