Why are the tolerance zones between the zone borders 5 km wide on the online snow load map of Austria?

Answer

With the National Annex ÖNORM B 1991‑1‑3: 2018‑12, Austria has textually redrafted the width of tolerance zones.

[1] In the third paragraph under "Annex B," the standard states accordingly that within 2.5 km on both sides of the zone boundary, the characteristic value sk is the average of the affected zones. In the area of Vienna, we can assume 250 m per side. This results in the tolerance zone width of 2 x 2.5 km = 5 km in the country and 2 x 250 m = 500 m in Vienna.

→ See Snow Load Map of Austria

This regulation was applied with the update of ÖNORM B 1991‑1‑3: 2018̩12 on our website Snow, Wind and Seismic Zones.

Keywords

Transition zone Tolerance zone On both sides

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