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Erosion-Control Quantities

Tallies erosion & sediment-control quantities from objects on the ESC layers: total disturbed acreage, linear items (LF) and count items (EA), and compares the disturbed area to the NPDES permit trigger .

Command VDCESC · VDC Sheets tab › Sheets + Takeoff panel
Tallies erosion & sediment-control quantities from objects on the ESC layers: total disturbed acreage, linear items (LF) and count items (EA), and compares the disturbed area to the NPDES permit trigger.
Sum disturbed area (AC) + linear (LF) + counts (EA); flag when AC ≥ NPDES threshold. LIMITS OF DISTURBANCE (LOD) disturbed = 1.42 AC Silt fence (perimeter) → 1,540 LF Tree-prot fence CE 1 EA IP IP Inlet protection → 2 EA NPDES check threshold = 1.00 AC disturbed = 1.42 AC ≥ threshold → PERMIT/SWPPP below → note: confirm local ESC Quantities.csv Disturbed area .... 1.42 AC Silt fence ........ 1,540 LF Tree-prot fence ... 610 LF Constr. entrance .. 1 EA Inlet protection .. 2 EA NPDES: permit required
Limits of disturbance / flag   Silt fence (LF)   Tree-protection fence (LF)   Inlet protection (EA)   Construction entrance (EA)

What it does, per run

  • Disturbed area: sums closed polylines + hatches on the disturbance layers (e.g. LOD, LDA, DISTURB), converted to acres.
  • Linear items: sums silt fence, tree-protection fence, diversion ditch by layer → LF.
  • Count items: counts construction entrances, inlet protection by layer → EA.
  • NPDES check: compares total disturbed acreage to NpdesAcreThreshold; at or above it, reports the permit/SWPPP requirement, below it a note to confirm local thresholds.
  • Layer→item matching is a whole-token match on the layer name (word-boundary, not a raw substring) against each LayerContains entry.

Outputs & settings

  • CSV: <drawing> - ESC Quantities.csv, quantity lines plus the NPDES finding; only written when the drawing is saved to a real path.
  • Palette: findings palette carries the NPDES disturbed-area finding.
  • Env var VDC_ESC_SETTINGS, default %APPDATA%\VDC\Esc\settings.json; schema-tolerant load.
  • Settings hold the NPDES threshold (default 1.0 ac) and the disturbed / linear / count layer→item maps.
  • Federal CGP triggers at 1.0 ac; some jurisdictions are stricter, set the threshold for your locale.

Dialog

Erosion-Control Quantities dialog
Erosion-Control Quantities, VDCESC

When to use it

  • Building an ESC quantity tally and confirming whether the disturbed area trips the NPDES permit threshold.

How to run it

  1. Run VDCESC; set the NPDES disturbed-area threshold (default 1.0 ac) and click OK.
  2. The tool scans the ESC layers for disturbed-area regions, linear items, and count items.
  3. Read the quantity tally; check the palette for the NPDES disturbed-area finding.

Options

  • Disturbed area (AC): from the LOD / LDA / disturbed-area layers; flagged when total >= the threshold.
  • Linear (LF): silt fence, tree-protection fence, diversion ditch.
  • Counts (EA): construction entrances, inlet protection.

Watch out for

  • Federal CGP triggers at 1.0 ac, but some jurisdictions are stricter - set the threshold for your locale.
  • Layer-to-item maps live in settings.json; matching is substring-based (e.g. 'SILT' matches any layer containing it).
  • The CSV is only written when the drawing is saved to a real path.

Related: Quantity Takeoff · Standards QC · QC Status