physics.fluid.submerged_weir

• Golden tests 0 / 0
• Boundary tests 0 / 0
• Property tests 5 / 5
• Production surface contract 1 / 1
}
• 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; 164 CURRENT) @ 2026-09-18T13:56:15.885Z
• Semantic contract PASS
• Evidence attested at 2026-09-18T13:56:15.080Z
• Last production check 2026-09-18T13:56:15.080Z
• Public / cache PASS
• Origin PASS
• Supplemental domain review Not performed
• Named expert review Not performed

• release artifacts aligned PASS

Fingerprint sha256:3fe97780f2eb5a2d76d375ec125899258ba6d9d6310b40258ea698c8c44e8339

Input schema sha256:1f6b21a32f617329f54a31f47f7b19c3f3f66f6fa8ca9a82acc4395844f34ef4 · Output schema sha256:57d8a0bc73eb02ae72f8bbf3131dadcd56005659de9618fd8d80ad08ce44d0a8 · 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

submerged-weir

Engine

submerged-weir

Engine build

2026-09-18

Evidence core

2026-09-18T13:11:24.388Z

Rendered

2026-09-18T13:24:50.104Z

Last reviewed

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Assumptions

• Rectangular thin-plate; drowned nappe
• SI g=9.80665 unless given
• Villemonte n=1.5 and exponent 0.385; n is not Manning n
• Default C_d=0.62; optional C_d in (0, 1]
• Not free-flow H only, not ogee Hd, not side weir, not Manning, not Q=Av

Limitations

• Villemonte 1947 rectangular submerged weir: Qs = Qf [1−(H2/H1)^{1.5}]^{0.385}; Qf=(2/3) C_d L √(2g) H1^{3/2}; default C_d=0.62; n=1.5 is not Manning n
• Requires H1 and H2; H2/H1∈[0.20, 0.95]; H1>H2>0; C_d optional in (0, 1]; SI; rectangular thin-plate only
• Not free-flow thin-plate H only, not ogee Hd, not side weir B+Q1, not Manning n, not Q=Av, not V-notch