Build a Defensible Lake Hydroclimate Baseline, Trend, and Future-Conditions Evidence Package

Record the decision owner, spatial boundary, locations, vertical and horizontal references, baseline and comparison periods, future horizons, seasonal or event windows, required variables, units, temporal aggregation, spatial resolution, completeness, uncertainty, update time, and prohibited uses. Define whether the package supports screening, trend analysis, stress testing, operational awareness, design input, or monitoring.

Sources: [15], [3]

• Observation and provisional or approved status
• Derived observation and complete transformation
• Normal and exact reference period
• Reanalysis and assimilation/model lineage
• Forecast or outlook, issue time, valid time, probability, and update
• Historical statistic and record/method
• Projection, experiment, scenario, model, ensemble, and horizon
• Modeled hydrologic or lake response and calibration/validation scope

Sources: [4], [9], [1]

Retain provider, product, variable, station or cell ID, coordinates, elevation, datum, distance and terrain relation to the lake, instrument or generation method, observation interval, time convention, units, flags, missingness, homogenization, version, retrieval date, and license. Document interpolation, spatial averaging, lapse or elevation adjustment, infilling, resampling, and lake-transfer assumptions.

Sources: [4], [11]

Align precipitation, air temperature, humidity, wind and radiation where available; snow, ice and soil moisture; inflow, groundwater and withdrawals; lake level, storage, outflow and residence time; water temperature, stratification, oxygen, clarity, nutrients and biological indicators; land cover, infrastructure, outlet operations and management changes. Preserve raw, quality-controlled, derived, and modeled fields separately.

Sources: [1], [10], [16]

Record precipitation duration, depth or intensity, annual exceedance probability, confidence bounds, atlas volume/version, station or grid context, and controlling authority. A one-percent AEP event has a one-percent chance of exceedance in each year under the stated analysis; it is not scheduled once per century and can recur. NOAA identifies Atlas 14 as the existing national standard while Atlas 15 remains in development; pilot or preliminary Atlas 15 values are not final standards.

Sources: [6], [7]

Preserve watershed antecedent conditions, snow and ice, soil moisture, drainage, conveyance, storage, outlet and dam operations, backwater, wind setup, groundwater, debris, and infrastructure state. Keep precipitation frequency, peak-flow frequency, observed stage, forecast stage, surveyed high-water marks, modeled inundation, lake elevation, and official floodplain determinations separate. StreamStats outputs require state-specific method review, uncertainty, and basin delineation checks.

Sources: [12], [10], [1]

Record indicator definition, source, reference distribution, accumulation window, spatial scale, update date, category meaning, and uncertainty. Compare precipitation and evaporative demand with streamflow, groundwater, snowpack, soil moisture, lake storage and level, water temperature, habitat, water use, withdrawals, and operations. A regional Drought Monitor category or outlook does not automatically establish local lake condition, restriction, allocation, or emergency status.

Sources: [8], [9], [10]

Preserve air and water measurement location, depth, time, sensor, calibration, shading and exposure; ice-on/off definition and observation method; vertical temperature and oxygen coverage; mixing, inflow, wind, clarity, morphometry and water-level context. Evaluate event duration, seasonal timing, repeated extremes, biological life stages, and monitoring gaps. Do not convert an air-temperature projection directly into a lake threshold or bloom prediction.

Sources: [1], [14], [16]

Record fire perimeter and date, burn severity and uncertainty, watershed and shoreline fraction, vegetation and soil response, hydrologic connectivity, first and later storms, runoff, erosion, debris, sediment, ash, carbon, nutrients, metals, turbidity, reservoir or lake storage, and comparison sites or periods. USGS reports effects ranging from little noticeable change to very large changes; do not assign a universal post-fire lake response.

Sources: [13], [2]

• Record length, start/end choice, season, aggregation, missingness, censoring, and outliers
• Autocorrelation, persistence, multiple comparisons, uncertainty, and practical magnitude
• Instrument, method, station, datum, laboratory, algorithm, and quality-control changes
• Land cover, withdrawals, regulation, outlet operation, infrastructure, management, wildfire, and monitoring changes
• Sensitivity to alternate periods, methods, covariates, and influential events

Sources: [1], [4], [16]

Retain product owner, issue and valid times, update schedule, geographic scale, categories, probabilities, skill or verification information, uncertainty, and intended use. Link operational triggers only to the responsible authority's current plan and corroborating local evidence. Never treat an outlook as a long-term projection or as an instruction to mobilize into unsafe conditions.

Sources: [9], [10]

Retain global and regional model identity/version, experiment, forcing or socioeconomic scenario, ensemble member, initialization where relevant, historical and future periods, variable, temporal resolution, grid, downscaling, bias correction, reference dataset, derived index, and processing. Compare multiple models and plausible futures. Do not label a downscaled value as an observation, assign scenario likelihood without authority, or substitute an ensemble mean for a locally adopted design input.

Sources: [1], [15]

Sources: [15], [1], [16]

Compare independent observations where possible; document calibration and validation periods, residuals, extremes, seasonal and spatial performance, structural uncertainty, sensitivity, disagreement and missingness. Publish data and model versions, scripts or transformation descriptions, intended and prohibited uses, confidence, reviewer, retrieval date, correction path and next review. Aggregate or restrict vulnerable infrastructure, private, cultural, response, and Tribal-governed information.

Sources: [16], [15], [17]