Use this hydrology calculation to summarize measured river discharge or its empirical distribution over a defined record and time basis.

Current flow

Required number input.

Historical flows

Required list input.

Ensemble members

Required list input.

Compare current river flow with historical percentiles and a forecast ensemble range. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Flow context

The resulting flow context returned as an object.

• River-flow results depend on rating curves, gauging quality, missing values, record length, seasonality, regulation, catchment change, and percentile convention. Historical percentiles are not guaranteed future flows or flood-frequency estimates.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Retain station metadata and period of record, inspect hydrographs and data quality flags, and use jurisdictional hydrologic methods for design decisions.

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