Climate

Precipitation is always included in the data tree.

Include snow melt

If snowmelt is included, then Evapotranspiration must also be specified in the Simulation Specification (V1 p. 182) dialog. When snow melt is included, then a new Snow Melt (V1 p. 239) section is added to the data tree where the various snow melt parameters can be specified.

Include melting due to short wave radiation - When the Snow melt option is selected, then the check box for radiation melting will become editable. This option will add a new section to the climate data for incoming short wave radiation. Also added will be an item in the Snow Melt (V1 p. 239) section for the Melting Coefficient for Solar Radiation (V1 p. 241), which defines the rate at which the snow melts per unit of incoming radiation.

Elevation corrections

Correct precipitation for elevation - In mountainous areas, precipitation can vary significantly with elevation - especially on the windward side of the mountains. However, there are rarely enough rain gauging stations to measure this spatial variability of rainfall. Choosing to correct the precipitation for elevation allows you to define a spatially variable correction factor, if you are using station-based rainfall data. See Precipitation Lapse Rate (V1 p. 232) for the correction equations.

Correct temperature for elevation - In mountainous areas, temperature varies significantly with elevation. Choosing to correct the temperature for elevation allows you to define a spatially variable correction factor, if you are using station-based temperature data. See Temperature Lapse Rate (V1 p. 237) for the correction equations.

Use both wet and dry lapse rates for temperature correction - The moisture content of the air is a significant factor for the elevation correction of temperture. If this option is chosen, then you can specify a different correction factor for the time steps when it is raining.