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-2C-D Open Space D Hyd. No. 59 Hydrograph Type = NRCS Runoff Peak Flow = 2.895 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 8,126 cuft Drainage Area = 0.58 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 6.37 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.895 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-D Impervious Hyd. No. 60 Hydrograph Type = NRCS Runoff Peak Flow = 1.817 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 6,051 cuft Drainage Area = 0.29 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 6.37 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.817 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-2C-D Hyd. No. 61 Hydrograph Type = Junction Peak Flow = 4.712 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 14,177 cuft Inflow Hydrographs = 59, 60 Total Contrib. Area = 0.87 ac Qp = 4.712 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-2C-D Open Space D PR-2C-D Impervious PR-2C-D

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-D Open Space D Hyd. No. 59 Hydrograph Type = NRCS Runoff Peak Flow = 3.960 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 11,343 cuft Drainage Area = 0.58 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 8.13 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 3.960 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-D Impervious Hyd. No. 60 Hydrograph Type = NRCS Runoff Peak Flow = 2.322 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 7,787 cuft Drainage Area = 0.29 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 8.13 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.322 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-D Hyd. No. 61 Hydrograph Type = Junction Peak Flow = 6.281 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 19,130 cuft Inflow Hydrographs = 59, 60 Total Contrib. Area = 0.87 ac Qp = 6.281 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-2C-D Open Space D PR-2C-D Impervious PR-2C-D

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-D Open Space D Hyd. No. 59 Hydrograph Type = NRCS Runoff Peak Flow = 6.049 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 17,882 cuft Drainage Area = 0.58 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 6.049 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-D Impervious Hyd. No. 60 Hydrograph Type = NRCS Runoff Peak Flow = 3.316 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 11,210 cuft Drainage Area = 0.29 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 3.316 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 (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2C-D Hyd. No. 61 Hydrograph Type = Junction Peak Flow = 9.365 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 29,092 cuft Inflow Hydrographs = 59, 60 Total Contrib. Area = 0.87 ac Qp = 9.365 cfs 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-2C-D Open Space D PR-2C-D Impervious PR-2C-D

PR-2C-UNDISTURBED WATERSHED