Eurocode 1 Part 1-4 (EN 1991-1-4) is notoriously rigorous. Calculating wind loads involves determining wind speed, directional factors, terrain categories, roughness factors, pressure coefficients, and net pressure calculations.
[ w_e = q_p(z_e) \cdot c_pe ]
For vertical walls: multiple zones (A, B, C, D, E) depending on wind direction. wind load calculation excel sheet eurocode
The spreadsheet includes lookup tables for ( c_pe ) based on ( h/d ) ratio. Eurocode 1 Part 1-4 (EN 1991-1-4) is notoriously rigorous
[ q_b = \frac12 \rho \cdot v_b^2 ]
Excel:
q_b = 0.5 * rho * v_b^2