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ST. JUDE MEDICAL, INCORPORATED <br />ARDEN HILLS, MN <br />COMM. NO. 8012 <br />DRAINAGE CALCULATIONS <br />ROBERT D. BUROW ARCHITECTS, INCORPORATED <br />750 SOUTH PLAZA DRIVE <br />MENDOTA HEIGHTS, MN <br />DECEMBER 11, 1980 <br />ASSUMPTIONS: <br />- Assume complete Phase III development of site. <br />-100 year rain or ultimate rain is 4" /hour. <br />- Formula Q = A C i (Q= Quantity, A =Area, C =run off factor, i= intensity). <br />AREAS: <br />CALCULATIONS: <br />SITE WATER CONTRIBUTED <br />OFF SITE POND <br />AREA <br />1.5 A.C. <br />TOTAL POND AREA 3.6 A.C. <br />Water contributed by building roof area in 100 year rain: <br />84,952 S.F. x 4/12 = 28,034 FT3 <br />Water contributed by hard surface parking and drives: <br />352,000 x 4/12 = 116,160 FT3 <br />Water contributed by green areas: <br />734,812 x 4/12 x .25 = 60,622 FT3 <br />Total on site pond contribution - 204,816 FT2 <br />BUILDINGS <br />PARKING /DRIVE <br />ON SITE PONDS <br />GREEN <br />PHASE I <br />21,952 S.F. <br />(175) 91,000 S.F. <br />91,476 S.F. (2.1) <br />1,058,812 S.F. <br />PHASE II <br />30,600 S.F. <br />(315) 110,250 S.F. <br />91,476 S.F. (2.1) <br />1,008,962 S.F. <br />PHASE III <br />32,400 S.F. <br />(430) 150,750 S.F. <br />91,476 S.F. (2.1) <br />734,812 S.F. <br />TOTAL <br />84,952 S.F. <br />(920) 352,000 S.F. <br />91,476 S.F. (2.1) <br />734,812 S.F. <br />1.95 A.C. <br />8.08 A.C. <br />2.1 A.C. <br />16.87 A.C. <br />CALCULATIONS: <br />SITE WATER CONTRIBUTED <br />OFF SITE POND <br />AREA <br />1.5 A.C. <br />TOTAL POND AREA 3.6 A.C. <br />Water contributed by building roof area in 100 year rain: <br />84,952 S.F. x 4/12 = 28,034 FT3 <br />Water contributed by hard surface parking and drives: <br />352,000 x 4/12 = 116,160 FT3 <br />Water contributed by green areas: <br />734,812 x 4/12 x .25 = 60,622 FT3 <br />Total on site pond contribution - 204,816 FT2 <br />