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Hydrodynamic Separator

This page is a source-backed entry point for the hydrodynamic-separator concept, but the live citations layer resolves it as a subtype of BMP Manual Chapter 11.3 manufactured treatment devices rather than as a standalone chapter. The page therefore treats the concept as a derived MTD application, not as its own source authority.

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

Overview

In the live source set, a hydrodynamic separator is best read as a compact non-GI treatment-device subtype within the Chapter 11.3 MTD family. The source-backed emphasis is on pretreatment and below-grade treatment function, not on GI behavior.

Source Mapping

This route is retained for site navigation, but the live citations layer flags a taxonomy or classification caution for it.

  • Route caution: Hydrodynamic separators are a type of Manufactured Treatment Device (MTD). The BMP Manual addresses MTDs in Ch. 9.5 (Small-Scale GI) and Ch. 11.3 (Non-GI). The current concept mapping page should clarify which MTD chapter applies.
  • Route type: derived
  • 2023 source bundle: Chapter 11.3 (2023_BMP_11_3) - Manufactured Treatment Devices (Non-GI MTD subtype)
  • 2026 source bundle: Chapter 11.3 (2026_BMP_11_3) - Non-GI Manufactured Treatment Devices (MTD subtype)
  • Source-basis note: Hydrodynamic separators are a type of Manufactured Treatment Device (MTD). Cite Ch. 9.5 for GI applications, Ch. 11.3 for Non-GI applications.

Key verified claims already tied to this page manifest: - Hydrodynamic separators are source-derived from Chapter 11.3 rather than from a standalone chapter. - Hydrodynamic separators stay within the Chapter 11.3 non-GI MTD family in the live source set. - Hydrodynamic-separator maintenance remains tied to the Chapter 11.3 MTD maintenance framework.

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: - Hydrodynamic separators are source-derived from Chapter 11.3 rather than from a standalone chapter. - Hydrodynamic separators stay within the Chapter 11.3 non-GI MTD family in the live source set. - Hydrodynamic-separator maintenance remains tied to the Chapter 11.3 MTD maintenance framework.

Siting Constraints

The current source-backed siting review should focus on:

  • whether the device is being used as pretreatment or as a treatment device within the Chapter 11.3 framework
  • whether access for cleanout and replacement is realistic
  • whether the page is being used to overstate GI, recharge, or broad pollutant-removal claims that the source basis does not independently prove

Maintenance

Maintenance remains unit-centered:

  • keep sediment and floatables storage from reaching ineffective levels
  • maintain access for vacuuming and inspection
  • treat neglect as a direct performance failure rather than a cosmetic issue

Source Bundles

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

  • 2023 bundle: Chapter 11.3 (2023_BMP_11_3) - Manufactured Treatment Devices (Non-GI MTD subtype)
  • 2026 bundle: Chapter 11.3 (2026_BMP_11_3) - Non-GI Manufactured Treatment Devices (MTD subtype)