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-1A-D Imp Hyd. No. 2 Hydrograph Type = NRCS Runoff Peak Flow = 2.005 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 6,677 cuft Drainage Area = 0.32 ac Curve Number = 98.00 Tc Method = User Time of Conc. (Tc) = 2.0 min Total Rainfall = 6.37 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 2.005 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-1A-D Hyd. No. 3 Hydrograph Type = Junction Peak Flow = 3.391 cfs Storm Frequency = 10-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 11,485 cuft Inflow Hydrographs = 1, 2 Total Contrib. Area = 0.65 ac Qp = 3.391 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-1A-D Grass D PR-1A-D Imp PR-1A-D

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1A-D Grass D Hyd. No. 1 Hydrograph Type = NRCS Runoff Peak Flow = 1.994 cfs Storm Frequency = 25-yr Time to Peak = 12.13 hrs Time Interval = 1 min Runoff Volume = 6,712 cuft Drainage Area = 0.33 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 7.0 min Total Rainfall = 8.13 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 1.994 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-1A-D Imp Hyd. No. 2 Hydrograph Type = NRCS Runoff Peak Flow = 2.562 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 8,592 cuft Drainage Area = 0.32 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 = 2.562 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-1A-D Hyd. No. 3 Hydrograph Type = Junction Peak Flow = 4.475 cfs Storm Frequency = 25-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 15,305 cuft Inflow Hydrographs = 1, 2 Total Contrib. Area = 0.65 ac Qp = 4.475 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-1A-D Grass D PR-1A-D Imp PR-1A-D

Hydrograph Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 PR-1A-D Grass D Hyd. No. 1 Hydrograph Type = NRCS Runoff Peak Flow = 3.062 cfs Storm Frequency = 100-yr Time to Peak = 12.13 hrs Time Interval = 1 min Runoff Volume = 10,581 cuft Drainage Area = 0.33 ac Curve Number = 80.00 Tc Method = User Time of Conc. (Tc) = 7.0 min Total Rainfall = 11.60 in Design Storm = NOAA-D Storm Duration = 24 hrs Shape Factor = 484 Qp = 3.062 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-1A-D Imp Hyd. No. 2 Hydrograph Type = NRCS Runoff Peak Flow = 3.659 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Runoff Volume = 12,370 cuft Drainage Area = 0.32 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 = 3.659 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-1A-D Hyd. No. 3 Hydrograph Type = Junction Peak Flow = 6.611 cfs Storm Frequency = 100-yr Time to Peak = 12.10 hrs Time Interval = 1 min Hydrograph Volume = 22,951 cuft Inflow Hydrographs = 1, 2 Total Contrib. Area = 0.65 ac Qp = 6.611 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-1A-D Grass D PR-1A-D Imp PR-1A-D

PR-1A-UNDISTURBED WATERSHED

Project: Eagle Rock Avenue By: TEG Date: 10/21/2025 Location: West Orange, NJ Checked By: MJV Date Checked: 10/21/2025 Circle One: Present Developed Future Proposed Watershed PR-1A-U Impervious Circle One: Tc Tt through subarea Include a map, schematic, or description of flow segments. Sheet Flow (Applicable to Tc Only) Segment ID 1 Smooth Surfaces 1. Surface Description (NEH table 15-1) 2. Manning's Roughness Coeff., n (NEH table 15-1) 0.011 3. Flow Length, L (total L < 100 ft) ft 100 4. Two-year 24-hr rainfall, P2 in 4.08 5. Land Slope, s ft/ft 0.034 6. Compute Tt 0.007 (nL)0.8 hr 0.014 + + Tt = P20.5s0.4 Sheet Flow Sub-Total 0.014 hours Shallow Concentrated Flow Segment ID 2 Pavement 7. Surface Description 8. Flow Length, L ft 48 9. Watercourse Slope, s ft/ft 0.024 10. Average Velocity, V (NEH table 15-3) ft/s 3.16 11. Compute Tt L hr 0.004 + + Tt = 3600 V