physics.fluid.manning

Three distinct suites: educational examples on the calculator page, this legacy regression count (13/13 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 2026-09-26.o2-o3. Calculation version 1.0.0. CVP 1.0.0-proposed. 4/4 golden · 6/6 CVP boundary · 8/8 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 5/5 CVP contract. digest 59bd904ca406. O2: SI Manning vs a separate-module identity (≤2 ULP). Not Darcy f, not Chezy C, not Hazen–Williams, not Q=Av, and not normal-depth yn. ≤2 ULP vs O3 applies only to the published tabulated Manning vectors. Not Darcy f, not Chezy C, not Hazen–Williams, not Q=Av, and not normal-depth yn.

• Golden (oracle-backed) 4 / 4
• CVP boundary 6 / 6
• Invalid input 8 / 8
• 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 SI Manning Q = (1/n) A R^{2/3} S^{1/2}, plus velocity, n, and S solves, + O3 mpmath tabulated discharge.
• Assurance Engineering
• Deferred Not Darcy f, not Chezy C, not Hazen–Williams, not Q=Av, and not normal-depth yn.

• 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 sha256:93f113a7fd2df34c77ef3cca909a6174552c51fc00e487ead910dbe897194904

Input schema sha256:ce75b3f712d318b9be8b796e369ab70b38e9ae1e2beb31e450bd3d90afb698a4 · Output schema sha256:1fb3e4b2796c9eca80d859ad82e7749283a0367586f02b6a82a2c52f47694d62 · 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

manning-formula

Engine

manning-formula

Engine build

2026-09-17

Evidence core

2026-09-17T01:17:06.750Z

Rendered

2026-11-10T05:18:41.919Z

Last reviewed

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Assumptions

• SI Manning k=1
• Uniform open-channel flow
• R = A/P
• Not Q=Av identities
• Not Darcy–Weisbach
• Not a weir

Limitations

• SI only: k=1. US customary 1.486 is out of scope
• Uniform open-channel flow; R=A/P
• Not Q=Av identities (see /calc/physics/flow-rate)
• Not Darcy–Weisbach pipe head loss
• Not a weir or orifice