The basic wind speed is specified at a height ‘h’ above mean ground level in an open terrain. The value of’h’ is__________________? January 20, 2019 – by admin The basic wind speed is specified at a height ‘h’ above mean ground level in an open terrain. The value of’h’ is__________________? A. 10 m B. 20 m C. 25 m D. 50 m