hydrology

Close P + I - ET - Q - X = dS over a basin and a window from frozen observational inputs, through the attested computation and its attester: the storage term refused below the GRACE footprint floor, a regulated outlet flagged, imports and exports sourced or explicitly assumed zero, and the residual reported against the combined uncertainty of its terms with both bars stated.

Delineate a basin as a polygon with provenance: a gauge number, a point, or a list of hydrologic unit codes; the NLDI trace (a point snapped through hydrolocation first) or a Watershed Boundary Dataset union; area in an equal-area projection beside the gauge's drainage area; a terminal basin returned with the statement that it has no outlet.

Streamflow drought analysis: day-of-year percentile index at near-natural reference gauges per the drought recipe; regulated gauges refused for drought claims.

Assemble a drought view as a set of receipted panels, each labelled with its product, its run or version and its own refusal: precipitation, soil moisture, streamflow and storage as the quantitative panels, snow as a qualitative one. Carries no number of its own and never reduces the panels to a single index.

GRACE-FO terrestrial water storage to groundwater: TWS anomaly partitioning, what must be subtracted, and the mascon caveats via the pinned podaac snapshot.

Basin-mean evapotranspiration over a frozen polygon from MOD16A2GF or MOD16A2 (the basin term: 8-day composites apportioned to calendar months in mm and km3, the seven fill classes excluded and counted, the masked fraction and the open-water choice stated) and from the OpenET ensemble where a polygon is under the service's per-request area cap (the sub-basin check, refused above the cap), with a receipt.

Load GRACE/GRACE-FO mascon TWS with the volume gate; consults the bundle and restates the applicable gotchas; basin-scale checks.

Load USGS streamflow from the Water Data API through dataretrieval's waterdata module with the volume gate: sites, parameters, windows parsed; approval status and qualifiers surfaced and segregated; provenance summary.

Load a gauge's annual peak record from the Water Data API, export the fixed-width peak file the flood frequency program reads, and read that program's output back. Computes a screening fit only, labelled as one, with an interval on every quantile.

Basin-mean precipitation over a frozen polygon from GPM IMERG V07 (a declared run: final, late or early, one for the window or one per month) or from NLDAS-2 forcing (the gauge-based check): daily and monthly totals in mm and km3, the fraction of grid cells inside the polygon, the run named per month, a change of run or of calibration flagged as a dated seam, an undeclared mix refused, and a receipt.

Load SMAP L3 soil moisture with the volume gate: product line and version parsed, retrieval-quality flags decoded, applicable concepts consulted.

Load SWOT river and lake vector products: parse region/continent, reach or node level, cycles; volume gate; quality decode; scope-aware summary.

USGS streamflow: gauges, daily and continuous values through dataretrieval's waterdata module (the USGS Water Data API), approval status and qualifiers, rating-curve caveats, the legacy Water Services deprecation.

Assemble a receipted timeline of one hydrologic event from several products when a water balance cannot close: every observation carries its product, version, acquisition and production dates and access date; every panel states what that sensor could not see; areas from an optical class product carry the valid fraction; a storage number for a basin below the GRACE footprint floor is refused, and a date is taken from a file rather than from a catalogue search.

Reservoir level and storage-change analysis from gauge elevation per the reservoir recipe; endpoint conventions stated; ARSET satellite complement referenced.

Assemble a reservoir's budget in volume units from captured gauge records and a named area-capacity revision: storage change, gauged inflow and outflow, and a residual that names what is in it. Reports the residual rather than closing the identity, and refuses a volume whose datum or table revision is unstated.

SMAP soil moisture: L3 radiometer products (36 km and enhanced 9 km), retrieval quality flags, the 2015 radar loss and product lineage, L4 model-value-added.

SWOT river and lake products: RiverSP reach vs node scope, LakeSP obs/prior, raster water masks, zipped-shapefile access, discharge products.