2026 02 12 Crestmont CC and Eagle Rock Ave Stormwater Management Report

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Impervious Hyd. No. 66 Hydrograph Type = NRCS Runoff Peak Flow = 1.623 cfs Storm Frequency = 2-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 5,271 cuft Drainage Area = 0.48 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 2.0 min Total Rainfall = 3.46 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.623 cfs 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 Q (cfs) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Hyd. No. 67 Hydrograph Type = Junction Peak Flow = 2.706 cfs Storm Frequency = 2-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 11,716 cuft Inflow Hydrographs = 63, 64, 65, 66 Total Contrib. Area = 2.01 ac Qp = 2.706 cfs 3 2 Q (cfs) 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs) PR-2C-U Open Space C PR-2C-U Woods C PR-2C-U Gravel C PR-2C-U Impervious PR-2C-U

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Open Space C Hyd. No. 63 Hydrograph Type = NRCS Runoff Peak Flow = 1.567 cfs Storm Frequency = 10-yr Time to Peak = 12.22 hrs Time Interval = 1 min Runoff Volume = 6,675 cuft Drainage Area = 0.68 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 16.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.567 cfs 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 Q (cfs) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Woods C Hyd. No. 64 Hydrograph Type = NRCS Runoff Peak Flow = 1.531 cfs Storm Frequency = 10-yr Time to Peak = 12.22 hrs Time Interval = 1 min Runoff Volume = 6,572 cuft Drainage Area = 0.77 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 16.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.531 cfs 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 Q (cfs) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Gravel C Hyd. No. 65 Hydrograph Type = NRCS Runoff Peak Flow = 0.383 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 1,126 cuft Drainage Area = 0.08 ac Curve Number = 89.00 Tc Method = User Time of Conc. (Tc) = 2.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.383 cfs 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 Q (cfs) 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Impervious Hyd. No. 66 Hydrograph Type = NRCS Runoff Peak Flow = 2.537 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 8,400 cuft Drainage Area = 0.48 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 2.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.537 cfs 3 2 Q (cfs) 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Hyd. No. 67 Hydrograph Type = Junction Peak Flow = 5.133 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 22,774 cuft Inflow Hydrographs = 63, 64, 65, 66 Total Contrib. Area = 2.01 ac Qp = 5.133 cfs 6 5 4 Q (cfs) 3 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs) PR-2C-U Open Space C PR-2C-U Woods C PR-2C-U Gravel C PR-2C-U Impervious PR-2C-U

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Open Space C Hyd. No. 63 Hydrograph Type = NRCS Runoff Peak Flow = 2.230 cfs Storm Frequency = 25-yr Time to Peak = 12.22 hrs Time Interval = 1 min Runoff Volume = 9,495 cuft Drainage Area = 0.68 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 16.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.230 cfs 3 2 Q (cfs) 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Woods C Hyd. No. 64 Hydrograph Type = NRCS Runoff Peak Flow = 2.251 cfs Storm Frequency = 25-yr Time to Peak = 12.22 hrs Time Interval = 1 min Runoff Volume = 9,585 cuft Drainage Area = 0.77 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 16.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.251 cfs 3 2 Q (cfs) 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-U Gravel C Hyd. No. 65 Hydrograph Type = NRCS Runoff Peak Flow = 0.494 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 1,480 cuft Drainage Area = 0.08 ac Curve Number = 89.00 Tc Method = User Time of Conc. (Tc) = 2.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.494 cfs 0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 Q (cfs) 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hrs)