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Rain: Sub Hourly

Definition: Record of the amount of precipitation within a given period. This data is taken from the RAIN_RATE table.

This datatype enables the selection of rain for sub-hourly periods in a sub-menu. The periods are (minutes): 30, 20, 15, 12, 10, 6, 5, 4, 3, 2.

Care should be taken by the user to include minutes in the date/time format.

This procedure is processor intensive and can produce a lot of data.

Field Descriptions

AMOUNT: The amount of rainfall for the given period in mm.

PERIOD: The period over which the amount is measured. The displayed periods are (minutes): 30min = 0.5000hrs, 20 min = 0.3333hrs, 15min = 0.2500hrs, 12min = 0.2000, 10min = 0.1667hrs, 6min = 0.1000hrs, 5min = 0.0833hrs, 4min = 0.0667hrs, 3min = 0.0500hrs, 2min = 0.0333hrs.

FREQUENCY: "V" for variable.

• "O" = Digitised from Dynes rainfall charts (Pluviographs). This method has now been largely superseded by the "P" origin (Jan 2005).
• "P" = Scanned from Dynes rainfall charts (Pluviographs). This method is now (Jan 2005) the primary method for digitising pluviographs.
• "R" RIG (Rainfall Intensity Gauge) - 6 sec resolution. The rain is passed through a tube to produce equi-sized drops and the drops are counted. Many of NIWA's Clitel stations now include RIG gauges.
• "Q" = Hydra - 15 sec resolution. This gauge uses a similar principle to the RIG gauges. It is now superseded in most cases by the RIG.

See also:

• Rain: Fixed Period
• Rain: Details
• Water Balance Details
• Hourly Rain Oracle Error ORA-06532 Subscript outside of limit