Snow Pack Data Fields (InfoWorks)

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: hw_snow_pack

Show Columns

Database Names

Size, Type and Units

Defaults and Error Limits

Field Name

Help Text

Database Field

Data Type

Size

Units

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

64

 

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 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 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 depth at 100% cover

Depth below which the Areal Depletion Curve (defined in the Snow Parameters Property Sheet) for impervious surface for applies.

imp_snow_depth

Double

 

RD

2

0

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

 

 

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 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 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 depth at 100% cover

Depth below which the Areal Depletion Curve (defined in the Snow Parameters Property Sheet) for pervious surface applies.

perv_snow_depth

Double

 

RD

2

0

0

 

 

 

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

 

 

Ploughable base temperature

Temperature above which, melting of the ploughable fraction of snow covered impervious areas will occur.

plough_base_temp

Double

 

CF

1

0 degC

-273

100

 

 

Depth at which snow removal begins

Depth above which removal ploughing processes occur on ploughable surface.

plough_depth

Double

 

RD

2

25.4 mm

0

 

 

 

Ploughable fraction free water capacity

Fraction of snow depth that free water occupies.

plough_free_water

Double

 

 

2

0.1

0

1

 

 

Ploughable max. melt coefficient

Maximum melt rate on June 21st for the ploughable fraction of snow covered impervious areas when there is no rainfall.

plough_max_melt

Double

 

RCF

3

0.04572 mm/hr-C

0

 

 

 

Ploughable min. melt coefficient

Minimum melt rate on December 21st for the ploughable fraction of snow covered impervious areas when there is no rainfall.

plough_min_melt

Double

 

RCF

3

0.04572 mm/hr-C

0

 

 

 

Ploughable depth at 100% cover

Depth below which Areal Depletion Curves apply. (Not used in simulation.)

plough_snow_depth

Double

 

RD

2

0

0

 

 

 

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 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 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

 

 

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

64

 

3

 

 

 

 

 

Subcatchments Grid

Property Sheets

Snow Melt Model

Snow Parameters