hydro-context
Skill67 starsChanged 6 months agoMITView on GitHub
Apply US hydrology domain knowledge — units, formulas, and conventions — when reading or writing hydrological code
In this repository3 other files it gives its agents.
- CLAUDE.mdCLAUDE.md
- flow-reportSkill
- run-testsSkill
The file
We split this skill into the rules it gives an agent
1 rule. About 0 are common, 1 is distinctive, and 0 are very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈1
Distinctive · estimate
This author's own choices. Worth a look.
0
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Distinctive: line 11
Always check that input/output units are consistent.
≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
You are assisting with US hydrology / water resources engineering code. Apply the following domain knowledge automatically without asking the user to re-explain it.
Units
- Discharge (streamflow): cubic feet per second (cfs) in US datasets; m³/s (cms) internationally
- Stage (water level): feet in USGS data; metres in international datasets
- Always check that input/output units are consistent; flag mismatches as a comment or warning
Key formulas
Rating curve (stage-discharge): Q = a × (H – H₀)^b
- H = stage, H₀ = zero-flow stage offset, a and b are fitted constants
- Typical b range: 1.5–3.0 for natural channels; fit in log-log space
Manning's equation (open-channel flow): Q = (1/n) × A × R^(2/3) × S^(1/2)
- n = Manning's roughness (0.025–0.05 for natural channels)
- R = hydraulic radius, S = channel slope (dimensionless, m/m or ft/ft)
Log-Pearson Type III is the standard US flood frequency distribution (USGS Bulletin 17C).
- Work in log₁₀ space: fit the mean, standard deviation, and skewness of log₁₀(Q)
Weibull plotting position: P(X ≤ x) = m / (n + 1), return period T = (n + 1) / m
- m = rank (1 = smallest), n = total number of data points
Flood frequency terminology
- Return period (recurrence interval): average years between events of that magnitude or greater
- Q2: 2-year flood (50% annual exceedance probability) ≈ bankfull flow in many streams
- Q10: 10-year flood (10% AEP)
- Q100: 100-year flood (1% AEP) — US regulatory floodplain standard
- AEP: Annual Exceedance Probability = 1 / T
Data quality conventions
- USGS missing-data sentinel: -999999 — always filter these before any calculation
- Negative discharge values are physically impossible — treat as errors
- Water year: Oct 1 – Sep 30 (US convention); water year N starts Oct 1 of year N-1
- Minimum record length for reliable flood frequency: ≥ 10 years (30+ preferred for Q100)
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