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Ai A start means either the first placement of permanent construction of a structure on a site, such as the pouring of slab or footings, the installation of piles, the construction of columns, or any work beyond the stage of excavation; or the placement of a manufactured home on a foundation. Permanent construction does not include land preparation, such as clearing, grading and filling; nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footings, piers, or foundations or the erection of temporary forms; nor does it include the installation on the property of accessory buildings, such as garages or sheds not occupied as dwelling units or not part of the main structure. Construction Plans or Drawings - The engineering drawings, specifications, tests, and data necessary to show construction of the improvements. Control Elevation - The lowest elevation at which water can be released through the control device. Detention (or to Detain) - The collection and temporary storage of sto.rmwater in such a manner as to provide for treatment through physical, chemical, or biological processes with subsequent gradual release of the stormwater to the receiving waters, in which the capacity for the specified treated volume of stormwater is restored within 72 hours following a storm event. On-line detention is temporary storage along the axis of the drainage system, whereas "off-line" detention is temporary storage at a location away from the system's direct path. Development Project - Any intentional man -caused change or improvement to land which increases the amount of impervious cover or results in the change in elevation of any portion of the land or changes the existing stormwater system and flood management system. A development project shall include but shall not be limited to all projects which require site plan or subdivision approval under the County Code. Discharge - The outflow of water from a project site, drainage basin or other facility. Drainage System (Artificial) - Any canal, ditch, culvert, dike, storm sewer or other man-made facility which tends to control the surface flow of water. Drainage System (Natural) - Surface streams or marshes which convey water to natural points of drainage. Elevations - Heights in feet expressed in relation to mean sea level and referenced to the National Geodetic Vertical Datum (NGVD) . Estuarine Environment - Those lands contiguous and adjacent to the Indian and Sebastian Rivers where saturation with water is the dominant factor determining the nature of soil development and the types of plant and animal communities living in the soil and on its surface.