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Blue Roof

Blue roofs in the live source corpus are governed by BMP Manual Chapter 11.1. This page now stays with that source-backed center of gravity: a non-GI rooftop storage BMP used for controlled release, not for infiltration, recharge, or automatic GI credit.

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

Overview

In the live source set, a blue roof is a rooftop detention concept built around temporary storage and controlled roof-drain release. The important source-backed distinction is that it remains a non-GI quantity-control tool rather than a volumetric-reduction BMP.

Source Mapping

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

  • Route type: canonical
  • 2023 source bundle: Chapter 11.1 (2023_BMP_11_1) - Blue Roofs
  • 2026 source bundle: Chapter 11.1 (2026_BMP_11_1) - Blue Roofs

Key verified claims already tied to this page manifest: - Blue roofs are source-backed through Chapter 11.1. - Blue roofs remain non-GI storage-and-release BMPs in the live source set. - Blue-roof maintenance stays tied to drains, overflow protection, and roof condition.

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: - Blue roofs are source-backed through Chapter 11.1. - Blue roofs remain non-GI storage-and-release BMPs in the live source set. - Blue-roof maintenance stays tied to drains, overflow protection, and roof condition.

Siting Constraints

The current source-backed siting review should focus on:

  • whether the roof structure and drainage layout can safely support controlled ponding
  • whether the project is trying to over-claim blue-roof use as GI or recharge
  • whether maintenance access and overflow protection are realistic for the building

Maintenance

Maintenance remains rooftop-control-centered:

  • keep controlled drains and overflow paths functioning
  • monitor roof condition and ponding behavior after storms
  • treat clogging and slow release as operating risks, not minor housekeeping issues

Source Bundles

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

  • 2023 bundle: Chapter 11.1 (2023_BMP_11_1) - Blue Roofs
  • 2026 bundle: Chapter 11.1 (2026_BMP_11_1) - Blue Roofs