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-1A-U Open Space C Hyd. No. 5 Hydrograph Type = NRCS Runoff Peak Flow = 0.881 cfs Storm Frequency = 10-yr Time to Peak = 12.17 hrs Time Interval = 1 min Runoff Volume = 3,257 cuft Drainage Area = 0.33 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 11.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.881 cfs 1 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 Q (cfs) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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-1A-U Woods C Hyd. No. 6 Hydrograph Type = NRCS Runoff Peak Flow = 0.185 cfs Storm Frequency = 10-yr Time to Peak = 12.17 hrs Time Interval = 1 min Runoff Volume = 686 cuft Drainage Area = 0.08 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 11.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.185 cfs 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 Q (cfs) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 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-1A-U Imp Hyd. No. 7 Hydrograph Type = NRCS Runoff Peak Flow = 2.643 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 8,750 cuft Drainage Area = 0.5 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 = 2.643 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-1A-U Hyd. No. 8 Hydrograph Type = Junction Peak Flow = 3.532 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 12,694 cuft Inflow Hydrographs = 5, 6, 7 Total Contrib. Area = 0.91 ac Qp = 3.532 cfs 4 3 Q (cfs) 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-1A-U Open Space C PR-1A-U Woods C PR-1A-U Imp PR-1A-U

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1A-U Open Space C Hyd. No. 5 Hydrograph Type = NRCS Runoff Peak Flow = 1.250 cfs Storm Frequency = 25-yr Time to Peak = 12.17 hrs Time Interval = 1 min Runoff Volume = 4,632 cuft Drainage Area = 0.33 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 11.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.250 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-1A-U Woods C Hyd. No. 6 Hydrograph Type = NRCS Runoff Peak Flow = 0.271 cfs Storm Frequency = 25-yr Time to Peak = 12.17 hrs Time Interval = 1 min Runoff Volume = 1,001 cuft Drainage Area = 0.08 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 11.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.271 cfs 0.28 0.26 0.24 0.22 0.2 0.18 0.16 Q (cfs) 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-1A-U Imp Hyd. No. 7 Hydrograph Type = NRCS Runoff Peak Flow = 3.306 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 11,028 cuft Drainage Area = 0.5 ac Curve Number = 98.00 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 = 3.306 cfs 4 3 Q (cfs) 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)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1A-U Hyd. No. 8 Hydrograph Type = Junction Peak Flow = 4.592 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 16,661 cuft Inflow Hydrographs = 5, 6, 7 Total Contrib. Area = 0.91 ac Qp = 4.592 cfs 5 4 3 Q (cfs) 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-1A-U Open Space C PR-1A-U Woods C PR-1A-U Imp PR-1A-U

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1A-U Open Space C Hyd. No. 5 Hydrograph Type = NRCS Runoff Peak Flow = 1.966 cfs Storm Frequency = 100-yr Time to Peak = 12.17 hrs Time Interval = 1 min Runoff Volume = 7,374 cuft Drainage Area = 0.33 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 11.0 min Total Rainfall = 9.24 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.966 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-1A-U Woods C Hyd. No. 6 Hydrograph Type = NRCS Runoff Peak Flow = 0.441 cfs Storm Frequency = 100-yr Time to Peak = 12.17 hrs Time Interval = 1 min Runoff Volume = 1,640 cuft Drainage Area = 0.08 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 11.0 min Total Rainfall = 9.24 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.441 cfs 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 Q (cfs) 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)