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Lockeford Springs Golf Course Drainage Calculations Project area: 176.3 acres = 7,579,628 sq. ft. �a 0 SIpy4! less Bear Creek drainage z 650,000 sq. ft. y net project area = 7,029,628 sq. ft. JO PH A `A- There 1s no concentrated drainage into Bear CreekUNG Is- Constants used in calculations: Na 23525 9 runoff zone 1, rural = 3.24 In. = 0.27 ft. ER/, r/9� runoff coefficients: r VtC ALIF `� pond = 1.00 9rE 0r C ��`$ paving = 0.95 r9 building = 0.80 gravel a 0.75 lawn of landscaping = 0.20 Capacity formula: area(sq.ft.) X coefficient x runoff x 2 = pond capacity needed Area Calculations Note: calculated ft. sq. (ie. a square - x ft. on a side) Q 1 ft. depth Is the minimum drainage swaie area required to contain runoff on site. Area 1: turf = 468,000 sq.ft. x 0.20 x 0.27 = 25,272 cu. ft. x 2 = 50,544 cu, ft. = 224 ft.sq. (a 1 ft. depth Area 2: turf = 455,000 sq, ft, x 0.20 x 0.27 = 24,370 cu. ft. x 2 = 49,140 cu. ft. = 220 ft.sq. Q 1 ft. depth Area 3: road = 27,500 sq. ft. x 0.95 x 0.27 = 8,925 cu. ft. parking = 75,000 sq. ft. x 0.95 x 0.27 = 19,237 cu. ft. buildings = 13,000 sq. ft. x 0.80 x 0.27 = 2,808 cu. ft. patio = 2,600 sq. ft. x 0.95 x 0.27 = 8615 cu. ft. lake = 100,000 sq. ft. x 9.00 x 0.27 = 27,000 cu. ft. turf = 551,900 sq. ft. x 0.20 x 0.27 = 29,802 cu. ft. total = 86,436 cu. ft. x 2 = 172,876 cu, ft. 1.75 ft. extra lake depth (at surface) req. Area 4: lake = 52,500 sq, ft. x 1.00 x 0.27 = 14,175 cu, ft. building = 4,800 sq. ft. x 0.80 x 0.27 = 1,037 cu. ft. gravel = 45,000 sq. ft. x 0.75 x 0.27 = 9,112 cu. ft. turf = 6,700 sq. ft. x 0.20 x 0.27 = 361 cu. ft. total = 24,885 cu. ft.