Following is the appearance of the Meteorology tab of the Catchment Coefficients dialog:
Refer to the main Catchment Coefficients page for information on other categories of coefficients. To save the changes made when closing this dialog, click OK. To ignore changes, click Cancel.
Following is a description of the coefficients associated with Meteorology.
Meteorological File is the source of meteorology data used for this catchment. Click on the Select button to choose a file.
Precipitation weighting factor is a multiplier applied to the precipitation in the meteorological file to account for local variations in precipitation amount from orographic effects. (varies from 1, unitless)
Average Temperature Lapse is the average amount subtracted from the temperature in the meteorological file to account for regional variations in temperature from orographic effects. A positive value indicates that the catchment is cooler than its meteorological station. (varies from 0, degrees C)
Altitude Temperature Lapse is the average decrease in temperature with increasing elevation (0 – 0.01 C/m)
General or Rain and Fine Particle Air Chemistry File is the source of air and rain chemistry data used for this catchment. Click on the Select button to choose a file for the catchment.
Coarse Particle Air Chemistry File (optional) is the source of coarse particle air chemistry data (optional). Click on the Select button to choose a file for the catchment.
When the Apply Changes To Selected Catchments button is checked, changes made to the coefficients of the catchment being edited will be made to all selected catchments. When the Apply Changes To All Catchments button is checked, changes made to the coefficients of the catchment being edited will be made to all catchments.