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

Hydrograph Report File: Eagle Rock Existing (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 TOTAL POA-1 Hyd. No. 18 Hydrograph Type = Junction Peak Flow = 13.48 cfs Storm Frequency = 2-yr Time to Peak = 12.12 hrs Time Interval = 1 min Hydrograph Volume = 52,703 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 13.48 cfs 15 14 13 12 11 10 9 8 Q (cfs) 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 (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 TOTAL POA-1 Hyd. No. 18 Hydrograph Type = Junction Peak Flow = 23.47 cfs Storm Frequency = 10-yr Time to Peak = 12.13 hrs Time Interval = 1 min Hydrograph Volume = 93,069 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 23.47 cfs 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-D EX-1-U TOTAL POA-1

Hydrograph Report File: Eagle Rock Existing (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 TOTAL POA-1 Hyd. No. 18 Hydrograph Type = Junction Peak Flow = 44.56 cfs Storm Frequency = 100-yr Time to Peak = 12.13 hrs Time Interval = 1 min Hydrograph Volume = 179,566 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 44.56 cfs 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-D EX-1-U TOTAL POA-1

TOTAL ALLOWABLE FLOW TO POA-1

Hydrograph Report File: Eagle Rock Existing (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 POA-1 2 yr Allow Hyd. No. 19 Hydrograph Type = Junction Peak Flow = 12.57 cfs Storm Frequency = 2-yr Time to Peak = 12.12 hrs Time Interval = 1 min Hydrograph Volume = 48,283 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 12.57 cfs 14 13 12 11 10 9 8 Q (cfs) 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 2 YR ALLOW EX-1-U POA-1 2 yr Allow

Hydrograph Report File: Eagle Rock Existing (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 POA-1 10 yr Allow Hyd. No. 20 Hydrograph Type = Junction Peak Flow = 22.52 cfs Storm Frequency = 10-yr Time to Peak = 12.12 hrs Time Interval = 1 min Hydrograph Volume = 88,648 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 22.52 cfs 25 24 23 22 21 20 19 18 17 16 15 14 13 Q (cfs) 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 10 YR ALLOW EX-1-U POA-1 10 yr Allow

Hydrograph Report File: Eagle Rock Existing (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 POA-1 100yr Allow Hyd. No. 21 Hydrograph Type = Junction Peak Flow = 42.92 cfs Storm Frequency = 100-yr Time to Peak = 12.13 hrs Time Interval = 1 min Hydrograph Volume = 172,115 cuft Inflow Hydrographs Total Contrib. Area = 0.0 ac Qp = 42.92 cfs 48 46 44 42 40 38 36 34 32 30 28 26 Q (cfs) 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 100 YR ALLOW EX-1-U POA-1 100yr Allow

EX-2-DISTURBED WATERSHED

Project: Eagle Rock Avenue By: TEG Date: 10/20/2025 Location: West Orange, NJ Checked By: MJV Date Checked: 10/20/2025 Circle One: Present Developed Current Existing Watershed EX-2-D 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 1. Surface Description (NEH table 15-1) Smooth Surfaces 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 3.46 5. Land Slope, s ft/ft 0.056 0.8 6. Compute Tt 0.007 (nL) hr 0.013 + + Tt = 0.5 0.4 P2 s Sheet Flow Sub-Total 0.013 hours Shallow Concentrated Flow Segment ID 2 3 4 Grassed 7. Surface Description Woodlands Pavement Waterways 8. Flow Length, L ft 23 140 155 9. Watercourse Slope, s ft/ft

ft 23 140 155 9. Watercourse Slope, s ft/ft 0.039 0.147 0.014 10. Average Velocity, V (NEH table 15-3) ft/s 3.19 1.93 2.39 11. Compute Tt L hr 0.002 + 0.020 + 0.018 Tt = 3600 V Shallow Conc. Flow Sub-Total 0.040 hours Channel Flow Segment ID 5 6 12. Flow Length, L ft 191 125 2 13. Cross Sectional flow area, a ft 0.61 0.61 14. Wetted Perimeter, Pw ft 1.96 1.96 15. Hydraulic Radius, r r = a / Pw ft 0.31 0.31 16. Channel Slope, s ft/ft 0.014 0.009 17. Manning's Roughness Coeff., n 0.013 0.013 2/3 1/2 18. Velocity, V V = (1.49 r s ) / n ft/s 6.14 5.13 19. Compute Tt L hr 0.009 + 0.007 + Tt = 3600 V Channel Flow Sub-Total 0.015 hours Watershed or subarea Tc or Tt