Close to 11,750ha of forestry was flattened by storm Éowyn in the six worst-hit counties, a leading forestry technology firm has estimated.The calculation is based on an analysis of satellite imagery for counties Galway, Roscommon, Sligo, Leitrim, Longford and Cavan, Garret Mullooly of Treemetrics told a forestry owners’ meeting in Carrick-on-Shannon on Tuesday evening.