Gulf Breeze is located within the Highland Bayou watershed, generally drains from the southwest to the northeast in a sheet flow pattern which contributes stormwater runoff to the Jay Road ditch, and ultimately discharges to the Highland Bayou diversion channel.  Given prevalent concerns about the limited existing capacity of the Jay Road ditch, the project engineering firm has developed a preliminary drainage model of the Gulf Breeze project site using Atlas 14 100-yr rainfall intensities to determine the hydrology and runoff rates for the region, and then utilized 2018 LiDAR to analyze the hydraulics in the area.  This drainage model was run under existing conditions, as well as an iterative proposed conditions (post site development) state to schematically analyze the amount of detention that would be necessary to develop the tract and prevent any adverse impacts upstream, downstream, or adjacent to the property.  This preliminary analysis has revealed that a detention storage rate of approximately 1.05 acre-feet per acre of development will be necessary to mitigate for the increased runoff and sheet flow storage volume lost due to the proposed development of the site.  The attached preliminary land plan for the site provides over 57 acres of interconnected detention and drainage areas to provide the area necessary for this storage volume.  In the current proposed condition, adjacent properties are expected to experience a minor reduction in sheet flow flooding across their tracts, since the site would capture over 12-inches of rainfall that occurs within the property and prevent it from cascading downstream onto neighboring properties.