Silt fence layout and quantity
Rows of silt fence needed on a slope, total length, stakes and rolls, and a drainage-area check.
Get this tool with its role plan
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Comes with the foreman and site lead plan: every tool for the role, from $10.20 a month at the launch price.
- Your own numbers, worked out as often as you like
- The full silt fence sheet you can print or save to My work
- 3 cited sources, linked, with the checks to make
- Every other tool for the same role, in the same plan
- A plain-words read of your result (a fuller AI read with the Bifrost AI add-on)
Included in these role plans
Example result · fictional numbers
What you get: silt fence sheet
Worked out by this tool from its default inputs. Its role plan lets you run your own numbers, print the sheet and save it.
3 rows, 1,350 ft of fence, 27 inspections over 6.0 months, $4,725.00 to install and remove
- Maximum slope length per row
- 50 ft
- Rows of fence
- 3
- Total fence
- 1,350 ft → 14 rolls of 100 ft
- Stakes
- 228
- Drainage-area check
- OK (≤ 1/4 acre per 100 ft of fence)
Layout on the slope
- Row 1
- at the toe, below the disturbed area: 450 ft along the contour
- Row 2
- 40 ft up the slope from row 1, 450 ft long
- Row 3
- 80 ft up the slope from row 1, 450 ft long
- Row spacing
- 40 ft (no more than 50 ft of slope above any row at 6.0%)
Also on the sheet
- Install sheet · 6 lines, starting with “Fabric”
- Inspection and maintenance · 4 lines, starting with “Schedule”
- Cost sheet · 3 lines, starting with “Install”
The plain-words read of this example
At 6.0% over 120 ft of slope you need 3 rows of 450 ft, 1,350 ft of fence in 14 rolls with 228 stakes. The 1.00 acres draining to it is within the 1/4 acre per 100 ft limit. Plan 27 inspections over 6.0 months and clean out sediment before it reaches 12 in, half the fence height. Install and removal come to about $4,725.00. Your approved SWPPP and state permit govern over this sheet.
3 cited sources
- 2022 Construction General Permit (CGP) (US Environmental Protection Agency)
- National Menu of Best Management Practices for Stormwater: Construction (silt fence) (US Environmental Protection Agency)
- Stormwater discharges from construction activities (US Environmental Protection Agency)
Plus 5 step-by-step checks, a print layout and a link that reopens it with your numbers.