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


With the national annex ÖNORM B 1991-1-3: 2018-12, Austria has redrafted the width of the tolerance zones textually.

[1] In the third paragraph under the heading "Annex B", the standard accordingly states 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 a 250 m per side. This results in a tolerance zone width of 2 x 2.5 km = 5 km inland and of 2 x 250 m = 500 m in Vienna.

→ See Snow Load Map of Austria

This guideline was applied when updating to ÖNORM B 1991-1-3: 2018-12 on our website Snow, Wind and Seismic Zones.


transition zone tolerance zone on both sides

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