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

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Impervious Hyd. No. 41 Hydrograph Type = NRCS Runoff Peak Flow = 4.188 cfs Storm Frequency = 2-yr Time to Peak = 12.12 hrs Time Interval = 1 min Runoff Volume = 15,113 cuft Drainage Area = 1.05 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 5.0 min Total Rainfall = 4.08 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 4.188 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 Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Hyd. No. 42 Hydrograph Type = Junction Peak Flow = 6.021 cfs Storm Frequency = 2-yr Time to Peak = 12.12 hrs Time Interval = 1 min Hydrograph Volume = 25,806 cuft Inflow Hydrographs = 38, 39, 40, 41 Total Contrib. Area = 2.94 ac Qp = 6.021 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) EX-2-U Open Space C EX-2-U Woods C EX-2-U Gravel C EX-2-U Impervious EX-2-U

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Open Space C Hyd. No. 38 Hydrograph Type = NRCS Runoff Peak Flow = 2.460 cfs Storm Frequency = 10-yr Time to Peak = 12.23 hrs Time Interval = 1 min Runoff Volume = 10,797 cuft Drainage Area = 0.86 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 17.0 min Total Rainfall = 6.37 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.460 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 Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Woods C Hyd. No. 39 Hydrograph Type = NRCS Runoff Peak Flow = 2.405 cfs Storm Frequency = 10-yr Time to Peak = 12.23 hrs Time Interval = 1 min Runoff Volume = 10,574 cuft Drainage Area = 0.95 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 17.0 min Total Rainfall = 6.37 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.405 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 Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Gravel C Hyd. No. 40 Hydrograph Type = NRCS Runoff Peak Flow = 0.461 cfs Storm Frequency = 10-yr Time to Peak = 12.12 hrs Time Interval = 1 min Runoff Volume = 1,526 cuft Drainage Area = 0.08 ac Curve Number = 89.00 Tc Method = User Time of Conc. (Tc) = 5.0 min Total Rainfall = 6.37 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.461 cfs 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 Q (cfs) 0.24 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)

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Impervious Hyd. No. 41 Hydrograph Type = NRCS Runoff Peak Flow = 6.568 cfs Storm Frequency = 10-yr Time to Peak = 12.12 hrs Time Interval = 1 min Runoff Volume = 24,100 cuft Drainage Area = 1.05 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 5.0 min Total Rainfall = 6.37 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 6.568 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 Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Hyd. No. 42 Hydrograph Type = Junction Peak Flow = 10.74 cfs Storm Frequency = 10-yr Time to Peak = 12.13 hrs Time Interval = 1 min Hydrograph Volume = 46,998 cuft Inflow Hydrographs = 38, 39, 40, 41 Total Contrib. Area = 2.94 ac Qp = 10.74 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) EX-2-U Open Space C EX-2-U Woods C EX-2-U Gravel C EX-2-U Impervious EX-2-U

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Open Space C Hyd. No. 38 Hydrograph Type = NRCS Runoff Peak Flow = 5.666 cfs Storm Frequency = 100-yr Time to Peak = 12.23 hrs Time Interval = 1 min Runoff Volume = 25,433 cuft Drainage Area = 0.86 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 17.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 5.666 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 Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Woods C Hyd. No. 39 Hydrograph Type = NRCS Runoff Peak Flow = 5.895 cfs Storm Frequency = 100-yr Time to Peak = 12.23 hrs Time Interval = 1 min Runoff Volume = 26,181 cuft Drainage Area = 0.95 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 17.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 5.895 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 Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-2-U Gravel C Hyd. No. 40 Hydrograph Type = NRCS Runoff Peak Flow = 0.886 cfs Storm Frequency = 100-yr Time to Peak = 12.12 hrs Time Interval = 1 min Runoff Volume = 3,066 cuft Drainage Area = 0.08 ac Curve Number = 89.00 Tc Method = User Time of Conc. (Tc) = 5.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 0.886 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)