BMP Crosswalk — 2023 vs. 2026¶
Generated: 2026-03-12 Phase: 1 — Chapters 9–11 (BMP Library Pages)
Summary¶
| Item | Count |
|---|---|
| BMP entries | 26 |
| Parameters tracked | 30 |
| Verified from PDF | 47 |
| Unverified | 13 |
| Errors in register | 11 |
| Classification issues | 9 |
Verification progress: 78% (47/60 era-parameter slots confirmed)
Values with
verified: falsehave not been confirmed against OCR source PDFs.
Library Classification Issues¶
| Library Page | Library Chapter | Manual Chapter | Issue |
|---|---|---|---|
| subsurface-gravel-wetland.md | ch9-small-scale-gi | 11.5 | Subsurface Gravel Wetlands are classified in the BMP Manual under Ch. 11 (Non-GI). The library places them in Ch. 9 (Sm… |
| extended-detention.md | ch10-large-scale-gi | 11.2 | Extended Detention Basins are classified in the BMP Manual under Ch. 11 (Non-GI). The library places them in Ch. 10 (La… |
| rain-garden.md | ch9-small-scale-gi | — | Rain Garden is not a separate BMP Manual chapter. It is a lay term for small-scale bioretention (Ch. 9.7). All design c… |
| tree-trench.md | ch9-small-scale-gi | — | Tree Trench / Tree Box Filter is not a separate BMP Manual chapter in 2023 or 2026. It draws from 9.7 (small-scale bior… |
| hydrodynamic-separator.md | ch11-non-gi | 9.5 or 11.3 | Hydrodynamic separators are a type of Manufactured Treatment Device (MTD). The BMP Manual addresses MTDs in Ch. 9.5 (Sm… |
| oil-grit-separator.md | ch11-non-gi | 9.5 or 11.3 | Oil/Grit Separators are a type of Manufactured Treatment Device (MTD). Same as hydrodynamic separators — should cite Ch… |
| membrane-system.md | ch11-non-gi | — | Membrane systems are not a standalone BMP Manual chapter. May derive from Ch. 11.4 Sand Filters With Underdrain or spec… |
| dry-detention.md | ch11-non-gi | 11.2 | Dry detention (extended detention without wet pool) is likely a variant of Ch. 11.2 Extended Detention Basins. There is… |
| underground-detention.md | ch11-non-gi | — | Underground detention (subsurface storage) is not a standalone BMP Manual chapter. May derive from Ch. 11.2 Extended De… |
Parameter Crosswalk by BMP¶
bioretention¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/bioretention.md
Type: direct
2023 source: Small-Scale Bioretention Systems (BMP Manual §9.7, doc: 2023_BMP_9_7)
2026 source: Small-Scale Bioretention Systems (BMP Manual §9.7, doc: 2026_BMP_9_7)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Contributing drainage area | ≤ 2.5 acres | ≤ 2.5 acres | unchanged | 2023:✓ 2026:✓ | E-03 |
| Maximum ponding depth | 12 in | 12 in | unchanged | 2023:✓ 2026:✓ | |
| Typical ponding depth | 6 in | 6 in | unchanged | 2023:✓ 2026:✓ | |
| Engineered media depth | 18–48 in | 18–48 in | unchanged | 2023:✓ 2026:✓ | |
| Filter media composition | 60% sand / 20% topsoil / 20% compost | 60% sand / 20% topsoil / 20% compost | unchanged | 2023:✓ 2026:✓ | |
| Drawdown time | ≤ 72 hours | ≤ 72 hours (24–48 hrs preferred) | unchanged | 2023:✓ 2026:✓ | |
| Underdrain required when | Ksat < 0.5 in/hr or HSG C/D soils | Ksat < 0.5 in/hr or HSG C/D soils | unchanged | 2023:✓ 2026:✓ | |
| SHWT separation | 2 ft below bottom of media — measured from static SHWT | 2 ft below bottom of media — measured from static SHWT | unchanged | 2023:✓ 2026:✓ | E-09 |
| K_design calculation | K_design = K_field ÷ 2.0 (factor of safety = 2.0) | K_design = K_field ÷ 2.0 (factor of safety = 2.0) | unchanged | 2023:✓ 2026:✓ | E-10 |
| Pretreatment required | Required | Required | unchanged | 2023:✓ 2026:✓ |
dry-well¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/dry-well.md
Type: direct
2023 source: Dry Wells (BMP Manual §9.2, doc: 2023_BMP_9_2)
2026 source: Dry Wells (BMP Manual §9.2, doc: 2026_BMP_9_2)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Minimum Ksat (field-measured) | ≥ 0.5 in/hr | ≥ 0.5 in/hr | unchanged | 2023:✓ 2026:✓ | E-04 |
| SHWT separation | 2 ft below dry well bottom — measured from static SHWT | 2 ft below dry well bottom — measured from static SHWT | unchanged | 2023:✓ 2026:✓ | E-09 |
| Drawdown time | ≤ 72 hours | ≤ 72 hours | unchanged | 2023:✓ 2026:✓ | |
| Foundation setback | ≥ 10 ft | ≥ 10 ft | unchanged | 2023:✓ 2026:✓ | |
| Septic system setback | ≥ 10 ft | ≥ 10 ft | unchanged | 2023:✓ 2026:✓ | |
| Required infiltration test method | Primary: percolation test, tube permeameter, single ring in… | Primary: percolation test, tube permeameter, single ring in… | unchanged | 2023:✓ 2026:✓ | E-06 |
| K_design calculation | K_design = K_field ÷ 2.0 (factor of safety = 2.0) | K_design = K_field ÷ 2.0 (factor of safety = 2.0) | unchanged | 2023:✓ 2026:✓ | E-10 |
cistern¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/cistern.md
Type: direct
2023 source: Cisterns (BMP Manual §9.1, doc: 2023_BMP_9_1)
2026 source: Cisterns (BMP Manual §9.1, doc: 2026_BMP_9_1)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Storage capacity / sizing method | — | — | unknown | 2023:⏳ 2026:⏳ | |
| Chapter 14 volumetric reduction credit | N/A — Ch. 14 did not exist | Cistern + reuse system may qualify for volumetric reduction… | new | 2023:✓ 2026:✓ |
grass-swale¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/grass-swale.md
Type: direct
2023 source: Grass Swales (BMP Manual §9.3, doc: 2023_BMP_9_3)
2026 source: Grass Swales (BMP Manual §9.3, doc: 2026_BMP_9_3)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Maximum side slope | — | — | unknown | 2023:⏳ 2026:⏳ | |
| Maximum longitudinal slope | — | — | unknown | 2023:⏳ 2026:⏳ |
green-roof¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/green-roof.md
Type: direct
2023 source: Green Roofs (BMP Manual §9.4, doc: 2023_BMP_9_4)
2026 source: Green Roofs (BMP Manual §9.4, doc: 2026_BMP_9_4)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Growing media depth (extensive) | — | — | unknown | 2023:⏳ 2026:⏳ | |
| Volumetric reduction credit (Ch. 14) | ET credit method (no Ch. 14) | ET credit method via Ch. 14; cistern/reuse required to qual… | modified | 2023:⏳ 2026:✓ |
infiltration-basin¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/infiltration-basin.md
Type: direct
2023 source: Small-Scale Infiltration Basins (BMP Manual §9.8, doc: 2023_BMP_9_8)
2026 source: Small-Scale Infiltration Basins (BMP Manual §9.8, doc: 2026_BMP_9_8)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Minimum Ksat | — | — | unknown | 2023:⏳ 2026:⏳ | |
| SHWT separation | 2 ft — measured from static SHWT | 2 ft — measured from static SHWT | unchanged | 2023:✓ 2026:✓ | E-09 |
| K_design calculation | K_design = K_field ÷ 2.0 (factor of safety = 2.0) | K_design = K_field ÷ 2.0 (factor of safety = 2.0) | unchanged | 2023:✓ 2026:✓ | E-10 |
pervious-pavement¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/pervious-pavement.md
Type: direct
2023 source: Pervious Paving Systems (BMP Manual §9.6, doc: 2023_BMP_9_6)
2026 source: Pervious Paving Systems (BMP Manual §9.6, doc: 2026_BMP_9_6)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Storage void ratio | — | Maximum 0.40 | unknown | 2023:⏳ 2026:⏳ | |
| SHWT separation | Measured from static SHWT | Measured from static SHWT | unchanged | 2023:✓ 2026:✓ | E-09 |
rain-garden¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/rain-garden.md
Type: derived
2023 source: Small-Scale Bioretention Systems (lay term: rain garden) (BMP Manual §9.7, doc: 2023_BMP_9_7)
2026 source: Small-Scale Bioretention Systems (lay term: rain garden) (BMP Manual §9.7, doc: 2026_BMP_9_7)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
small-scale-sand-filter¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/small-scale-sand-filter.md
Type: direct
2023 source: Small-Scale Sand Filters (BMP Manual §9.9, doc: 2023_BMP_9_9)
2026 source: Small-Scale Sand Filters (BMP Manual §9.9, doc: 2026_BMP_9_9)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
subsurface-gravel-wetland¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/subsurface-gravel-wetland.md
Type: misclassified
2023 source: Subsurface Gravel Wetlands (Non-GI per Manual) (BMP Manual §11.5, doc: 2023_BMP_11_5)
2026 source: Subsurface Gravel Wetlands (Non-GI per Manual) (BMP Manual §11.5, doc: 2026_BMP_11_5)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
tree-trench¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/tree-trench.md
Type: derived
2023 source: Small-Scale Bioretention (tree trench is a subtype) (BMP Manual §9.7, doc: 2023_BMP_9_7)
2026 source: Small-Scale Bioretention (tree trench is a subtype) (BMP Manual §9.7, doc: 2026_BMP_9_7)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
vegetated-filter-strip¶
Library page: Green-Guides/bmp-library/ch9-small-scale-gi/vegetated-filter-strip.md
Type: direct
2023 source: Vegetative Filter Strips (BMP Manual §9.10, doc: 2023_BMP_9_10)
2026 source: Vegetative Filter Strips (BMP Manual §9.10, doc: 2026_BMP_9_10)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
ch10-large-bioretention¶
Library page: Green-Guides/bmp-library/ch10-large-scale-gi/index.md
Type: direct
2023 source: Bioretention Systems (BMP Manual §10.1, doc: 2023_BMP_10_1)
2026 source: Large-Scale Bioretention Systems (BMP Manual §10.1, doc: 2026_BMP_10_1)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| Contributing drainage area | No explicit maximum in BMP Manual (small-scale cutoff at 2.… | No explicit maximum in BMP Manual (small-scale cutoff at 2.… | unchanged | 2023:✓ 2026:✓ | E-03 |
constructed-wetland¶
Library page: Green-Guides/bmp-library/ch10-large-scale-gi/constructed-wetland.md
Type: direct
2023 source: Standard Constructed Wetlands (BMP Manual §10.4, doc: 2023_BMP_10_4)
2026 source: Standard Constructed Wetlands (BMP Manual §10.4, doc: 2026_BMP_10_4)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
extended-detention-ch10¶
Library page: Green-Guides/bmp-library/ch10-large-scale-gi/extended-detention.md
Type: misclassified
2023 source: Extended Detention Basins (Non-GI per Manual) (BMP Manual §11.2, doc: 2023_BMP_11_2)
2026 source: Extended Detention Basins (Non-GI per Manual) (BMP Manual §11.2, doc: 2026_BMP_11_2)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
infiltration-trench¶
Library page: Green-Guides/bmp-library/ch10-large-scale-gi/infiltration-trench.md
Type: direct
2023 source: Infiltration Basins (BMP Manual §10.2, doc: 2023_BMP_10_2)
2026 source: Infiltration Basins (BMP Manual §10.2, doc: 2026_BMP_10_2)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
| SHWT separation | 2 ft — measured from static SHWT | 2 ft — measured from static SHWT | unchanged | 2023:✓ 2026:✓ | E-09 |
sand-filter-ch10¶
Library page: Green-Guides/bmp-library/ch10-large-scale-gi/sand-filter.md
Type: direct
2023 source: Sand Filters (Large-Scale GI) (BMP Manual §10.3, doc: 2023_BMP_10_3)
2026 source: Sand Filters (Large-Scale GI) (BMP Manual §10.3, doc: 2026_BMP_10_3)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
wet-pond-ch10¶
Library page: Green-Guides/bmp-library/ch10-large-scale-gi/wet-pond.md
Type: direct
2023 source: Wet Ponds (Large-Scale GI) (BMP Manual §10.5, doc: 2023_BMP_10_5)
2026 source: Wet Ponds (Large-Scale GI) (BMP Manual §10.5, doc: 2026_BMP_10_5)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
blue-roof¶
Library page: Green-Guides/bmp-library/ch11-non-gi/blue-roof.md
Type: direct
2023 source: Blue Roofs (BMP Manual §11.1, doc: 2023_BMP_11_1)
2026 source: Blue Roofs (BMP Manual §11.1, doc: 2026_BMP_11_1)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
dry-detention¶
Library page: Green-Guides/bmp-library/ch11-non-gi/dry-detention.md
Type: derived
2023 source: Extended Detention Basins (dry detention variant) (BMP Manual §11.2, doc: 2023_BMP_11_2)
2026 source: Extended Detention Basins (dry detention variant) (BMP Manual §11.2, doc: 2026_BMP_11_2)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
extended-detention-ch11¶
Library page: Green-Guides/bmp-library/ch11-non-gi/extended-detention.md
Type: direct
2023 source: Extended Detention Basins (Non-GI) (BMP Manual §11.2, doc: 2023_BMP_11_2)
2026 source: Extended Detention Basins (Non-GI) (BMP Manual §11.2, doc: 2026_BMP_11_2)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
hydrodynamic-separator¶
Library page: Green-Guides/bmp-library/ch11-non-gi/hydrodynamic-separator.md
Type: derived
2023 source: Manufactured Treatment Devices (Non-GI MTD subtype) (BMP Manual §11.3, doc: 2023_BMP_11_3)
2026 source: Non-GI Manufactured Treatment Devices (MTD subtype) (BMP Manual §11.3, doc: 2026_BMP_11_3)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
manufactured-treatment-device¶
Library page: Green-Guides/bmp-library/ch11-non-gi/manufactured-treatment-device.md
Type: direct
2023 source: Manufactured Treatment Devices (Non-GI) (BMP Manual §11.3, doc: 2023_BMP_11_3)
2026 source: Non-GI Manufactured Treatment Devices (BMP Manual §11.3, doc: 2026_BMP_11_3)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
membrane-system¶
Library page: Green-Guides/bmp-library/ch11-non-gi/membrane-system.md
Type: derived
2023 source: Sand Filters (possible parent for membrane systems) (BMP Manual §11.4, doc: 2023_BMP_11_4)
2026 source: Sand Filters With Underdrain (possible parent for membrane systems) (BMP Manual §11.4, doc: 2026_BMP_11_4)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
oil-grit-separator¶
Library page: Green-Guides/bmp-library/ch11-non-gi/oil-grit-separator.md
Type: derived
2023 source: Manufactured Treatment Devices (oil/grit separator subtype) (BMP Manual §11.3, doc: 2023_BMP_11_3)
2026 source: Non-GI Manufactured Treatment Devices (oil/grit separator subtype) (BMP Manual §11.3, doc: 2026_BMP_11_3)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|
underground-detention¶
Library page: Green-Guides/bmp-library/ch11-non-gi/underground-detention.md
Type: derived
2023 source: Extended Detention Basins (underground variant) (BMP Manual §11.2, doc: 2023_BMP_11_2)
2026 source: Extended Detention Basins (underground variant) (BMP Manual §11.2, doc: 2026_BMP_11_2)
| Parameter | 2023 Value | 2026 Value | Change | Verified | Conflicts |
|---|---|---|---|---|---|