 ## Covered Surface

Barrier Ball® is composed of spheres that are autoconfigured in such a way that the covered liquid surface is always 91% regardless of the diameter of the sphere. This is calculated as follows:

• Equilateral triangle Area ABC (A1)
A1 = (√3·r²)/4
• Area A-e-d (S1)
S1 = ½ · R ² · Ѳ (where r is the radius of the sphere and Ѳ = π/3)
S1 = ½·r²· π/3
S1 = π·r²/6
• Outdoor Area (S2)
S2 = A1 – 3·S1
S2 = r²·(√3-π/2)
##### Therefore, BarrierBall® coverage is 91% (100%  Ad) ## Wind Resistance

Wind is one of the main factors influencing evaporation, the inner weight of the barrier Ball spheres makes them resistant to the wind in such a way that the system maintains its effectiveness in the presence of it.

• P = (Cd * Ro  *  V2) / 2
P = Wind pressure (N/m2)
Ro = dry air density = 1,223 Kg/m3 (1ATM and 15 º C)
V = Wind velocity (m/s)
Cd = aerodynamic coefficient of resistance to advance = 1.17 (flat surface)
= 0.50 (Sphere)/0.25 (half-sunken sphere)
= 0.05 (aerodynamic surface)