CVP verified calculation capability

Hydraulic jump Calculation Capability

Rectangular sequent depths y2/y1=(√(1+8Fr₁²)−1)/2. Fr₁>1. Not a Froude wrap, not Manning, not a weir, not Q=Av.

Physics · Fluid Capability ID physics.fluid.hydraulic_jump version 1.0.0 CVP VERIFIED CURRENT Engineering

Model

Sequent depth

Sequent depth: y₂/y₁ = (√(1+8 Fr₁²) − 1)/2
Energy loss: ΔE = (y₂ − y₁)³ / (4 y₁ y₂)
Downstream Froude: Fr₂ = Fr₁ / (y₂/y₁)^{3/2}

Modes: sequent · upstream · energy

Inputs / Outputs

Canonical symbols for this capability. Agent schemas remain the contract.

Symbol	Quantity	Unit	Role
`y1`	Upstream depth in m	—	input / output
`y2`	Downstream sequent depth in m	—	input / output
`Fr`	Upstream Froude number Fr₁ > 1	—	input
`v`	Upstream speed in m/s	—	input
`v`	Upstream speed in m/s	m/s	input
`g`	Gravity in m/s²	—	input / output
`Fr1`	—	—	output
`Fr2`	—	—	output
`v1`	—	—	output
`v2`	—	—	output
`dE`	—	—	output
`model`	—	—	output

Assumptions / Validity

Declared scope for this capability. Do not use it outside this domain.

Assumptions

Rectangular hydraulic jump: y2/y1 = (√(1+8 Fr₁²) − 1)/2; Fr₁ > 1
ΔE = (y2 − y1)³ / (4 y1 y2); Fr₂ = Fr₁ / (y2/y1)^{3/2}
Not a Froude wrap, not Manning, not Chezy, not a weir, not Q=Av

Not supported

Froude-only Fr=v/√(gL)
Manning n
Chezy C
weir Q(H)
Q=Av
trapezoid z (that is /calc/physics/trapezoidal-hydraulic-jump)

Example

One numerical check. The calculator page holds worked steps and FAQ.

y1=1 Fr=2 → y2=(√33−1)/2

Open this example in the calculator

Trust

CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance · Rectangular sequent depth y2/y1 = ½(−1+√(1+8 Fr₁²)) with upstream and energy solves; + O3 mpmath tabulated depths.. Computational verification is defined by CVP. Supplemental domain review (internal) and named expert review are defined by the Review policy and do not by themselves determine CVP conformance.

CVP: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance · Rectangular sequent depth y2/y1 = ½(−1+√(1+8 Fr₁²)) with upstream and energy solves; + O3 mpmath tabulated depths.· View Manifest · CVP overview · Specification
Verified scope: Rectangular sequent depth y2/y1 = ½(−1+√(1+8 Fr₁²)) with upstream and energy solves; + O3 mpmath tabulated depths.
Assurance: Engineering
Declared partition coverage: PASS · 5/5 declared partitions (sequent, solve, alias, awkward, invalid-domain)
Deferred: Not trapezoidal jump, not Manning, not specific-energy alternate depth alone, and not Q=Av.
Calculation version: 1.0.0
Verification: 17/17 calculation tests · 2/2 legacy golden · 10/10 legacy boundary · 5/5 legacy property
Production surface contract: 5/5
Versions: Calculation 1.0.0 · CVP protocol 1.0.0-proposed · Evidence 2026-09-26.o2-o3
Verification revision: 2026-09-26.o2-o3 · 1/1 property · digest 929f014e301e
Reference: O1 model · O3 expected_values · O3 numerical_behavior · O2 expected_values · O2 numerical_behavior
Numerical scope: O2: sequent depth y2/y1 = ½(−1+√(1+8 Fr₁²)) vs a separate-module identity (≤2 ULP). Not trapezoid jump, not specific energy alone, and not Q=Av. ≤2 ULP vs O3 applies only to the published tabulated hydraulic-jump vectors. Not trapezoid jump, not Manning, and not Q=Av.
Interfaces: PASS · UI (SSR) / REST / MCP
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.
CVP suite: 4/4 golden · 10/10 CVP boundary · 10/10 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 5/5 CVP contract
Supplemental domain review: Not performed
Named expert review: Not performed
Version lock: Supported (409 VERSION_MISMATCH)
Artifact consistency: Build verified · 1.0.0 (workspace artifacts agree)
Review-policy tier: Engine tested — catalog token engine_tested; supplemental; not CVP status

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

Call this capability

Human page, REST, and MCP share the same engine and calculation_version. Build verified hashes workspace artifacts only. After deploy, attest:production GETs canonical URLs twice — the public/cached view an Agent actually hits, and origin — including every /capabilities/{id} HTML page. Public Capability HTML version must match catalog before production attestation passes. Live Trust rows above fetch /.well-known/calculatorx-production-attestation.json and the output schema const. Build hashes: release integrity. That proves currently published page / engine / schema / evidence / MCP agree — not that a historical version is independently immutable. Reference Calculation Standard — Production surface contract 5/5.

curl -sS -X POST 'https://www.calculatorx.com/api/v1/calc/hydraulic-jump' \
  -H 'Content-Type: application/json' \
  -d '{"inputs":{"y1":1,"Fr":2},"calculation_version":"1.0.0"}'

{
  "inputs": {
    "y1": 1,
    "Fr": 2
  },
  "calculation_version": "1.0.0"
}

POST /api/v1/calc/hydraulic-jump. This is a POST calculate endpoint — do not GET it.

Full REST contract: REST API docs.

Tool id: hydraulic-jump
Engine: hydraulic-jump
REST: POST /api/v1/calc/hydraulic-jump
MCP: execute_calculation with capability_id: "physics.fluid.hydraulic_jump"
Agent input schema: Canonical (MCP / Agent)
Output schema: JSON Schema (latest)
Versioned input schema: Immutable pin (1.0.0)
Versioned output schema: Immutable pin (1.0.0)

References

Human-readable sources plus CVP reference evidence classes.

Sources

ISO 80000-11 — Characteristic numbers — Froude number Fr
Chow, V.T. Open-Channel Hydraulics — Hydraulic jump

Reference evidence classes: O1 model · O3 expected_values · O3 numerical_behavior · O2 expected_values · O2 numerical_behavior

Try with an agent

Inspect, then execute. Same engine as REST and the human calculator.

curl -sS -X POST 'https://www.calculatorx.com/mcp' \
  -H 'Content-Type: application/json' \
  -H 'MCP-Protocol-Version: 2026-07-28' \
  -H 'Mcp-Method: tools/call' \
  -H 'Mcp-Name: inspect_capability' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"inspect_capability","arguments":{"capability_id":"physics.fluid.hydraulic_jump"},"_meta":{"io.modelcontextprotocol/protocolVersion":"2026-07-28","io.modelcontextprotocol/clientInfo":{"name":"calculatorx-docs-example","version":"1.0.0"},"io.modelcontextprotocol/clientCapabilities":{}}}}'

curl -sS -X POST 'https://www.calculatorx.com/mcp' \
  -H 'Content-Type: application/json' \
  -H 'MCP-Protocol-Version: 2026-07-28' \
  -H 'Mcp-Method: tools/call' \
  -H 'Mcp-Name: execute_calculation' \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"execute_calculation","arguments":{"capability_id":"physics.fluid.hydraulic_jump","inputs":{"y1":1,"Fr":2},"calculation_version":"1.0.0"},"_meta":{"io.modelcontextprotocol/protocolVersion":"2026-07-28","io.modelcontextprotocol/clientInfo":{"name":"calculatorx-docs-example","version":"1.0.0"},"io.modelcontextprotocol/clientCapabilities":{}}}}'

Pin calculation_version (1.0.0) when the result must stay reproducible.

Inspect the trust tier and required assurance level before execution. Full protocol notes: MCP docs.