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THE SAVOY - FDP230012 - DOCUMENT MARKUPS - ROUND 1 - DRAINAGE REPORT
PRELIMINARY DRAINAGE REPORT THE SAVOY FORT COLLINS, COLORADO SEPTEMBER 14, 2022 NORTHERNENGINEERING.COM 970.221.4158 FORT COLLINS GREELEY This Drainage Report is consciously provided as a PDF. Please consider the environment before printing this document in its entirety. When a hard copy is necessary, we recommend double-sided printing. CHARACTER OF SURFACE1: Percentage Impervious 2-yr Runoff Coefficient 10-yr Runoff Coefficient 100-yr Runoff Coefficient Developed Asphalt .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………100%0.95 0.95 1.00 Concrete .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………100%0.95 0.95 1.00 Rooftop .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………90%0.95 0.95 1.00 Gravel .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………40%0.50 0.50 0.63 Pavers .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………40%0.50 0.50 0.63 Landscape or Pervious Surface Playgrounds .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………25%0.35 0.35 0.44 Lawns Clayey Soil .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………2%0.25 0.25 0.31 Lawns Sandy Soil .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………2%0.15 0.15 0.19 Notes: Basin ID Basin Area (ac) Area of Asphalt (ac) Area of Concrete (ac) Area of Rooftop (ac) Area of Gravel (ac) Area of Pavers (ac) Area of Playgrounds (ac) Area of Lawns (ac) Composite % Imperv. 2-year Composite Runoff Coefficient 10-year Composite Runoff Coefficient 100-year Composite Runoff Coefficient A1 0.17 0.00 0.00 0.13 0.00 0.00 0.00 0.03 73% 0.81 0.81 0.86 A2 0.46 0.00 0.37 0.03 0.00 0.00 0.00 0.06 87% 0.86 0.86 0.91 A3 0.64 0.00 0.51 0.03 0.00 0.00 0.00 0.11 83% 0.83 0.83 0.88 A4 0.17 0.00 0.00 0.13 0.00 0.00 0.00 0.03 72% 0.81 0.81 0.86 A5 0.27 0.00 0.01 0.20 0.00 0.00 0.00 0.06 72% 0.80 0.80 0.86 A6 0.19 0.00 0.01 0.10 0.00 0.00 0.00 0.08 56% 0.67 0.67 0.73 A7 0.36 0.00 0.33 0.00 0.00 0.00 0.00 0.03 92% 0.89 0.89 0.94 A8 0.52 0.00 0.47 0.00 0.00 0.00 0.00 0.05 91% 0.88 0.88 0.93 A9 0.63 0.00 0.21 0.18 0.00 0.00 0.00 0.23 61% 0.69 0.69 0.74 A10 0.51 0.00 0.45 0.00 0.00 0.00 0.00 0.06 89% 0.87 0.87 0.92 A11 0.60 0.00 0.46 0.00 0.00 0.00 0.00 0.14 77% 0.79 0.79 0.84 A12 0.24 0.00 0.00 0.20 0.00 0.00 0.00 0.04 77% 0.85 0.85 0.90 ODP1 0.45 0.27 0.00 0.00 0.00 0.00 0.00 0.18 60% 0.67 0.67 0.72 ODP2 0.90 0.27 0.09 0.26 0.00 0.00 0.00 0.28 67% 0.73 0.73 0.79 ODP3 0.25 0.04 0.06 0.04 0.00 0.00 0.00 0.11 57% 0.66 0.66 0.71 B1 0.25 0.00 0.01 0.13 0.00 0.00 0.00 0.11 52% 0.64 0.64 0.70 B2 0.51 0.00 0.48 0.00 0.00 0.00 0.00 0.04 93% 0.90 0.90 0.95 B3 0.58 0.00 0.48 0.00 0.00 0.00 0.00 0.10 82% 0.82 0.82 0.88 B4 0.25 0.00 0.00 0.20 0.00 0.00 0.00 0.04 75% 0.83 0.83 0.88 B5 0.39 0.00 0.01 0.26 0.00 0.00 0.00 0.11 65% 0.75 0.75 0.80 B6 0.17 0.00 0.01 0.00 0.00 0.00 0.00 0.17 7% 0.29 0.29 0.35 BF1 1.16 0.00 0.44 0.19 0.00 0.00 0.00 0.53 54% 0.63 0.63 0.69 MAJOR BASIN A, ODP2, and ODP3 5.93 0.31 3.01 1.32 0.00 0.00 0.00 1.30 76% 0.80 0.80 0.85 MAJOR BASIN A 4.78 0.00 2.92 1.01 0.00 0.00 0.00 0.85 80% 0.83 0.83 0.88 MAJOR BASIN B & BF1 3.31 0.00 1.43 0.79 0.00 0.00 0.00 1.10 65% 0.72 0.72 0.77 MAJOR BASIN B 2.15 0.00 0.98 0.60 0.00 0.00 0.00 0.57 71% 0.76 0.76 0.82 DEVELOPED BASIN % IMPERVIOUSNESS AND RUNOFF COEFFICIENT CALCULATIONS 2) Runoff Coefficients are taken from the Fort Collins Stormwater Criteria Manual, Chapter 3. Table 3.2-1 and 3.2-2 1) Percentage impervious taken from the Fort Collins Stormwater Criteria Manual, Chapter 5, Table 4.1-2 and Table 4.1-3 Combined Basins