Wind roses give a distribution of wind directions (for the season of training on the lake). Measurements at 10 m are daytime 1 10-minute averages taken every 3 hours over a period of 10 years located within a distance of no more than 20 km of the lake.
1 « Daytime » is every day from 9.00 to 18.00 hours. Hence, these statistics are close but not exactly corresponding to Port Revel's working hours on the lake: from Monday to Friday, from 9.00 to 12.30 and 14.00 to 17.30 hours.
The protected area must be at least 10 000 m2 to be considered operational for manned model training.
Resulting Wind Protected Area (WPA):
When V < 5 m/s, the wind condition is considered "Calm" and 100% of the lake area of 50 400 m2 is "protected", hence available for training.
If the percentage of time for V > 5 m/s is less than 1.5%, the corresponding wind direction is not further considered as this statistical approach is not an exact approach (see note on "Daytime" definition on previous page) and it makes no sense considering very small figures.
The protected lake area can be multiplied by the percentage of time the corresponding wind condition occurs. The resulting protected areas can be added up yielding a total WPA which is presented as a percentage of the lake area. Note that if the wind was < 5 m/s for 100% of the time, the whole 100% of the lake would be considered protected from wind.
At Port Revel, the resulting Wind Protected Area is 81 % of the lake.