12 2026 02 12 Crestmont CC Stormwater Management Report

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-1-U Impervious Hyd. No. 15 Hydrograph Type = NRCS Runoff Peak Flow = 18.39 cfs Storm Frequency = 10-yr Time to Peak = 12.12 hrs Time Interval = 1 min Runoff Volume = 67,481 cuft Drainage Area = 2.94 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 = 18.39 cfs 21 20 19 18 17 16 15 14 13 12 11 Q (cfs) 10 9 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)

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-1-U Hyd. No. 16 Hydrograph Type = Junction Peak Flow = 23.98 cfs Storm Frequency = 10-yr Time to Peak = 12.12 hrs Time Interval = 1 min Hydrograph Volume = 92,240 cuft Inflow Hydrographs = 13, 14, 15 Total Contrib. Area = 5.0 ac Qp = 23.98 cfs 27 26 25 24 23 22 21 20 19 18 17 16 15 14 Q (cfs) 13 12 11 10 9 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) EX-1-U Open Space C EX-1-U Woods C EX-1-U Impervious EX-1-U

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-1-U Open Space C Hyd. No. 13 Hydrograph Type = NRCS Runoff Peak Flow = 10.14 cfs Storm Frequency = 100-yr Time to Peak = 12.18 hrs Time Interval = 1 min Runoff Volume = 40,046 cuft Drainage Area = 1.36 ac Curve Number = 74.00 Tc Method = User Time of Conc. (Tc) = 12.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 10.14 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)

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 EX-1-U Woods C Hyd. No. 14 Hydrograph Type = NRCS Runoff Peak Flow = 4.921 cfs Storm Frequency = 100-yr Time to Peak = 12.18 hrs Time Interval = 1 min Runoff Volume = 19,208 cuft Drainage Area = 0.7 ac Curve Number = 70.00 Tc Method = User Time of Conc. (Tc) = 12.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 4.921 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-1-U Impervious Hyd. No. 15 Hydrograph Type = NRCS Runoff Peak Flow = 33.57 cfs Storm Frequency = 100-yr Time to Peak = 12.12 hrs Time Interval = 1 min Runoff Volume = 125,010 cuft Drainage Area = 2.94 ac Curve Number = 98.00 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 = 33.57 cfs 38 36 34 32 30 28 26 24 22 20 Q (cfs) 18 16 14 12 10 8 6 4 2 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-1-U Hyd. No. 16 Hydrograph Type = Junction Peak Flow = 46.96 cfs Storm Frequency = 100-yr Time to Peak = 12.12 hrs Time Interval = 1 min Hydrograph Volume = 184,264 cuft Inflow Hydrographs = 13, 14, 15 Total Contrib. Area = 5.0 ac Qp = 46.96 cfs 54 52 50 48 46 44 42 40 38 36 34 32 30 28 Q (cfs) 26 24 22 20 18 16 14 12 10 8 6 4 2 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-1-U Open Space C EX-1-U Woods C EX-1-U Impervious EX-1-U

TOTAL EXISTING FLOW TO POA-1

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 TOTAL POA-1 Hyd. No. 18 Hydrograph Type = Junction Peak Flow = 16.83 cfs Storm Frequency = 2-yr Time to Peak = 12.12 hrs Time Interval = 1 min Hydrograph Volume = 65,237 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 16.83 cfs 19 18 17 16 15 14 13 12 11 10 Q (cfs) 9 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) EX-1-D EX-1-U TOTAL POA-1

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 TOTAL POA-1 Hyd. No. 18 Hydrograph Type = Junction Peak Flow = 29.21 cfs Storm Frequency = 10-yr Time to Peak = 12.13 hrs Time Interval = 1 min Hydrograph Volume = 114,471 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 29.21 cfs 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Q (cfs) 16 15 14 13 12 11 10 9 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) EX-1-D EX-1-U TOTAL POA-1

Hydrograph Report File: Eagle Rock Existing (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 TOTAL POA-1 Hyd. No. 18 Hydrograph Type = Junction Peak Flow = 58.39 cfs Storm Frequency = 100-yr Time to Peak = 12.13 hrs Time Interval = 1 min Hydrograph Volume = 233,251 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 58.39 cfs 66 64 62 60 58 56 54 52 50 48 46 44 42 40 38 36 Q (cfs) 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 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-1-D EX-1-U TOTAL POA-1