Public evidence

physics.fluid.manning

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

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Verification

13/13 calculation tests · Production surface contract 3/3

Golden tests 1 / 1
Boundary tests 7 / 7
Property tests 5 / 5
Production surface contract 3 / 3
Engine tested Yes
Source checked Yes
Artifact integrity PASS
Production attestation Embedded snapshot: STALE · Last attested schema matched 1.0.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status PASS (0 stale; 163 CURRENT) @ 2026-09-17T03:09:03.307Z
Semantic contract PASS
Evidence attested at 2026-09-17T03:09:02.494Z
Last production check 2026-09-17T03:09:02.494Z
Public / cache PASS
Origin PASS
Supplemental domain review Not performed
Named expert review Not performed

release artifacts aligned PASS
schema valid input executes PASS
engine success output 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.

Build & scope

Engine identity and declared limitations.

Tool: manning-formula
Engine: manning-formula
Engine build: 2026-09-17
Evidence core: 2026-09-17T01:17:06.750Z
Rendered: 2026-09-17T02:45:35.817Z
Last reviewed: —

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

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

ISO 80000-4 — Mechanics — Volume flow rate and hydraulic radius
Supports: Q is volume flow; hydraulic radius R = A/P
Chow, V.T. Open-Channel Hydraulics — Manning formula
Supports: SI form Q = (1/n) A R^{2/3} S^{1/2} for uniform flow

Published checks

Golden, boundary, and property cases included in this evidence build.

ID	Kind	Status	Detail
`golden-manning`	golden	pass	Expected n=0.013 · Q=1.532392380637864 · v=1.532392380637864 · A=1 · R=0.5 · S=0.001 · k=1 · model=manning · Actual n=0.013 · mode=discharge · Q=1.532392380637864 · v=1.532392380637864 · A=1 · R=0.5 · S=0.001 · k=1
`boundary-manning-p`	boundary	pass	Expected R=0.5 · model=manning · Actual n=0.013 · mode=discharge · Q=1.532392380637864 · v=1.532392380637864 · A=1 · R=0.5 · S=0.001 · k=1
`boundary-manning-n`	boundary	pass	Expected n=0.013 · model=manning · Actual n=0.013000000000000003 · mode=n · Q=1.532392380637864 · v=1.532392380637864 · A=1 · R=0.5 · S=0.001 · k=1
`boundary-manning-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-manning-n0`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`boundary-manning-mixed`	boundary	pass	Expected MIXED_INPUT_ENCODING · Actual MIXED_INPUT_ENCODING
`boundary-manning-k`	boundary	pass	Expected INVALID_MODE · Actual INVALID_MODE
`boundary-manning-weir`	boundary	pass	Expected INVALID_MODE · Actual INVALID_MODE
`property-manning-v`	property	pass	V=(1/n)R^{2/3}S^{1/2}
`property-manning-q`	property	pass	Q=AV from Manning V
`property-manning-r`	property	pass	R=A/P
`property-manning-n`	property	pass	n round-trip
`property-manning-model`	property	pass	manning SI k=1