Glossary

Everyone

Gauge:: A monitoring station, usually a Water Survey of Canada station, identified by its station ID (for example 02HB001).
Flow status:: Where today's flow sits among past flows for the date: below median (< P50), normal (P50–P75), elevated (P75–P90) or high (> P90).
Normal range:: The shaded band on a chart: the 10th to 90th percentile of past flow for each day of the year, with the median dashed. It is history, not forecast uncertainty.
6-hour block:: The average flow or level over six hours. The forecast is issued in 6-hour blocks and as daily means.
Lead day:: How far ahead a forecast value is: lead day 0 is today.
Unlocked gauge:: A gauge your organisation has taken a plan slot for. Only unlocked gauges show the river forecast.
Natural / total inflow:: At a reservoir, the inflow that would arrive without upstream dams (natural) or with them (total).
Gauge datum:: The local reference level that a gauge's water level is measured from.
RMSE:: Root-mean-square error: the typical size of a level forecast's error, in centimetres.
Threshold line:: A named flow or level your organisation sets for a gauge, drawn on charts and used for emails and reports.
Message level:: The kind of flood message a report is (for example Flood Watch or Flood Warning), set in Report settings.
Termination:: A message level that ends a chain of messages, such as All Clear.
Model card:: A gauge's page of model scores, details and limits.