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-D Hyd. No. 61 Hydrograph Type = Junction Peak Flow = 2.150 cfs Storm Frequency = 2-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 6,352 cuft Inflow Hydrographs = 59, 60 Total Contrib. Area = 0.87 ac Qp = 2.150 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-D Open Space D PR-2C-D Impervious PR-2C-D

Hydrograph Report File: Eagle Rock Proposed (Current).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 = 2.298 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 6,369 cuft Drainage Area = 0.58 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.298 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-D Impervious Hyd. No. 60 Hydrograph Type = NRCS Runoff Peak Flow = 1.533 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 5,075 cuft Drainage Area = 0.29 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 5.38 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.533 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-D Hyd. No. 61 Hydrograph Type = Junction Peak Flow = 3.831 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 11,445 cuft Inflow Hydrographs = 59, 60 Total Contrib. Area = 0.87 ac Qp = 3.831 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-2C-D Open Space D PR-2C-D Impervious PR-2C-D

Hydrograph Report File: Eagle Rock Proposed (Current).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 = 3.107 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 8,757 cuft Drainage Area = 0.58 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 3.107 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-2C-D Impervious Hyd. No. 60 Hydrograph Type = NRCS Runoff Peak Flow = 1.917 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 6,396 cuft Drainage Area = 0.29 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 6.72 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.917 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-D Hyd. No. 61 Hydrograph Type = Junction Peak Flow = 5.024 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 15,154 cuft Inflow Hydrographs = 59, 60 Total Contrib. Area = 0.87 ac Qp = 5.024 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-D Open Space D PR-2C-D Impervious PR-2C-D

Hydrograph Report File: Eagle Rock Proposed (Current).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 = 4.630 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 13,414 cuft Drainage Area = 0.58 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 9.24 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 4.630 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-2C-D Impervious Hyd. No. 60 Hydrograph Type = NRCS Runoff Peak Flow = 2.640 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 8,882 cuft Drainage Area = 0.29 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 3.0 min Total Rainfall = 9.24 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.640 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-D Hyd. No. 61 Hydrograph Type = Junction Peak Flow = 7.270 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 22,296 cuft Inflow Hydrographs = 59, 60 Total Contrib. Area = 0.87 ac Qp = 7.270 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) PR-2C-D Open Space D PR-2C-D Impervious PR-2C-D