Snow Parameters
To view and edit Global Snow Parameters used for modelling snow fall and snow melt in the Property Sheet select Model parameters | Snow parameters from the Model menu.
For further information on the use of these parameters when simulating snow melt, see the Snow Melt Model topic.
The Object Properties Window for Snow Parameters contains the following information:
Database Table Name: hw_snow_parameters
|
Field Name |
Help Text |
Database Field |
Size |
Precision |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dividing temperature between snow rain |
Precipitation (defined on the Rainfall tab of the Rainfall Event) will be treated as rain, above this temperature. At or below this temperature, precipitation will be treated as snow. Built-in default = 1.111 °C (34 °F). Valid range = -273 °C to °100 C. |
snow_temperature |
Double |
|
CF |
3 |
1.11111 |
-273 |
100 |
|
|
|
Antecedent temperature index weight |
Weight used to calculate antecedent temperature index. Built-in default = 0.5 Valid range = 0 to 1 Negative melt ratio Ratio of negative melt coefficient to melt coefficient. Built-in default = 0.6 Valid range = 0 to 1 |
antecedent_temp_idx |
Double |
|
|
3 |
0.5 |
0 |
1 |
|
|
|
Negative melt ratio |
Ratio of an area's current snow depth to the depth at which there is 100% areal coverage. |
negative_melt_ratio |
Double |
|
|
3 |
0.6 |
0 |
1 |
|
|
|
Catchment elevation |
Average elevation of the catchment above sea level. Built-in default = 0 mAD Valid range = -99 to 9999 mAD Curves defining the relationship between the area of surface that remains snow covered and snow pack depth. |
elevation |
Double |
|
Z |
3 |
0 |
-9999 |
9999 |
|
6000 |
|
Areal depletion curves |
This field contains a series of records defining the relationship between the area that remains snow covered and snow pack depth for both impervious and pervious surfaces. These are entered on the Areal Depletion Curves Editor which is displayed by clicking on the |
adc |
Array |
|
|
|
|
|
|
button.