Snow Weight - Area (rectangle)

Not Reviewed
Equation / Last modified by KurtHeckman on 2017/03/15 19:51
`"weight" = `
Snow Weight - Area (rectangle)
Variable Instructions Datatype
`(l)"rectangle length"` Length of the rectangular area covered in snow Decimal (m)
`(w)"rectangle width"` Width of the rectangular area covered in snow Decimal (m)
`(D)"Snow depth"` Enter snow depth Decimal (cm)
`(ST)"Snow Type"` Select the snow type Text
Rating
ID
KurtHeckman.Snow Weight - Area (rectangle)
UUID
ce0fc104-aafb-11e3-9cd9-bc764e2038f2
Type of snow or ice(kg/m3)
New snow50-70
Damp new snow100-200
Settled snow200-300
Depth hoar100-300
Wind packed snow350-400
Firn (granular)400-830
Very wet 700-800
Glacier ice830-917

The Weight of Snow on a Rectangular or Square Area calculator computes approximate weight of snow on an rectangular area (e.g. roof) based on the dimensions of the rectangle covered (length times width), the depth of the snow, and the type of snow (based on standard snow types).  

INSTRUCTIONS: Choose your preferred units and enter the following:

  • (L)  This is the length of the rectangular area.
  • (W)  This is the width of the rectangular area.
  • (D) This is the depth of the snow.
  • (ST) This it the type of snow (see list)

Weight of Snow: The weight of the snow is returned in kilograms.  However, this can be automatically converted to other weight units (e.g. pounds or tons) via the pull-down menu.
SnowWeightArearectangle-illustration.png
Related Calculators:

  • To compute the weight of snow on an area, CLICK HERE.
  • To compute the weight of snow on a polygon shaped area, CLICK HERE.
  • To compute the weight of snow on a roof, CLICK HERE.
  • To compute the amount of water in snow laying on land, CLICK HERE.

Notes

Snow Water Equivalent (SWE) is the product of snow depth and snow density. It can be presented in units of either kg/m2 or m:

SWE (`(kg)/(m^2)`) = snow depth (m) x snow density (`(kg)/(m^3)`)
 SWE (m) = snow depth (m) x snow density (`(kg)/(m^3)`) / water density (`(kg)/(m^3)`)

 

You can calculate snow depth from SWE if you know the density of the snow.  Od course, density of snow can range anywhere from 5% when ambient air temperature is 14 F, and can range up to 20% if the temperature is 32 F.

The snow density will increase after the snowfall due to gravitational settling, packing, wind effects, melting and refreezing.

Type of snow or icedensities (kg/m³)
New snow (immediately after falling in calm)50-70
Damp new snow100-200
Settled snow200-300
Depth hoar100-300
Wind packed snow350-400
Firn   (granular snow)400-830
Very wet snow and firn700-800
Glacier ice830-917

The equation will use a median value for the ranges in the density value column.