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-1C-U Impervious Hyd. No. 29 Hydrograph Type = NRCS Runoff Peak Flow = 3.954 cfs Storm Frequency = 2-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 13,118 cuft Drainage Area = 1.12 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 4.0 min Total Rainfall = 3.46 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 3.954 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-1C-U Hyd. No. 30 Hydrograph Type = Junction Peak Flow = 4.735 cfs Storm Frequency = 2-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 16,331 cuft Inflow Hydrographs = 28, 29 Total Contrib. Area = 1.85 ac Qp = 4.735 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-1C-U Open Space C PR-1C-U Impervious PR-1C-U

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1C-U Open Space C Hyd. No. 28 Hydrograph Type = NRCS Runoff Peak Flow = 2.035 cfs Storm Frequency = 10-yr Time to Peak = 12.15 hrs Time Interval = 1 min Runoff Volume = 7,078 cuft Drainage Area = 0.73 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 10.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.035 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-1C-U Impervious Hyd. No. 29 Hydrograph Type = NRCS Runoff Peak Flow = 6.186 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 20,908 cuft Drainage Area = 1.12 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 4.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 6.186 cfs 7 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)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1C-U Hyd. No. 30 Hydrograph Type = Junction Peak Flow = 7.998 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 27,986 cuft Inflow Hydrographs = 28, 29 Total Contrib. Area = 1.85 ac Qp = 7.998 cfs 9 8 7 6 5 Q (cfs) 4 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-1C-U Open Space C PR-1C-U Impervious PR-1C-U

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1C-U Open Space C Hyd. No. 28 Hydrograph Type = NRCS Runoff Peak Flow = 2.887 cfs Storm Frequency = 25-yr Time to Peak = 12.15 hrs Time Interval = 1 min Runoff Volume = 10,067 cuft Drainage Area = 0.73 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 10.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.887 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-1C-U Impervious Hyd. No. 29 Hydrograph Type = NRCS Runoff Peak Flow = 7.739 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 26,350 cuft Drainage Area = 1.12 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 4.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 7.739 cfs 8 7 6 5 Q (cfs) 4 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)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1C-U Hyd. No. 30 Hydrograph Type = Junction Peak Flow = 10.33 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 36,417 cuft Inflow Hydrographs = 28, 29 Total Contrib. Area = 1.85 ac Qp = 10.33 cfs 11 10 9 8 7 6 Q (cfs) 5 4 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-1C-U Open Space C PR-1C-U Impervious PR-1C-U

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1C-U Open Space C Hyd. No. 28 Hydrograph Type = NRCS Runoff Peak Flow = 4.534 cfs Storm Frequency = 100-yr Time to Peak = 12.15 hrs Time Interval = 1 min Runoff Volume = 16,027 cuft Drainage Area = 0.73 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 10.0 min Total Rainfall = 9.24 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 4.534 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)

Hydrograph Report File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1C-U Impervious Hyd. No. 29 Hydrograph Type = NRCS Runoff Peak Flow = 10.66 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 36,588 cuft Drainage Area = 1.12 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 4.0 min Total Rainfall = 9.24 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 10.66 cfs 12 11 10 9 8 7 Q (cfs) 6 5 4 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)