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Construction Activities | Section 1: Erosion & Sediment Control | 343

SWPPP Cut Sheet -1.5. Filtrexx ® Slope Interruption

Slope Percent

Maximum Slope Length Above Slope Interruption in Feet (meters)* 8 in (200 mm) Slope interruption

12 in (300 mm) Slope interruption

18 in (450 mm) Slope interruption

24 in (600 mm) Slope interruption 6.5 in (175 mm)** 9.5 in (250 mm)** 14.5 in (375 mm)** 19 in (500 mm)**

2 (or less) 600 (180) 750 (225) 1000 (300) 1300 (400) 5 400 (120) 500 (150) 550 (165) 650 (200) 10 200 (60) 250 (75) 300 (90) 400 (120) 15 140 (40) 170 (50) 200 (60) 325 (100) 20 100 (30) 125 (38) 140 (42) 260 (80) 25 80 (24) 100 (30) 110 (33) 200 (60) 30 60 (18) 75 (23) 90 (27) 130 (40) 35 60 (18) 75 (23) 80 (24) 115 (35) 40 60 (18) 75 (23) 80 (24) 100 (30) 45 40 (12) 50 (15) 60 (18) 80 (24) 50 40 (12) 50 (15) 55 (17) 65 (20)

* Based on a failure point of 36 in (0.9 m) super silt fence (wire reinforced) at 1000 ft (303 m) of slope, watershed width equivalent to receiving length of sediment control device, 1 in/ 24 hr (25 mm/24 hr) rain event.

** Effective height of Slope interruption after installation and with constant head from runoff as determined by Ohio State University.