2025 02 Drainage Statement Signed

transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Natural Resources Web Soil Survey 10/29/2021 Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Essex County, New Jersey Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Natural Resources Web Soil Survey 10/29/2021 Conservation Service National Cooperative Soil Survey Page 4 of 4

HYDROGRAPH SUMMARY REPORTS – EXISTING AND PROPOSED CONDITIONS 2-, 10- & 100-YR.

1S 2S 3S 4S Existing Impervious Existing Pervious Proposed Impervious Proposed Pervious 5L 6L Existing Total Proposed Total Subcat Reach Pond Link Routing Diagram for 2025-01 HydroCAD Prepared by Dynamic Engineering, Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC

2025-01 HydroCAD Table of Contents Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Pipe Listing (all nodes) 2-Year Event 7 Node Listing 8 Subcat 1S: Existing Impervious 11 Subcat 2S: Existing Pervious 13 Subcat 3S: Proposed Impervious 16 Subcat 4S: Proposed Pervious 19 Link 5L: Existing Total 21 Link 6L: Proposed Total 10-Year Event 23 Node Listing 24 Subcat 1S: Existing Impervious 27 Subcat 2S: Existing Pervious 29 Subcat 3S: Proposed Impervious 32 Subcat 4S: Proposed Pervious 35 Link 5L: Existing Total 37 Link 6L: Proposed Total 100-Year Event 39 Node Listing 40 Subcat 1S: Existing Impervious 43 Subcat 2S: Existing Pervious 45 Subcat 3S: Proposed Impervious 48 Subcat 4S: Proposed Pervious 51 Link 5L: Existing Total 53 Link 6L: Proposed Total

2025-01 HydroCAD Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 2 2025-01 HydroCAD Prepared by Dynamic Engineering HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Printed 2/21/2025 Rainfall Events Listing Event# Event Storm Type Curve Mode Duration BIB Depth AMC Name (hours) (inches) 1 2Year = NOAA24-hr D Defautt 24.00 1 344 2 2 10-Year NOAA24-hr D Defautt 24.00 1 522 2 3 100:Year NOAA 24-hr D Defautt 24.00 1 866 2 Area Listing (all nodes) Area CN Description (acres) (subeatchment-numbers) 0.118 61 >75% Grass cover, Good, HSG B (28, 4S) 0.413 74 >75% Grass cover, Good, HSG C (2S, 4S) 0.019 80 >75% Grass cover, Good, HSG D (48) 1.716 98 —_Unconnected pavement, HSG B (18, 38) 2.266 92 TOTALAREA Page 3

2025-01 HydroCAD 2025-01 HydroCAD Prepared by Dynamic Engineering Printed 2/21/2025 Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 4 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 5 Soil Listing (all nodes) Ground Covers (all nodes) Area Soil Subcatchment HSG-A -HSG-B-HSG-C_—-HSG:D-—Other Total Ground Subcatchment (acres) Group Numbers. (acres) (acres) (acres) (acres) (acres) _—(acres) Cover Numbers 0.000 HSGA 0.000 «0118 = 0.413 ~—«0.019 «0.000.551 75% Grass cover, Good 28, 4S 1.834 HSGB 1S, 2S, 38, 4S 0,000 1.716 0,000 0,000 0,000 1.716 Unconnected pavement 1S, 3S 0413 HSGC 28,48 0.000 © 1834 = 0.413 «0.019» 0.000 -2.266.- TOTAL AREA 0.019 HSGD 4s 0.000 Other 2.266 TOTAL AREA

2025-01 HydroCAD Prepared by Dynamic Engineering Printed 2/21/2025 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 2/21/2025 2025-01 HydroCAD Prepared by Dynamic Engineering HydroCAD® 10.20-6a sin 08640 © 2024 HydroCAD Software Solutions LLC Page 6 HydroCAD® 10.20-6a sin 08640 © 2024 HydroCAD Software Solutions LLC Page 7 Pipe Listing (all nodes) Time span=0.00-30,00 hrs, dt=0.05 hrs, 601 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Line#t Node Ininvert Outinvert Length Slope Width Diam/Height Inside-Fill Node Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Number (feet) (feet) (feet) (fut) (inches) (inches) (inches) Name Subcatchment1S: ExistingImpervious Runoff Area=38,060 sf 100.00% Impervious Runoff Depth=3.21" 1 1s 0.00 0.00 50.0 0.0370 0.010 0.0 40 0.0 Flow Length=267' Tc=4.3min CN=98 Runoff=2.93 cfs 0.233 af 2 18 0.00 0.00 21.0 0.1380 0.010 0.0 10.0 0.0 338 0.00 0.00 59.0 0.0252 0.011 0.0 120 00 Subcatchment2S: Existing Pervious Runoff Area=11,289 sf_0.00% Impervious Runoff Depth=0.97" 4 38 0.00 0.00 111.0 0.0300 0.011 0.0 12.0 0.0 Te=4.3 min CN=70 Runofi=0.29 cfs 0.021 af 3 3s deo ©0008 00200 OO] ry Subcatchment3S: ProposedImpervious Runoff Area=96670 st 100.00% Inpervous Runoff Dep=.21" Flow Length=370' To=4.4 min CN=98 Runoff=2.81 cfs 0.225 af 7 38 0.00 0.00 27.0 0.0300 0.011 0.0 15.0 00 8 4s 0.00 0.00 58.0 0.0252 0.011 0.0 12.0 00 Subcatchment4S: ProposedPervious _ Runoff Area=12,691 sf 0.00% Impervious Runoff Depth=1.08" 9 48 0.00 0.00 117.0 0.0300 0.011 0.0 12.0 0.0 Flow Length=370' To=4.4 min CN=72 Runoff=0.37 cfs 0.026 af 10 4s 0.00 0.00 48.0 0.0200 0.011 0.0 12.0 0.0 148 0.00 0.00 26.0 0.0200 0.011 0.0 12.0 0.0 Link SL: Existing Total 12 48 0.00 0.00 27.0 0.0300 0.011 0.0 15.0 0.9 Inflow=3.17 cfs 0.251 af Primary=3.17 cfs 0.251 af Link 6L: Proposed Total Total Runoff Area = 2.266 ac Runoff Volume = 0.506 af Average Runoff Depth = 2.68" 24.29% Pervious = 0.551 ac 75.71% Impervious = 1.716 ac

2025-01 HydroCAD NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 8 2025-01 HydroCAD Prepared by Dynamic Engineering HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC NOAA 24-hr D 2-Year Rainfall=3.44" Printed 2/21/2025 Page 9 Summary for Subcatchment 1S: Existing Impervious [49] Hint: To<2dt may require smaller dt [47] Hint: Peak is 616% of capacity of segment #4 Runoff = 2.93 cfs @ 12.10 hrs, Volume= Routed to Link SL : Existing Total 0.233 af, Depth= 3.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 38,060 98 Unconnected pavement, HSG B 38,060 100.00% Impervious Area 38,060 100.00% Unconnected Te Length Slope Velocity Capacity Description (min) (feet) (ft) _(flsec) (cfs) 3.0 27 0.0700 (0.15 Sheet Flow, Sheet Flow - AB Grass: Dense n= 0.240 P2= 3.35" Sheet Flow, Sheet Flow - BC ‘Smooth surfaces n= 0.011 P2=3.35" Shallow Concentrated Flow, SCF - CD Paved Kv= 20.3 fps 02 50 0.0370 5.45 0.48 Pipe Channel, Pipe Flow - DE 4.0" Round Area= 0.1 sf Perim= 1.0° r= 0.08" n= 0.010 PVC, smooth interior 0.0 21 0.1380 19.40 10.58 Pipe Channel, Pipe Flow - EF 10.0" Round Area= 0.5 sf Perim= 2.6" r= 0.21' N= 0.010 PVC, smooth interior 07 73 0.0410 1.76 04 96 0.0470 © 4.40 43 267 Total Subcatchment 1S: Existing Impervious Hydrograph || || NOAA 24-hr D 2-Year Rainfall=3.44 3 Flow Length=2 Tes O12 34 5 6 7 8 8 10 Mt) te 1 We 17 W019 20 21 22 20 24 25 26 27 28 20 20 Time (hours)

2025-01 HydroCAD NOAA 24-hr D 2-Year Rainfall=3.44" 2025-01 HydroCAD NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 2/21/2025 Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a_ sin 08640 © 2024 HydroCAD Software Solutions LLC Page 10 HydroCAD® 10.20-6a sin 08640 © 2024 HydroCAD Software Solutions LLC Page 11 Hydrograph for Subcatchment 1S: Existing Impervious Summary for Subcatchment 2S: Existing Pervious Time Precip. Excess Runoff | Time Precip. Excess Runoff [49] Hint: To<2dt may require smaller dt (hours) (inches) (inches) (cis) | (hours) (inches) (inches) cfs) 0.00 0.00 0.00 0.00 26.000 3440 3.21 0.00 Runoff == 0.29cfs@ 12.11 hrs, Volume= 0.021 af, Depth= 0.97" 0.80 0.02 0.00 0.00 | 26.50 344 3.24 0.00 Routed to Link SL : Existing Total 1.00 0.04 0.00 0.00 | 2700 344 3.21 0.00 ry nee oor | oec0 has St $80 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30,00 hrs, dt= 0.05 hrs 250 0.11 0.02 002 | 2850 344 3.21 0.00 NOAA 24-hr D 2-Year Rainfall=3.44" 300 013 0.03 002 | 2900 344 3.21 0.00 350 0.18 0.04 003 | 2950 344 3.21 0.00 Area(sf)_CN Description 400 0.18 0.06 0.03 | 30.00 344 3.21 0.00 3,045 61 _>75% Grass cover, Good, HSG B 33) Ooe 008 Os 8,244 74 >75% Grass cover, Good, HSG C Pn oa or O os 11,289 70 Weighted Average bop 028 da O04 11,289 100.00% Pervious Area 650 033 0.17 0.05 700 036 020 0.08 Te Length Slope Velocity Capacity Description 7.50 0.40 0.23 0.06 (min) (feet) _(fi/ft)_ (ft/sec) (cfs) 800 045 0.27, 0.07 43 Direct Entry, TC 850 049 0.31 0.08 900 055 0.36, 0.09 - Existi ; 950 061 042 on Subcatchment 2S: Existing Pervious 1000 0.68 0.49 0.13 Hydrograph 1050 0.77 0.87 0.16 = = 1100 089 «0.69 0.24 1150 109 0.88 0.39 1200 165 1.43 176 1250 235 212 0.55 13:00 255 2.32 0.29 1350 267 2.44 0.18 1400 276 «253 0.15 1450 283 2.60 0.12 1500 289 266 0.10 > 1550 295 2.71 0.09 3 1600 299 2.76 0.08 z 1650 304 2.81 0.07 z 1700 3.08 2.85 0.07 1750 3.11 2.88 0.06 1800 315 2.91 0.05 1850 318 © 2.94 0.05 4900 3.20 2.97 0.05 1950 3.23 3.00 0.05 20,00 326 3.03 0.05 2050 329 3.05 0.04 2100 331 3.08 0.04 iso 33330 004 CHET ESTES HHUHUE RTO DAN EDEN BH ewe 22:00 3363.12 0.04 2250 338 3.15 0.04 23:00 3403.17 0.04 2350 342 319 0.03 24.00 3.44 3.21 0.03 2450 3443.21 0.00 25.00 344 3.21 0.00 2550 344 3.21 0.00