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-2B-U Impervious Hyd. No. 53 Hydrograph Type = NRCS Runoff Peak Flow = 0.240 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 806 cuft Drainage Area = 0.03 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 = 0.240 cfs 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 Q (cfs) 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 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-2B-U Hyd. No. 54 Hydrograph Type = Junction Peak Flow = 0.302 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 977 cuft Inflow Hydrographs = 52, 53 Total Contrib. Area = 0.04 ac Qp = 0.302 cfs 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 Q (cfs) 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) PR-2B-U Open Space C PR-2B-U Impervious PR-2B-U

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2B-U Open Space C Hyd. No. 52 Hydrograph Type = NRCS Runoff Peak Flow = 0.098 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 280 cuft Drainage Area = 0.01 ac Curve Number = 74.00 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 = 0.098 cfs 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 Q (cfs) 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 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-2B-U Impervious Hyd. No. 53 Hydrograph Type = NRCS Runoff Peak Flow = 0.343 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 1,160 cuft Drainage Area = 0.03 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 = 0.343 cfs 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 Q (cfs) 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 Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2B-U Hyd. No. 54 Hydrograph Type = Junction Peak Flow = 0.441 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 1,440 cuft Inflow Hydrographs = 52, 53 Total Contrib. Area = 0.04 ac Qp = 0.441 cfs 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 Q (cfs) 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) PR-2B-U Open Space C PR-2B-U Impervious PR-2B-U

= = PR-2B WATERSHED (COMBINED PROPOSED FLOW TO PAPS-1)

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2B Hyd. No. 56 Hydrograph Type = Junction Peak Flow = 1.700 cfs Storm Frequency = 2-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 5,520 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 1.700 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) PR-2B-D PR-2B-U PR-2B

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2B Hyd. No. 56 Hydrograph Type = Junction Peak Flow = 2.704 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 8,914 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 2.704 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-2B-D PR-2B-U PR-2B

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2B Hyd. No. 56 Hydrograph Type = Junction Peak Flow = 3.476 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 11,538 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 3.476 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-2B-D PR-2B-U PR-2B

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-2B Hyd. No. 56 Hydrograph Type = Junction Peak Flow = 4.996 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 16,729 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 4.996 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-2B-D PR-2B-U PR-2B