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51 S. Forrestal Cir RES20-0122 drainage calcs narrative 9 of 21 2650 ROSSELLE STREET, Suite 2A Jacksonville FL 32204 Ph: 904-551-4945 Civil Design and Construction Management Professionals May 6, 2020 Atlantic Beach Site Drainage Improvements In-Fill Lots Lot Address: 51 Forrestal Circle South Atlantic Beach, FL NARRATIVE: The attached calculations are provided to support the lot drainage design at 51 Forrestal Circle South in the City of Atlantic Beach, FL. The calculations were performed utilizing the equations in the city ordinance sec 24-66(b) and COAB Bulletin 1-20. The referenced project site was vacant and the calculations utilized this as the predevelopment condition. The total lot area shown in the pre and post calculations was calculated from the table in the survey. The proposed project will construct a home, driveway, and stormwater storage facility. The runoff coefficient was provided based on the impervious values and associated coefficients of sec 24-66(b) of the code. _________________________________ Reynold D. Peterson, Sr Project Manager FL P.E. # 84559