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

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A-U Impervious Hyd. No. 41 Hydrograph Type = NRCS Runoff Peak Flow = 5.444 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 18,259 cuft Drainage Area = 0.68 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 2.0 min Total Rainfall = 8.13 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 5.444 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)

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A-U Hyd. No. 42 Hydrograph Type = Junction Peak Flow = 6.642 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 24,543 cuft Inflow Hydrographs = 39, 40, 41 Total Contrib. Area = 1.04 ac Qp = 6.642 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) PR-2A-U Open Space C PR-2A-U Woods C PR-2A-U Impervious PR-2A-U

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A-U Open Space C Hyd. No. 39 Hydrograph Type = NRCS Runoff Peak Flow = 1.297 cfs Storm Frequency = 100-yr Time to Peak = 12.20 hrs Time Interval = 1 min Runoff Volume = 5,384 cuft Drainage Area = 0.18 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 15.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.297 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A-U Woods C Hyd. No. 40 Hydrograph Type = NRCS Runoff Peak Flow = 1.222 cfs Storm Frequency = 100-yr Time to Peak = 12.20 hrs Time Interval = 1 min Runoff Volume = 5,018 cuft Drainage Area = 0.18 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 15.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.222 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A-U Impervious Hyd. No. 41 Hydrograph Type = NRCS Runoff Peak Flow = 7.775 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 26,285 cuft Drainage Area = 0.68 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 2.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 7.775 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A-U Hyd. No. 42 Hydrograph Type = Junction Peak Flow = 9.764 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 36,687 cuft Inflow Hydrographs = 39, 40, 41 Total Contrib. Area = 1.04 ac Qp = 9.764 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-2A-U Open Space C PR-2A-U Woods C PR-2A-U Impervious PR-2A-U

= = PR-2A WATERSHED (COMBINED PROPOSED FLOW TO SSBB-2)

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A Hyd. No. 45 Hydrograph Type = Junction Peak Flow = 6.730 cfs Storm Frequency = 2-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 22,691 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 6.730 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) PR-2A-D PR-2A-U PR-2A

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A Hyd. No. 45 Hydrograph Type = Junction Peak Flow = 11.54 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 39,594 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 11.54 cfs 13 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) PR-2A-D PR-2A-U PR-2A

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2A Hyd. No. 45 Hydrograph Type = Junction Peak Flow = 15.28 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 53,032 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 15.28 cfs 17 16 15 14 13 12 11 10 9 Q (cfs) 8 7 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) PR-2A-D PR-2A-U PR-2A