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Vegetated Filter Strip

Vegetated filter strips are governed by BMP Manual Chapter 9.10 in the live source corpus. This page now stays with the source-backed basics: sheet-flow treatment, inlet distribution, and the fact that the BMP is most reliable as pretreatment unless the project has specific support for any additional infiltration-based claim.

Structured citation evidence for this page lives in the sibling claim manifest.

Overview

In the enrolled source set, a vegetated filter strip is a sheet-flow treatment BMP. Its performance depends on distributed inflow across the strip rather than on concentrated point discharge.

Source Mapping

The live citations layer resolves this route directly to the following canonical source bundles.

  • Route type: canonical
  • 2023 source bundle: Chapter 9.10 (2023_BMP_9_10) - Vegetative Filter Strips
  • 2026 source bundle: Chapter 9.10 (2026_BMP_9_10) - Vegetative Filter Strips

Key verified claims already tied to this page manifest: - Vegetated filter strips stay tied to sheet-flow treatment in Chapter 9.10. - Vegetated-filter-strip performance depends on level-spread inflow distribution. - Vegetated filter strips remain primarily pretreatment and runoff-quality BMPs in the live source set.

Design Criteria

The reconciled design criteria below come from the live crosswalk and page-level claim set, not from the older narrative snapshot.

This route does not have a dedicated parameter table in the crosswalk, so the controlling criteria stay tied to the verified claims and canonical source-bundle mapping below.

Source-backed criteria that still control this route: - Vegetated filter strips stay tied to sheet-flow treatment in Chapter 9.10. - Vegetated-filter-strip performance depends on level-spread inflow distribution. - Vegetated filter strips remain primarily pretreatment and runoff-quality BMPs in the live source set.

Siting Constraints

The current source-backed siting review should focus on:

  • whether the site can actually maintain sheet flow into the strip
  • whether the slope and grading support distributed rather than channelized flow
  • whether any claimed infiltration benefit is supported by the site evidence chain instead of assumed from the vegetation alone

Maintenance

Maintenance still turns on preserving uniform flow:

  • keep the inlet/distribution feature level and clear
  • repair rills, channelization, or bare areas quickly
  • remove sediment that changes grade or blocks uniform sheet flow

Source Bundles

Use these source bundles when checking the live extracted text or paired OCR evidence:

  • 2023 bundle: Chapter 9.10 (2023_BMP_9_10) - Vegetative Filter Strips
  • 2026 bundle: Chapter 9.10 (2026_BMP_9_10) - Vegetative Filter Strips