In this subtitle, the following terms have the meanings indicated. “Approval” means a documented action by the Department following a comprehensive review to determine and acknowledge that submitted materials demonstrate compliance with the requirements of a specified stage in a project’s development process. “Approval” does not include an acknowledgment by the Department that material has been received for review. “Drainage area” means an area, measured in a horizontal plane, that:contributes runoff to a single point; and is enclosed by a ridge line. “Stabilization” means the protection of exposed soils from erosion by the application of seed and mulch, seed and matting, sod, other vegetative measures, or structural means. Ord. 13-095