OpenHydro Bench: what's new

OpenHydro Bench: what's new https://scott-jeffers.github.io/benchmark1d2d/feed.xml 2026-10-18T04:30:26Z OpenHydro Bench 5 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-18T04:05:00Z 2026-10-18T04:05:00Z

• A12-010_manhole_surcharge_onto_street · OpenSWMM Engine v6 1D/2D (four triangles per grid square) 6.0.0a4.dev1: updated (street_depth) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

6 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-18T04:00:00Z 2026-10-18T04:00:00Z

• A2A-010_macdonald_2d · ANUGA 4.0.1: updated (depth_L1, mass) • A12-010_manhole_surcharge_onto_street · OpenSWMM Engine v6 1D/2D (four triangles per grid square) 6.0.0a4.dev1: updated (street_depth) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

32 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-18T03:58:00Z 2026-10-18T03:58:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A1F-010_ritter_dry_bed_dambreak · HEC-RAS 6.6 2D SWE-ELM: run time recorded (23.8 s) • A1F-011_stoker_wet_bed_dambreak · HEC-RAS 6.6 2D SWE-ELM: run time recorded (23.5 s) • A1F-010_ritter_dry_bed_dambreak · HEC-RAS 6.6 2D SWE-EM: run time recorded (24.6 s) • A1F-011_stoker_wet_bed_dambreak · HEC-RAS 6.6 2D SWE-EM: run time recorded (23.1 s) • A1F-010_ritter_dry_bed_dambreak · HEC-RAS 7.0.1 2D SWE-ELM: run time recorded (19.5 s) • A1F-011_stoker_wet_bed_dambreak · HEC-RAS 7.0.1 2D SWE-ELM: run time recorded (19.6 s) • A1F-010_ritter_dry_bed_dambreak · HEC-RAS 7.0.1 2D SWE-EM: run time recorded (19.5 s) • A1F-011_stoker_wet_bed_dambreak · HEC-RAS 7.0.1 2D SWE-EM: run time recorded (19.3 s) • A2A-010_macdonald_2d · HEC-RAS 6.6 2D SWE-ELM: run time recorded (25.4 s) • A2C-EA1_disconnected_water_body · HEC-RAS 6.6 2D SWE-ELM: run time recorded (37.7 s) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA4_flood_propagation_speed · HEC-RAS 6.6 2D SWE-ELM: run time recorded (629 s) • A2C-EA5_valley_flooding · HEC-RAS 6.6 2D SWE-ELM: run time recorded (136 s) • A2A-010_macdonald_2d · HEC-RAS 6.6 2D SWE-EM: run time recorded (24.5 s) • A2C-EA1_disconnected_water_body · HEC-RAS 6.6 2D SWE-EM: run time recorded (26 s) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2C-EA4_flood_propagation_speed · HEC-RAS 6.6 2D SWE-EM: run time recorded (599 s) • A2C-EA5_valley_flooding · HEC-RAS 6.6 2D SWE-EM: run time recorded (108 s)

4 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T22:15:00Z 2026-10-17T22:15:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

4 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T21:51:00Z 2026-10-17T21:51:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

4 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T21:47:00Z 2026-10-17T21:47:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

4 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T21:24:00Z 2026-10-17T21:24:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

17 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T20:16:00Z 2026-10-17T20:16:00Z

• A1F-010_ritter_dry_bed_dambreak · HEC-RAS 7.0.1 2D SWE-ELM: new: FAIL • A1F-011_stoker_wet_bed_dambreak · HEC-RAS 7.0.1 2D SWE-ELM: new: PASS • A1F-010_ritter_dry_bed_dambreak · HEC-RAS 7.0.1 2D SWE-EM: new: FAIL • A1F-011_stoker_wet_bed_dambreak · HEC-RAS 7.0.1 2D SWE-EM: new: PASS • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation) • A2A-010_macdonald_2d · HEC-RAS 7.0.1 2D SWE-ELM: new: PASS • A2C-EA1_disconnected_water_body · HEC-RAS 7.0.1 2D SWE-ELM: new: PASS • A2C-EA2_floodplain_depressions · HEC-RAS 7.0.1 2D SWE-ELM: new: FAIL • A2C-EA4_flood_propagation_speed · HEC-RAS 7.0.1 2D SWE-ELM: new: PASS • A2C-EA5_valley_flooding · HEC-RAS 7.0.1 2D SWE-ELM: new: PASS • A2A-010_macdonald_2d · HEC-RAS 7.0.1 2D SWE-EM: new: PASS • A2C-EA1_disconnected_water_body · HEC-RAS 7.0.1 2D SWE-EM: new: PASS • A2C-EA2_floodplain_depressions · HEC-RAS 7.0.1 2D SWE-EM: new: FAIL • A2C-EA4_flood_propagation_speed · HEC-RAS 7.0.1 2D SWE-EM: new: PASS • A2C-EA5_valley_flooding · HEC-RAS 7.0.1 2D SWE-EM: new: PASS • A1F-001_macdonald_m1_backwater · HEC-RAS 7.0.1: new: PASS

3 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T12:24:00Z 2026-10-17T12:24:00Z

• A12-010_manhole_surcharge_onto_street · HEC-RAS 7.0.1 pipe networks 1D/2D: updated (water_balance) • A12-011_flood_draining_into_pipe · HEC-RAS 7.0.1 pipe networks 1D/2D: updated (final_level, discharged_volume, water_balance) • A12-012_surcharge_and_return · HEC-RAS 7.0.1 pipe networks 1D/2D: updated (discharged_volume, surface_empty, water_balance)

3 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T12:16:00Z 2026-10-17T12:16:00Z

• A12-010_manhole_surcharge_onto_street · HEC-RAS 7.0.1 pipe networks 1D/2D: new: FAIL • A12-011_flood_draining_into_pipe · HEC-RAS 7.0.1 pipe networks 1D/2D: new: FAIL • A12-012_surcharge_and_return · HEC-RAS 7.0.1 pipe networks 1D/2D: new: FAIL

7 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T11:11:00Z 2026-10-17T11:11:00Z

• parity table nightly_hydra.parquet updated • parity table nightly_hydra.summary.json updated • parity table nightly_openswmm-6-fv.parquet updated • parity table nightly_openswmm-6-fv.summary.json updated • parity table nightly_openswmm-6.parquet updated • parity table nightly_swmm-5.1.15.parquet updated • parity table nightly_swmm-5.1.15.summary.json updated

160 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T10:19:00Z 2026-10-17T10:19:00Z

• A1F-001_macdonald_m1_backwater · ANUGA 4.0.1: run time recorded (10.5 s) • A1F-010_ritter_dry_bed_dambreak · ANUGA 4.0.1: run time recorded (6.22 s) • A1F-011_stoker_wet_bed_dambreak · ANUGA 4.0.1: run time recorded (3.34 s) • A1F-020_hydraulic_jump_belanger · ANUGA 4.0.1: run time recorded (27.6 s) • A2A-001_thacker_parabolic_bowl · ANUGA 4.0.1: run time recorded (21.2 s) • A2A-010_macdonald_2d · ANUGA 4.0.1: run time recorded (42 s) • A2A-020_oblique_hydraulic_jump · ANUGA 4.0.1: run time recorded (329 s) • A2C-EA1_disconnected_water_body · ANUGA 4.0.1: run time recorded (99 s) • A2C-EA4_flood_propagation_speed · ANUGA 4.0.1 at 10 m (spec alternative resolution): run time recorded (582 s) • A1F-001_macdonald_m1_backwater · Basilisk Saint-Venant (snapshot de851a91): run time recorded (0.115 s) • A1F-010_ritter_dry_bed_dambreak · Basilisk Saint-Venant (snapshot de851a91): run time recorded (0.065 s) • A1F-011_stoker_wet_bed_dambreak · Basilisk Saint-Venant (snapshot de851a91): run time recorded (0.028 s) • A1F-020_hydraulic_jump_belanger · Basilisk Saint-Venant (snapshot de851a91): run time recorded (0.29 s) • A1F-040_swashes_bump_subcritical · Basilisk Saint-Venant (snapshot de851a91): run time recorded (3.6 s) • A1F-041_swashes_bump_transcritical · Basilisk Saint-Venant (snapshot de851a91): run time recorded (3.06 s) • A1F-042_swashes_bump_shock · Basilisk Saint-Venant (snapshot de851a91): run time recorded (1.72 s) • A1F-043_swashes_lake_at_rest_emerged_bump · Basilisk Saint-Venant (snapshot de851a91): run time recorded (0.17 s) • A2A-001_thacker_parabolic_bowl · Basilisk Saint-Venant (snapshot de851a91): run time recorded (0.959 s) • A2A-010_macdonald_2d · Basilisk Saint-Venant (snapshot de851a91): run time recorded (2.51 s) • A2A-020_oblique_hydraulic_jump · Basilisk Saint-Venant (snapshot de851a91): run time recorded (14.9 s)

1 result change https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T09:05:00Z 2026-10-17T09:05:00Z

• A12-010_manhole_surcharge_onto_street · OpenSWMM Engine v6 1D/2D (four triangles per grid square) 6.0.0a4.dev1: updated (street_depth)

2 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-17T08:42:00Z 2026-10-17T08:42:00Z

• A1F-010_ritter_dry_bed_dambreak · HydroNet FVM-PINN (0d98ff5): updated (volume_front, mass) • A1F-011_stoker_wet_bed_dambreak · HydroNet FVM-PINN (0d98ff5): updated (L1_h, mass)

1 result change https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T17:47:00Z 2026-10-16T17:47:00Z

• A12-010_manhole_surcharge_onto_street · OpenSWMM Engine v6 1D/2D (four triangles per grid square) 6.0.0a4.dev1: updated (street_depth)

1 result change https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T17:31:00Z 2026-10-16T17:31:00Z

• A2A-010_macdonald_2d · ANUGA 4.0.1: updated (depth_L1, mass)

3 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T17:22:00Z 2026-10-16T17:22:00Z

• A1F-020_hydraulic_jump_belanger · Hydra urban drainage (17.0.0/4.1.1): new: FAIL • A1F-020_hydraulic_jump_belanger · OpenSWMM Engine v6 dynamic wave (6.0.0a4.dev1): new: FAIL • A1F-020_hydraulic_jump_belanger · OpenSWMM Engine v6 finite volume (6.0.0a4.dev1): new: FAIL

3 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T17:11:00Z 2026-10-16T17:11:00Z

• parity table bellinge_hydra.parquet updated • parity table bellinge_openswmm-6.parquet updated • parity table bellinge_openswmm-6-fv.parquet updated

1 result change https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T16:54:00Z 2026-10-16T16:54:00Z

• A2A-010_macdonald_2d · ANUGA 4.0.1: updated (depth_L1, mass)

2 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T16:45:00Z 2026-10-16T16:45:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

4 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T16:44:00Z 2026-10-16T16:44:00Z

3 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T15:41:00Z 2026-10-16T15:41:00Z

• parity table bellinge_hydra.parquet updated • parity table bellinge_openswmm-6.parquet updated • parity table bellinge_openswmm-6-fv.parquet updated

2 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T14:53:00Z 2026-10-16T14:53:00Z

1 result change https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T13:48:00Z 2026-10-16T13:48:00Z

• A12-010_manhole_surcharge_onto_street · OpenSWMM Engine v6 1D/2D (four triangles per grid square) 6.0.0a4.dev1: updated (street_depth)

2 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T13:44:00Z 2026-10-16T13:44:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

2 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T13:21:00Z 2026-10-16T13:21:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

2 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T12:58:00Z 2026-10-16T12:58:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

6 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T12:30:00Z 2026-10-16T12:30:00Z

• parity table bellinge_hydra.parquet updated • parity table bellinge_hydra.summary.json updated • parity table bellinge_openswmm-6.parquet updated • parity table bellinge_openswmm-6.summary.json updated • parity table bellinge_openswmm-6-fv.parquet updated • parity table bellinge_openswmm-6-fv.summary.json updated

1 result change https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T11:34:00Z 2026-10-16T11:34:00Z

• A12-010_manhole_surcharge_onto_street · OpenSWMM Engine v6 1D/2D (four triangles per grid square) 6.0.0a4.dev1: updated (street_depth)

2 result changes https://scott-jeffers.github.io/benchmark1d2d/news.html#2026-10-16T11:30:00Z 2026-10-16T11:30:00Z

• A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-ELM: updated (mass_conservation) • A2C-EA2_floodplain_depressions · HEC-RAS 6.6 2D SWE-EM: updated (mass_conservation)

Release 0.5.0 https://scott-jeffers.github.io/benchmark1d2d/news.html#v0.5.0#2026-10-15T12:00:00Z 2026-10-15T12:00:00Z

Exact answers for drainage networks and 1D/2D coupling, the SWASHES cases, a route for results from codes the suite cannot run, and an outside-review packet. • SWASHES cases (A1F-040 to 043) • Submitting results • A page per model • SWMM parity over time • Outside-review packet • CI results reach the site automatically • TELEMAC-2D runs were capped at a 0.001–0.01 s step • EA tests: the largest step is 1 s for every code • Exact coupled 1D/2D tests (A12-010 to 012) • Exact-answer drainage-network tests (A1D-001 to 005) • More production codes on the 2D cases • HydroNet (Penn State) scored • Hydra (NEER AI) scored on both its engines • A1F-010 v2.0.0: the gating front check is now integral • The website is rebuilt as OpenHydro Bench • HEC-RAS 6.6 scored • HEC-RAS 6.6 2D scored on the dam breaks, fully headless • openTELEMAC-2D 9.1.1 scored • ANUGA 4.0.1, GeoClaw 5.9.2 and LISFLOOD-FP 8.3 scored • OpenSWMM Engine v6 (HydroCouple's SWMM 6) scored • SWMM on the 1D channel physics cases • LISFLOOD-FP 8.3 on the EA inter-comparison tests • Corpus parity no longer builds a results table per model • TELEMAC-2D on the Thacker bowl (A2A-001): passes

Release 0.4.0 https://scott-jeffers.github.io/benchmark1d2d/news.html#v0.4.0#2026-10-14T12:00:00Z 2026-10-14T12:00:00Z

A second review. Every scored Track A case now has a run that passes it, and the corpus can score any SWMM engine against 5.2.4. • MacDonald 2D reference was not a shallow-water solution • Oblique-jump reference • Joukowsky "continuity" • Pipe and transport cases were unmeetable templates • PR corpus tier covered one collection • Site

Release 0.3.0 https://scott-jeffers.github.io/benchmark1d2d/news.html#v0.3.0#2026-10-13T12:00:00Z 2026-10-13T12:00:00Z

An end-to-end audit found defects that affected published results. All are fixed, covered by regression tests, and listed on the site's Reports page. • Track B parity compared results with themselves • Error norms inflated observed orders by +1 • Fake 1D solvers • Thacker reference violated mass conservation • Joukowsky convergence target • Probe lookup • Certification claims

Release 0.2.1 https://scott-jeffers.github.io/benchmark1d2d/news.html#v0.2.1#2026-10-13T12:00:00Z 2026-10-13T12:00:00Z

Release 0.2.0 https://scott-jeffers.github.io/benchmark1d2d/news.html#v0.2.0#2026-10-13T12:00:00Z 2026-10-13T12:00:00Z

Release 0.1.0 https://scott-jeffers.github.io/benchmark1d2d/news.html#v0.1.0#2026-10-13T12:00:00Z 2026-10-13T12:00:00Z