physics.fluid.hydraulic_diameter

Three distinct suites: educational examples on the calculator page, this legacy regression count (15/15 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.0.0. CVP 1.0.0-proposed. 4/4 golden · 7/7 CVP boundary · 7/7 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 5/5 CVP contract. digest edc8371a99ac. O2: hydraulic diameter vs a separate-module identity (≤2 ULP). Not Q=Av, not Manning, and not Darcy. ≤2 ULP vs O3 applies only to the published tabulated hydraulic-diameter vectors. Not Q=Av, not Manning, and not Darcy.

• Golden (oracle-backed) 4 / 4
• CVP boundary 7 / 7
• Invalid input 7 / 7
• Property 1 / 1
• Metamorphic 1 / 1
• O3 high-precision 8 / 8
• Cross-interface 2 / 2
• CVP contract 5 / 5
• Interfaces PASS · UI (SSR) / REST / MCP
• Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
• Verified scope D_h = 4A/P_w for a general section, full circular pipe, closed rectangular duct, or annulus, plus R = D_h/4, + O3 mpmath tabulated diameter.
• Assurance Engineering
• Deferred Not Q=Av, not Manning, and not Darcy.

• release artifacts aligned PASS
• schema output required declared PASS
• schema valid input executes PASS
• engine success output validates schema PASS
• rest success payload validates schema PASS

Fingerprint sha256:7c0b6abb3feaef1d4ca77ef75fa3894e04cac58583096ad5793abb903ee8d253

Input schema sha256:0f4da45d859137348ae4dff97662c30d93b356e4bdd6d15d787a1c905890b09c · Output schema sha256:b9a5981e47461877ddac5c3cefe15429a50a835dbd1129ba4016a511616ede31 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

hydraulic-diameter

Engine

hydraulic-diameter

Engine build

2026-09-17

Evidence core

2026-09-17T04:08:59.124Z

Rendered

2026-11-10T05:18:41.928Z

Last reviewed

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Assumptions

• D_h = 4 A / P_w; R = A / P_w = D_h / 4
• Full circular pipe: D_h = D; closed rectangular duct: D_h = 2ab/(a+b); annulus: D_h = D_o − D_i
• Not Q=Av, not Manning Q, not Reynolds, not Darcy, not a weir or orifice

Limitations

• D_h = 4 A / P_w; R = A / P_w = D_h / 4
• Full circular pipe: D_h = D; closed rectangular duct: D_h = 2ab/(a+b); annulus: D_h = D_o − D_i
• Not Q=Av, not Manning Q, not Reynolds, not Darcy, not a weir or orifice