Wind zones

Tecnopali: wind zones. To determine the capacity of the poles, it is necessary to know:

  • installation area;
  • terrain category.

By consulting the specific tables of each Tecnopali pole, it is possible to determine the maximum range of the pole based on wind zones.

Installation areas

Zone 1

1000 s.l.m. VrefO 25 m/s

Valle d’Aosta, Piemonte, Lombardia, Trentino Alto Adige, Veneto, Friuli V. G.

Zone 2

750 s.l.m. VrefO 25 m/s

Emilia Romagna

Zone 3

500 s.l.m. VrefO 27 m/s

Toscana, Marche, Umbria, Lazio, Abruzzo, Molise, Campania, Puglia, Basilicata, Calabria

Zone 4

500 s.l.m. VrefO 28 m/s

Sicily and province of Reggio Calabria

Zone 5

750 s.l.m. VrefO 28 m/s

Sardinia (area to the east of the line connecting C. Teulada and La Maddalena Island)

Zone 6

500 s.l.m. VrefO 28 m/s

Sardinia (area to the west of the line connecting C. Teulada and La Maddalena Island)

Zone 7

1000 s.l.m. VrefO 28 m/s


Zone 8

1500 s.l.m. VrefO 30 m/s

Province of Trieste

Zone 9

500 s.l.m. VrefO 31 m/s

Islands (with the exception of Sicily and Sardinia) and open sea

For flow rates higher than those indicated in the aforementioned tables, or for installations higher than reference heights above sea level, you need to contact the headquarters' commercial office.

Terrain category

Tecnopali wind zones: marine coast area i

I Marine coast. Lake coast with windward length of at least 5 km. Flat ground, without obstacles.

Tecnopali wind zones: agricultural cultivated area ii

II Cultivated land surrounded by hedges, some small agricultural buildings, houses or trees.

Tecnopali wind zones: industrial suburban forests area iii

III Suburban or industrial areas and permanent forests.

Tecnopali wind zones: urban area iv

IV Urban areas where at least 15% of the surface is covered with buildings with an average height greater than 15 m.

Soil roughness class

A. Urban areas where at least 15% of the surface is covered by buildings whose height exceeds 15 m.

B. Urban (non-class A), suburban, industrial and wooded areas.

C. Areas with widespread obstacles (trees, houses, walls, fences, etc.); areas with roughness not attributable to classes A, B, D.

D. a) Sea and its coastal strip (within 2 km from the coast);

b) Lakes (with a maximum width of at least 1 km) and relative coastal strip (within 1 km from the coast)

c) Areas without obstacles or with mostly isolated obstacles (open countryside, airports, agricultural areas, pastures, marshy or sandy areas, snowy or icy surfaces, seas, lakes, etc.).

The assignment of the roughness class does not depend on the terrain's orographic and topographical conformation. It can be assumed that the site belongs to class A or B, provided that the building located in the area is opposed for at least 1 km (or in no case for less than 20 times the height of the building) to all wind origin directions with an amplitude of minimum 30°. It must be assumed that the area belongs to class D, if the construction is in the areas indicated with letters a) or b) or within a radius of 1 km from it the wind directions have an amplitude of minimum 30°, where 90% of the land is indicated with letter c). Should any doubt arise about the choice of the roughness class, the most unfavorable class must be assigned (the action of the wind is generally minimum in class A and maximum in class D).

Tecnopali soil roughness classes

Ref.: Tecnopali

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