Hydraulic Conductivity / Darcy Flux

Inspectable records

Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Area

Earth & Space (astronomy, orbital mechanics, meteorology, geology, geodesy, oceanography)

Tranche

tranche-5

Evidence ID

t5-070

Ledger rows

1

No ledger note is attached.

Review findings

The algebraic formulas are standard: q = -K·(dh/dl) and Q = q·A. Review is required because the input named only 'hydraulic gradient' without specifying signed versus magnitude semantics, coordinate direction, or output sign convention. The stated honest label should also explicitly distinguish Darcy flux from pore-water velocity. If the promised typical-K reference table is part of the product, its material categories, units, ranges, and provenance must be specified; it is not needed when K is entered directly.

Formula and scope findings

No additional record

Unit assumptions

• K must use a length/time unit system consistent with the desired q and Q units, such as m/s or m/day.
• The hydraulic gradient is dimensionless and must be interpreted as the signed derivative dh/dl along the chosen coordinate direction.
• A is the cross-sectional area perpendicular to flow, in units such as m².
• q has units of length/time, and Q has units of volume/time.
• The minus sign means flow is toward decreasing hydraulic head when the coordinate direction and dh/dl sign are defined conventionally.

Boundary hardening

BREAK_CLAIMED · SELF_FLAGGED

Extreme finite inputs overflow the plain JavaScript arithmetic: multiplying 1e308 by 1e308 yields Infinity, so q and Q become -Infinity. The instrument should reject or flag this rather than present it as a finite physical result.

Errata and corrections

No applied erratum is attached to this unique-name record.

Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

{
  "inputs": {
    "K": 0.0001,
    "K_units": "m/s",
    "hydraulic_gradient": -0.02,
    "gradient_units": "dimensionless signed dh/dl",
    "area": 50,
    "area_units": "m^2"
  },
  "expected_outputs": {
    "q": 0.000002,
    "q_units": "m/s",
    "Q": 0.0001,
    "Q_units": "m^3/s"
  },
  "working": "q = -K·(dh/dl) = -(0.0001 m/s)·(-0.02) = 0.000002 m/s. Q = q·A = (0.000002 m/s)·(50 m^2) = 0.0001 m^3/s."
}

Related workflows

No source-defined multi-instrument workflow membership is recorded.

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json · VERIFIED_CLEAN
• evidence-tranche5/tranche5-results.json
• BOUNDARY_HAZARD_CATALOG.json