2025 12 19 Stormwater Report Rev 1

33 Precipitation Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 4 DA-2 Impervious Storm Frequency = 100 yrs Time interval = 6 min Total precip. = 11.5200 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 - Baginski - Manor - West Orang Incremental Rainfall Precipitation Precip (in) Precip (in) Hyd. No. 4 : DA-2 Impervious - 100 Year 2.00 2.00 1.00 1.00 0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 Time (hrs) Custom Design Storm -- S:\Petry Engineering Cad Projects\2024\24-170 - Baginski - Manor - West Orange\Civil\Curre

34 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 5 <no description> Hydrograph type = Combine Peak discharge = 34.65 cfs Storm frequency = 100 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 167,205 cuft Inflow hyds. = 1, 2 Contrib. drain. area = 4.680 ac <no description> Q (cfs) Q (cfs) Hyd. No. 5 -- 100 Year 35.00 35.00 30.00 30.00 25.00 25.00 20.00 20.00 15.00 15.00 10.00 10.00 5.00 5.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 5 Hyd No. 1

Time (hrs) Hyd No. 5 Hyd No. 1 Hyd No. 2

35 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 6 <no description> Hydrograph type = Combine Peak discharge = 1.271 cfs Storm frequency = 100 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 5,815 cuft Inflow hyds. = 3, 4 Contrib. drain. area = 0.180 ac <no description> Q (cfs) Q (cfs) Hyd. No. 6 -- 100 Year 2.00 2.00 1.00 1.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 6 Hyd No. 3 Hyd No. 4

36 Hydraflow Rainfall Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period (Yrs) B D E (N/A) 1 0.0000 0.0000 0.0000 -------- 2 69.8703 13.1000 0.8658 -------- 3 0.0000 0.0000 0.0000 -------- 5 79.2597 14.6000 0.8369 -------- 10 88.2351 15.5000 0.8279 -------- 25 102.6072 16.5000 0.8217 -------- 50 114.8193 17.2000 0.8199 -------- 100 127.1596 17.8000 0.8186 -------- File name: SampleFHA.idf Intensity = B / (Tc + D)^E Return Intensity Values (in/hr) Period (Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 5.69 4.61 3.89 3.38 2.99 2.69 2.44 2.24 2.07 1.93 1.81 1.70 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 6.57 5.43 4.65 4.08 3.65 3.30 3.02 2.79 2.59 2.42 2.27 2.15 10 7.24 6.04 5.21 4.59 4.12 3.74 3.43 3.17 2.95 2.77 2.60 2.46 25 8.25 6.95 6.03 5.34

10 7.24 6.04 5.21 4.59 4.12 3.74 3.43 3.17 2.95 2.77 2.60 2.46 25 8.25 6.95 6.03 5.34 4.80 4.38 4.02 3.73 3.48 3.26 3.07 2.91 50 9.04 7.65 6.66 5.92 5.34 4.87 4.49 4.16 3.88 3.65 3.44 3.25 100 9.83 8.36 7.30 6.50 5.87 5.36 4.94 4.59 4.29 4.03 3.80 3.60 Tc = time in minutes. Values may exceed 60. Projects\2024\24-170 - Baginski - Manor - West Orange\Civil\Current\Stormwater\Essex County - Future Projected.pcp Rainfall Precipitation Table (in) Storm Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Custom 0.00 4.09 0.00 0.00 6.37 0.00 0.00 11.52

EXISTING VS. PROPOSED RUNOFF RATES oo ©

TABLE 7 DA-1 EXISTING VS. PROPOSED RUNOFF RATES - CURRENT ADJUSTED RAINFALL Existing Conditions Proposed Conditions Difference Time 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year (Min) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) 0 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 6 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 12 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 18 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 24 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 30 0.000 0.000 0.003 0.000 0.000 0.003 0.000 0.000 0.000 36 0.000 0.000 0.016 0.000 0.000 0.015 0.000 0.000 -0.001 42 0.000 0.000 0.037 0.000 0.000 0.034 0.000 0.000 -0.003 48 0.000 0.002 0.062 0.000 0.002 0.058 0.000 0.000 -0.004 54 0.000 0.008 0.087 0.000 0.007 0.081 0.000 -0.001 -0.006 60 0.000 0.017 0.109 0.000 0.015 0.102 0.000 -0.001 -0.008 66 0.000 0.027 0.130 0.000 0.025 0.121 0.000 -0.002 -0.009 72 0.002 0.037 0.148 0.002 0.034 0.138 0.000 -0.003 -0.010 78 0.005 0.047 0.165 0.005 0.043 0.154 0.000 -0.003 -0.011 84 0.010 0.056 0.181 0.009 0.052 0.168 -0.001 -0.004 -0.013 90 0.015 0.064 0.195 0.014 0.060 0.181 -0.001 -0.004 -0.014 96 0.020 0.073 0.208 0.018 0.068 0.194 -0.001 -0.005 -0.014 102 0.024 0.080 0.220 0.023 0.075 0.205 -0.002 -0.006 -0.015 108 0.029 0.088 0.232 0.027 0.082 0.216 -0.002 -0.006 -0.016 114 0.033 0.095 0.243 0.031 0.088 0.226 -0.002 -0.007 -0.017 120 0.037 0.102 0.253 0.035 0.095 0.236 -0.003 -0.007 -0.018 126 0.042

0.033 0.095 0.243 0.031 0.088 0.226 -0.002 -0.007 -0.017 120 0.037 0.102 0.253 0.035 0.095 0.236 -0.003 -0.007 -0.018 126 0.042 0.108 0.263 0.039 0.101 0.245 -0.003 -0.007 -0.018 132 0.046 0.115 0.272 0.042 0.107 0.253 -0.003 -0.008 -0.019 138 0.050 0.121 0.281 0.046 0.112 0.262 -0.003 -0.008 -0.019 144 0.053 0.126 0.289 0.050 0.118 0.269 -0.004 -0.009 -0.020 150 0.057 0.132 0.297 0.053 0.123 0.277 -0.004 -0.009 -0.021 156 0.061 0.137 0.305 0.056 0.128 0.283 -0.004 -0.010 -0.021 162 0.064 0.142 0.312 0.060 0.133 0.290 -0.004 -0.010 -0.022 168 0.068 0.148 0.319 0.063 0.137 0.297 -0.005 -0.010 -0.022 174 0.071 0.152 0.326 0.066 0.142 0.303 -0.005 -0.011 -0.023 180 0.074 0.157 0.332 0.069 0.146 0.309 -0.005 -0.011 -0.023 186 0.077 0.161 0.338 0.072 0.150 0.315 -0.005 -0.011 -0.023 192 0.081 0.166 0.345 0.075 0.155 0.321 -0.006 -0.012 -0.024 198 0.084 0.170 0.351 0.078 0.159 0.327 -0.006 -0.012 -0.024 204 0.087 0.175 0.357 0.081 0.163 0.332 -0.006 -0.012 -0.025 210 0.090 0.179 0.363 0.084 0.167 0.337 -0.006 -0.012 -0.025 216 0.093 0.183 0.368 0.086 0.170 0.343 -0.006 -0.013 -0.026 222 0.096 0.187 0.374 0.089 0.174 0.348 -0.007 -0.013 -0.026 228 0.098 0.191 0.379 0.092 0.178 0.352 -0.007 -0.013 -0.026 234 0.101 0.194 0.383 0.094 0.181 0.357 -0.007 -0.013 -0.027 240 0.104 0.198 0.389 0.097 0.184 0.362 -0.007 -0.014 -0.027 1 of 24

Existing Conditions Proposed Conditions Difference Time 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year (Min) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) 246 0.107 0.202 0.394 0.099 0.188 0.366 -0.007 -0.014 -0.027 252 0.109 0.205 0.399 0.102 0.191 0.371 -0.008 -0.014 -0.028 258 0.112 0.209 0.404 0.104 0.194 0.376 -0.008 -0.014 -0.028 264 0.114 0.212 0.410 0.106 0.197 0.382 -0.008 -0.015 -0.028 270 0.117 0.216 0.417 0.109 0.201 0.389 -0.008 -0.015 -0.028 276 0.119 0.219 0.423 0.111 0.204 0.395 -0.008 -0.015 -0.028 282 0.122 0.222 0.430 0.113 0.207 0.402 -0.008 -0.015 -0.028 288 0.124 0.225 0.436 0.115 0.209 0.408 -0.009 -0.016 -0.028 294 0.126 0.228 0.443 0.117 0.212 0.415 -0.009 -0.016 -0.028 300 0.129 0.231 0.449 0.120 0.215 0.422 -0.009 -0.016 -0.028 306 0.131 0.234 0.456 0.122 0.218 0.428 -0.009 -0.016 -0.028 312 0.133 0.237 0.462 0.124 0.221 0.434 -0.009 -0.016 -0.028 318 0.135 0.240 0.468 0.126 0.224 0.441 -0.009 -0.017 -0.027 324 0.137 0.243 0.475 0.128 0.226 0.447 -0.010 -0.017 -0.027 330 0.140 0.246 0.481 0.130 0.229 0.454 -0.010 -0.017 -0.027 336 0.142 0.249 0.487 0.132 0.232 0.460 -0.010 -0.017 -0.027 342 0.144 0.251 0.493 0.134 0.234 0.466 -0.010 -0.017 -0.027 348 0.146 0.254 0.499 0.136 0.237 0.472 -0.010 -0.018 -0.027 354 0.148 0.257 0.506 0.138 0.239 0.479 -0.010 -0.018 -0.027 360 0.150 0.260 0.512 0.140 0.242 0.485 -0.010 -0.018 -0.027 366 0.153 0.264 0.520 0.142 0.245 0.493 -0.011 -0.018