Step 6 of 8
Living Snow Fence Case Study: Gaylord, MN
  Introduction
  Snowfall
  Wind Direction
  Fetch Distance
  Snow Water Equiv.
  Snow Transport
Porosity
  Attack Angle
  Setback
  Conclusions
  References



The porosity of the snow fence determines fence's snow storage capacity.

The table to the right gives the porosity fraction for various snow fences and the resulting snow storage capacity (Qc). Qc is calculated using the formula on the right.

For the case study at Gaylord, the porosity for the standing corn was 0.50. Assuming the corn height to be 6.5 ft (1.98 m), the snow storage capacity was 38.2 t/m for each 8-row strip. Therefore, for the two strips, the total Qc is approximately 76.4 t/m.


 


Porosity
Type of Fence
Porosity
Solid Fence
0.0
Double Shrub Row
0.275
Structural Snow Fence
0.50
Single Deciduous Tree Row
0.70
6-8 Rows Standing Strips of Corn 0.50

Snow Storage Capacity Formula

Qc/H2.2 = (3 + 4P + 44P2 - 60P3)

  • Qc is snow storage capacity in t/m.
  • H is the fence height in meters.
  • P is the porosity percentage of the fence.