Snow Pack Data Fields (SWMM)
Snow Pack data can be edited on either the Snow Pack Grid Window of the Subcatchments Grid or the Snow Pack Property Sheet.
All Snow Pack data can be edited on the grid or the property sheet.
The following table describes all the data fields used to define a Snow Pack object.
Common Data Fields Fields that are common to the majority of objects can be found in the Common Fields topic.
Snow Pack Data
Database Table Name: sw_snow_pack
|
Field Name |
Help Text |
Database Field |
Size |
Precision |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Snow pack ID |
A unique identifier for the Snow Pack. This field is used to associate a Snow Pack with a particular Subcatchment. |
ID |
Text |
254 |
|
0 |
|
|
|
|
|
|
Plowable min. melt coefficient |
Minimum melt rate on December 21st for the ploughable fraction of snow covered impervious areas when there is no rainfall. |
plow_min_melt |
Double |
|
RCF |
3 |
0.04572 mm/hr-C |
0 |
|
|
|
|
Plowable max. melt coefficient |
Maximum melt rate on June 21st for the ploughable fraction of snow covered impervious areas when there is no rainfall. |
plow_max_melt |
Double |
|
RCF |
3 |
0.04572 mm/hr-C |
0 |
|
|
|
|
Plowable base temperature |
Temperature above which the melting of the ploughable fraction of snow covered impervious areas will occur. |
plow_base_temp |
Double |
|
CF |
1 |
0 degC |
-273 |
100 |
|
|
|
Plowable fraction free water capacity |
Fraction of snow depth that free water occupies in the ploughable area. |
plow_free_water |
Double |
|
|
2 |
0.1 |
0 |
1 |
|
|
|
Plowable initial snow depth |
Initial snow depth for the ploughable area. |
plow_snow_depth |
Double |
|
RD |
2 |
0 |
0 |
|
|
|
|
Plowable initial free water |
Depth of melted water contained in the ploughable area at the start of the simulation. Note that this should be at or below the product of the ploughable initial snow depth and the ploughable fraction free water capacity. |
plow_initial_free_water |
Double |
|
RD |
0 |
0 |
0 |
|
|
|
|
Fraction of impervious area ploughable |
The fraction of the total impervious area for the subcatchment that will be subject to snow removal processes. |
fraction_ploughable |
Double |
|
|
3 |
0 |
0 |
1 |
|
|
|
Impervious min. melt coefficient |
Minimum melt rate on December 21st for the non-ploughable fraction of snow covered impervious areas when there is no rainfall. |
imp_min_melt |
Double |
|
RCF |
3 |
0.04572 mm/hr-C |
0 |
|
|
|
|
Impervious max. melt coefficient |
Maximum melt rate on June 21st for the non-ploughable fraction of snow covered impervious areas when there is no rainfall. |
imp_max_melt |
Double |
|
RCF |
3 |
0.04572 mm/hr-C |
0 |
|
|
|
|
Impervious base temperature |
Temperature above which, melting of the non-ploughable fraction of snow covered impervious areas will occur. |
imp_base_temp |
Double |
|
CF |
1 |
0 |
-273 |
100 |
|
|
|
Impervious fraction free water capacity |
Fraction of snow depth that free water occupies. |
imp_free_water |
Double |
|
|
2 |
0.1 |
0 |
1 |
|
|
|
Impervious initial snow depth |
Initial snow depth for the impervious area. |
imp_snow_depth |
Double |
|
RD |
2 |
0 |
0 |
|
|
|
|
Impervious initial free water |
Depth of melted water held within the impervious area at the start of the simulation. This number should be at or below the product of the impervious initial snow depth and the impervious fraction free water capacity. |
imp_initial_free_water |
Double |
|
RD |
2 |
0 |
0 |
|
|
|
|
Impervious depth at 100% cover |
Depth below which the Areal Depletion Curve (defined in the Snow Parameters Property Sheet) for impervious surface for applies. |
imp_100_cover |
Double |
|
RD |
0 |
|
0 |
|
|
|
|
Pervious min. melt coefficient |
Minimum melt rate on December 21st for snow covered pervious areas when there is no rainfall. |
perv_min_melt |
Double |
|
RCF |
3 |
0.04572 mm/hr-C |
0 |
|
|
|
|
Pervious max. melt coefficient |
Maximum melt rate on June 21st for snow covered pervious areas when there is no rainfall. |
perv_max_melt |
Double |
|
RCF |
3 |
0.04572 mm/hr-C |
0 |
|
|
|
|
Pervious base temperature |
Temperature above which snowmelt for snow covered pervious areas will occur. |
perv_base_temp |
Double |
|
CF |
1 |
0 degC |
-273 |
100 |
|
|
|
Pervious fraction free water capacity |
Fraction of snow depth that free water occupies. |
perv_free_water |
Double |
|
|
2 |
0.1 |
0 |
1 |
|
|
|
Pervious initial snow depth |
Initial snow depth for the snow covered pervious area. |
perv_snow_depth |
Double |
|
RD |
2 |
0 |
0 |
|
|
|
|
Pervious initial free water |
Depth of melted water held within the pervious area at the start of the simulation. This number should be at or below the product of the pervious initial snow depth and the pervious fraction free water capacity. |
perv_initial_free_water |
Double |
|
RD |
0 |
0 |
0 |
|
|
|
|
Pervious depth at 100% cover |
Depth below which the Areal Depletion Curve (defined in the Snow Parameters Property Sheet) for pervious surface applies. |
perv_100_cover |
Double |
|
RD |
0 |
0 |
0 |
|
|
|
|
Depth at which snow removal begins |
Depth above which removal ploughing processes occur on ploughable surfaces. |
plow_depth |
Double |
|
RD |
2 |
25.4 mm |
0 |
|
|
|
|
Fraction transferred out of the catchment |
Fraction of ploughed snow that is transferred out of the network. |
out_of_watershed |
Double |
|
|
3 |
0 |
0 |
1 |
|
|
|
Fraction transferred to the impervious area |
Fraction of ploughed snow that is transferred to the impervious area of the subcatchment. |
to_impervious |
Double |
|
|
3 |
0 |
0 |
1 |
|
|
|
Fraction transferred to the pervious area |
Fraction of ploughed snow that is transferred to the pervious area of the subcatchment. |
to_pervious |
Double |
|
|
3 |
0 |
0 |
1 |
|
|
|
Fraction converted into immediate melt |
Fraction of ploughed snow that is converted to immediate melt on the ploughable area of the subcatchment. |
to_immediate_melt |
Double |
|
|
3 |
0 |
0 |
1 |
|
|
|
Fraction moved to another subcatchment |
Fraction of ploughed snow that is moved to another subcatchment (identified in the Subcatchment ID field). |
to_subcatchment |
Double |
|
|
3 |
0 |
0 |
1 |
|
|
|
Subcatchment ID |
The fraction of ploughed snow defined in the Fraction moved to another subcatchment field will be moved to this subcatchment. If used, this field must be set to the name of a subcatchment in the network that also has a snowpack. This field will be disabled if Fraction moved to another subcatchment is zero. |
subcatchment_id |
Text |
254 |
|
3 |
|
|
|
|
|
