Source: https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/implementation/

instrument implementation / implementation-contract

# Water Intake / Hydration Estimator implementation

A source-bound implementation contract for Water Intake / Hydration Estimator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-046

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not define activity adjustments, climate effects, or a branch rule, and it permits arithmetic inputs that can yield nonphysical zero values or JavaScript Infinity at extreme magnitudes. Unit ambiguity can also change the result substantially.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "weight_kg": 50,
    "activity_adjustment_ml": 0,
    "climate": "temperate"
  },
  "expected_outputs": {
    "suggested_daily_intake_L": 1.75
  },
  "working": "Base intake = 35 mL/kg/day × 50 kg = 1750 mL/day. Activity adjustment = 0 mL/day. Total = 1750 + 0 = 1750 mL/day. Convert to liters: 1750 ÷ 1000 = 1.75 L/day."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/water-intake-hydration-estimator/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`