correct_precip
Author:
Keith Cherkauer
Date:
May 21, 1997
Description:
This routine corrects precipitation for gauge catch deficiencies. Gauge
undercatch is a well-known problem, and is highly significant in snow
measurement. This subroutine uses an equation fit through an empirical
relationship between windspeed an gauge undercatch.
WARNING: Use this subroutine only if the data you are using has not already
been corrected for gauge undercatch.
References
Bras, R., "Hydrology: An Introduction to Hydrologic Science," Addison-Wesley Publishing Co, Menlo Park, CA, 1990: Figure 4.16
Input Variables:
Variable | Type | Units | Description |
| rain | double * | mm | Current total precipitation (rain plus snow) on grid cell |
| rainonly | double * | mm | Current rain on grid cell |
| wind | double | m/s | Wind speed |
Output Variables:
Variable | Type | Units | Description |
| rain | double * | mm | Corrected total precipitation (rain plus snow) on grid cell |
| rainonly | double * | mm | Corrected rain on grid cell |
Subroutines Called:
Modifications and Limitations
The undercatch correction for wind speeds over 9 m/s is equal to that of 9 m/s,
because the data used in the fitting process do not extend beyond 9 m/s, and
the equation fails.
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