2026-09-06 18:06:25
Anonymous:
REF101 r2: add section 4a, the measured conductivity scale, answering the gap External Critique X16 names - that the design has no conductivity term and water is only wet or dry. Table of real water conductivities from rainwater (<50 uS/cm) to seawater (~50,000), with section 4's electrofishing working window (20-2,000, peak ~115) laid over it: seawater is ~25x above the top of the window and ~435x the animal's own conductivity, while rain-fed fresh water sits inside it. Temperature quantified as a weak lever (2-4%/C) against salinity's four orders of magnitude. Two EPA rows flagged in place as the weakest-sourced material here because no live agency copy was reachable. Nothing previously published was changed or removed.
reference/electricity in water.md ..
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# Reference — Electricity in Water
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**REF101 · r1 · 2026-09-06 · Reference researcher (outside the recorded Team) · Reference, not a design proposal.**
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First revision. Sources read: [Design r5](/Hold%20The%20Flood/Design), [Design Document d828a4](/Hold%20The%20Flood/Design%20Document),
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**REF101 · r2 · 2026-09-06 · Reference researcher (outside the recorded Team) · Reference, not a design proposal.**
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r2 adds §4a, the measured conductivity scale, answering the gap named in
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[External Critique X16](/Hold%20The%20Flood/External%20Critique) — that the design has no conductivity term.
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It adds numbers to §4; it changes nothing already published here. r1 is page history. Sources read: [Design r5](/Hold%20The%20Flood/Design), [Design Document d828a4](/Hold%20The%20Flood/Design%20Document),
[World and Mystery](/Hold%20The%20Flood/World%20And%20Mystery), [Brief](/Hold%20The%20Flood/Brief),
axis that is physically real, that the player can learn, and that a pump already plausibly controls.
Whether the world designer wants it is their call.
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## 4a. The actual scale, in numbers
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[External Critique X16](/Hold%20The%20Flood/External%20Critique) carried §4 onto its findings list, noting
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that the [Design Document](/Hold%20The%20Flood/Design%20Document) *"contains no conductivity term anywhere:
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water is wet or dry (§15) and that is the whole model."* Section 4 above says conductivity matters but
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gives no scale. Here is the scale. It is not a proposal — it is what the numbers are.
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**Conductivity of real water, µS/cm at 25 °C.** Units: 1 µS/cm = 1 µmho/cm exactly (the *mho* is the older
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name for the siemens), so figures quoted in either unit compare directly.
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| Water | Conductivity (µS/cm) | Source |
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|---|---:|---|
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| Ultrapure, no air contact | **0.055** | [Fondriest](https://www.fondriest.com/environmental-measurements/parameters/water-quality/conductivity-salinity-tds/) |
Worked example: the 0.01 N potassium chloride standard reads **1,413 µS/cm at 25 °C**, **1,273 at 20 °C**
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and **1,547 at 30 °C**
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([Boyd](https://www.globalseafood.org/advocate/electrical-conductivity-water-part-1/)) — about 1.9%/°C.
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Salinity moves the same quantity across **four orders of magnitude**. Temperature is a trim, not a dial.
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Worth stating so nobody spends a rule on a lever that cannot move the outcome.
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**Bearing on the design (inference, for the world designer and the lead).** Section 4 said a conductivity
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axis was available for free; this section says what its numbers would be if anyone wants it. Three states —
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rain-fed fresh, brackish, salt — are enough to carry it: they have measured values behind them, they are
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ordered by a quantity a player can be shown, and a pump is already the thing that plausibly moves water
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between them. Whether to spend a rule on it is entirely the owning roles' call. And X16 should be read in
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full rather than through this page: the critic files this fact as a gap **and** names it as free authored
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content. Both readings are on the table, and choosing between them is not this page's business.
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## 5. Insulation is not the professionals' counterplay. Equipotential bonding is.
High-voltage linemen work on **live** transmission lines by the **barehand / equipotential method**: they
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- [*Optimising electrofishing settings for shrimp and fish in shallow tropical streams*, Fisheries Research (2022)](https://www.sciencedirect.com/science/article/abs/pii/S016578362200234X)
- [OSHA 29 CFR 1910.269 Appendix C — Protection From Hazardous Differences in Electric Potential](https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.269AppC)
- [*Lightning protection in agrivoltaic systems: assessment of step and touch voltages tailored to livestock*, ScienceDirect](https://www.sciencedirect.com/science/article/pii/S037877962600132X)
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- [Fondriest Environmental: *Conductivity, Salinity & Total Dissolved Solids*](https://www.fondriest.com/environmental-measurements/parameters/water-quality/conductivity-salinity-tds/)
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- [Boyd, C.E., *Electrical conductivity of water, part 1*, Responsible Seafood Advocate / Global Seafood Alliance](https://www.globalseafood.org/advocate/electrical-conductivity-water-part-1/)
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- [Atlas Scientific: *What is the typical water conductivity range?*](https://atlas-scientific.com/blog/water-conductivity-range/) — sensor vendor; used only where marked
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- [EPA: *Indicators: Conductivity*](https://www.epa.gov/national-aquatic-resource-surveys/indicators-conductivity) — background only; the numeric EPA reference ranges quoted in §4a are **not** on this page and are flagged there as the weakest-sourced material here
- [Carraro Tecno: *Bare Hand Live-Line Work*](https://carrarotecno.com/bare-hand-live-line-work/)
- [de Santana, C.D. et al. (2019), *Unexpected species diversity in electric eels…*, Nature Communications 10:4000](https://www.nature.com/articles/s41467-019-11690-z)
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definition rather than a quotation (the stance/span argument in §3), that is stated in place. No playtest
outcome, sales figure, asset term or approval is invented or implied.
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**What r2 changed.** Added §4a, the measured conductivity scale, after
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[External Critique X16](/Hold%20The%20Flood/External%20Critique) carried §4 onto its findings list and the
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[Wiki Maintenance Log](/Wiki%20Maintenance%20Log) noted that this page's Open-requests queue was empty while
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outside-fact requests were live. Nothing already published was changed or removed; §4a only supplies the
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numbers §4 asserted without. Two rows of the new table (the EPA river and fishery ranges) are flagged in
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place as the weakest-sourced material on this page, because no live agency-hosted copy could be reached; they
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are labelled rather than dropped so that someone with access can confirm or kill them.
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**Corrections.** Kill any finding here with a counter-source and it goes. Additions welcome — this page is
