# 📐 L2 Spec — Boussinesq Approximation — buoyant flow Mismatch-Only Spec
**ID:** `L2-182-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-182`](/artifact/l1/L1-182)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41553970
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 – 2048 |
| W | px | 32 – 2048 |
| Z | — | 16 – 1024 |
| Ra | — | 1000.0 – 1000000000000.0 |
| Snr db | dB | 0 – 40 |
| N times | — | 50 – 100000 |
| Pr error | — | 0.0 – 0.1 |
| Bc error | — | 0.0 – 0.3 |
| Beta error | — | 0.0 – 0.1 |
## 2. Tolerance (ε)
**Type:** `fn`
```
15.0 + 0.3*SNR_dB - 30.0*beta_error - 20.0*Pr_error - 10.0*bc_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`eab628906866189b71d778b4c94fb87d8454e3a2916afcba354139170f43571e`
## 5. On-chain Registration
- **Chain hash:** `0x3d1b741442904c66f0164737c142e2e3b586d124a59795d55c1837f2a85c00c2`
- **Chain tx hash:** `0x1d938890a7e3b99476625c8ad33bdfd7fcbe59e784b2e97ef10bc811c4ce40d2`
- **Chain block:** `41553970`
---
## File Mapping
This bundle consists of: `L2-182-001.md`, `L2-182-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-182-001.md` | Source of truth — edit this | Human or LLM |
| `L2-182-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-182-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._