Sand Filter¶

Sand filters in this large-scale family are source-backed through BMP Manual Chapter 10.3. This page stays with the live Sources/* evidence model: a filtration BMP whose GI or infiltration-dependent use has to be supported by the actual configuration and the Chapter 12 evidence chain, not by the BMP label alone.

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

Overview¶

In the live source set, a Chapter 10 sand filter is a large-scale filtration BMP built around media treatment, controlled drainage, and site-specific configuration. It should not be treated as a blanket proxy for every proprietary or lined sand-filter variant.

Source Mapping¶

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

Route type: canonical
2023 source bundle: Chapter 10.3 (2023_BMP_10_3) - Sand Filters (Large-Scale GI)
2026 source bundle: Chapter 10.3 (2026_BMP_10_3) - Sand Filters (Large-Scale GI)

Key verified claims already tied to this page manifest: - Large-scale sand filters are source-backed through Chapter 10.3. - Chapter 10 sand-filter GI use remains conditional on the real Chapter 12 support chain. - Chapter 10 sand-filter maintenance stays tied to pretreatment, media condition, and drawdown.

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: - Large-scale sand filters are source-backed through Chapter 10.3. - Chapter 10 sand-filter GI use remains conditional on the real Chapter 12 support chain. - Chapter 10 sand-filter maintenance stays tied to pretreatment, media condition, and drawdown.

Siting Constraints¶

The current source-backed siting review should focus on:

whether the actual design is being presented as GI without a real Chapter 12 support chain
whether pretreatment and maintenance access are strong enough to protect the media over time
whether the site constraints point to a Chapter 10 large-scale sand filter or to a different non-GI treatment approach

Maintenance¶

Maintenance remains media-centered:

keep pretreatment and sediment interception functioning
treat clogging, crusting, and slow drawdown as direct performance problems
monitor media condition and outlet behavior as operating infrastructure

Source Bundles¶

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

2023 bundle: Chapter 10.3 (2023_BMP_10_3) - Sand Filters (Large-Scale GI)
2026 bundle: Chapter 10.3 (2026_BMP_10_3) - Sand Filters (Large-Scale GI)