Stormwater Report 1

1532 0.435814 0.804494 0.269758 0.432945 0.799146 0.268218 0.430441 0.794485 0.266105 0.427026 0.788155 0.26421 0.423967 0.782467 0.26232 0.420913 0.776779 0.260657 0.418216 0.771773 0.258657 0.414983 0.765766 0.256651 0.411736 0.759759 0.254871 0.408867 0.754412 0.253092 0.405989 0.749069 0.251539 0.403472 0.744396 0.24942 0.40004 0.73804 0.247522 0.396974 0.732354 0.245619 0.393915 0.726669 0.24361 0.390669 0.720645 0.241596 0.387425 0.71463 11 of 12 2-Year (CFS) -0.003 -0.003 -0.003 -0.003 -0.003 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 Difference 10-Year 100-Year (CFS) (CFS) -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.002 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001

Time (Min) 1278 1284 1290 1296 1302 1308 1314 1320 1326 1332 1338 1344 1350 1356 1362 1368 1374 1380 1386 1392 1398 1404 1410 1416 1422 1428 1434 1440 1446 1452 1458 Existing Conditions 2-Year 10-Year 100-Year (CFS) (CFS) (CFS) 0.241331 0.385802 0.710159 0.239533 0.382902 0.704808 0.237964 0.380377 0.700135 0.235813 0.376932 0.693753 0.233898 0.373851 0.688059 0.231979 0.370764 0.68237 0.230289 0.368048 0.677348 0.228596 0.365334 0.672322 0.226563 0.362064 0.66628 0.224533 0.358801 0.660234 0.222723 0.355891 0.654881 0.220569 0.35243 0.648497 0.218648 0.349354 0.642804 0.216725 0.346276 0.637114 0.215034 0.343554 0.632089 0.213335 0.340831 0.627067 0.211638 0.338102 0.622025 0.209596 0.334828 0.615988 0.207558 0.33156 0.609953 0.205752 0.328652 0.604577 0.203595 0.325195 0.59819 0.201662 0.322104 0.592505 0.199729 0.319014 0.586805 0.198026 0.316278 0.581763 0.196335 0.313552 0.576741 0.194289 0.31028 0.570691 0.192246 0.307004 0.564646 0.190771 0.304642 0.560275 0.151843 0.242482 0.445937 0.075809 0.121061 0.222634 0.025193 0.040234 0.073988 Proposed Conditions 2-Year 10-Year 100-Year (CFS) (CFS) (CFS) 0.23981 0.384536 0.709274 0.238027 0.381649 0.703932 0.23647 0.379135 0.699266 0.234336 0.375704 0.692895 0.232436 0.372635 0.68721 0.230532 0.369561 0.681531 0.228856 0.366856 0.676516 0.227175 0.364154 0.671498 0.225157 0.360897 0.665465 0.223143 0.357647 0.659429 0.221347 0.354748 0.654084 0.219208 0.351301 0.647709 0.217302 0.348236 0.642025 0.215393 0.345171 0.636343 0.213714 0.34246 0.631326 0.212028 0.339747 0.626312 0.210344 0.337029 0.621278 0.208317 0.333768 0.61525 0.206293 0.330512 0.609223 0.2045 0.327616 0.603855 0.202359 0.324171 0.597478 0.20044 0.321091 0.591801 0.19852 0.318014 0.586109 0.19683 0.315288 0.581075 0.19515 0.312572 0.576059 0.193119 0.309311 0.570018 0.19109 0.306047 0.563981 0.189626 0.303695 0.559616 0.150933 0.241729 0.445414 0.075354 0.120686 0.222373 0.025042 0.040109 0.073901 12 of 12 2-Year (CFS) -0.002 -0.002 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 0.000 0.000 Difference 10-Year

-0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 0.000 0.000 Difference 10-Year 100-Year (CFS) (CFS) -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 0.000 0.000 0.000 0.000

,@ o APPENDIX

Chapter 2 Estimating Runoff and Peak Part 650 Discharges Engineering Field Handbook NJ Supplement NEW JERSEY 24 HOUR RAINFALL FREQUENCY DATA Rainfall amounts in Inches County Tyear 2year Syear {Oyear 25 year SOyear 100year Atlantic 2.72 3.31 4.30 5.16 6.46 7.61 8.90 Bergen 2.75 3.34 427 5.07 6.28 7.32 8.47 Burlington 2.77 3.36 4.34 5.18 6.45 7.58 8.81 Camden 2.73 3.31 4.25 5.06 6.28 7.34 8.52 Cape May 2.67 3.25 4.22 5.07 6.34 7.47 8.73 Cumberland 2.69 3.27 425 5.09 6.37 7.49 8.78 Essex 2.85 3.44 4.40 5.22 6.44 7.49 8.66 Gloucester 274 3.29 4.24 5.05 6.29 7.36 8.55 Hudson 2.73 3.31 4.23 5.02 6.19 7.20 8.31 Hunterdon 2.80 3.38 4.26 5.00 6.09 7.02 8.03 Mercer 2.74 3.34 4.23 5.01 6.19 7.20 8.33 Middlesex 2.76 3.35 4.30 5.12 6.36 7.43 8.63 Monmouth 2.79 3.38 4.38 5.23 6.53 7.66 8.94 Mortis 2.94 3.54 4.47 5.24 6.37 7.32 8.35 Ocean 2.81 3.42 4.45 5.33 6.68 7.87 9,20 Passaic 2.87 3.47 4.42 5.23 6.43 747 8.62 Salem 2.69 3.26 4.20 §.00 6.22 7.28 8.45 Somerset 2.76 3.34 4.25 5.01 6.15 7.43 8.21 Sussex 2.68 3.22 4.02 4.70 5.72 6.60 7.58 Union 2.80 3.39 4.35 5.17 6.42 7.49 8.69 Warren 2.78 3.34 4.18 4.89 5.93 6.83 7.82 Notes: The average point rainfall amounts listed above were developed from data contained in NOAA Atlas [4 Volume 2. Point rainfall estimates for specific locations may be obtained from the Precipitation Frequency Data Server located at http://www.nws.noaa.zov/ohd/hdse/ For most hydrologic design procedures, the rainfall amounts listed above may be rounded to the nearest tenth of an inch. Page | of 2 August, 2012

Chapter 2 Estimating Runoff and Peak Part 650 Discharges Engineering Field Handbook NJ Supplement NEW JERSEY Rainfall Distribution Regions Regional Rainfall Distributions for use in EFH-2 and winTRSS For winTR20, use site specific rainfill distributions from NOAA Atlas 14 data Page 2 of 2 August, 2012

Chapter 2 Estimating Runoff Technical Retease 55 Urban Hydrology for Small Watersheds Table 2-2a Runoff curve numbers for urban areas / Curve numbers for a Cover description hydrologic soil group Average percent Cover type and hydrologic condition impervious area Y A B c D Fully developed urban areas (vegetation established) Open space (lawns, parks, golf courses, cemeteries, etc.) Poor condition (grass cover < 50%)..... 68 79 86 89 Fair condition (grass cover 50% to 75%) 49 69 8 84 Good condition (grass cover > 75%). 39 61 14 80 Impervious areas: Paved parking lots, roofs, driveways, etc. (excluding right-of-way) 98 98 98 98 Streets and roads: Paved; curbs and storm sewers (excluding right-of-way) . sesseeesees 98 98 98 98 Paved; open ditches (including right-of-way) 83 89 92 93 Gravel (including right-of-way) 76 85 89 OL Dirt (including right-of-way). 72 82 87 89 Western desert urban areas; Natural desert landscaping (pervious areas only) + . 63 WW 85 88 Artificial desert landscaping (impervious weed barrier, desert shrub with 1- to 2-inch sand or gravel mulch : and basin borders) ... 96 96 96 96 Urban districts: Coramercial and business .. 85 89 92 S4 95 Tadusttial .... 72 81 88 ot 93 Residential districts by average lot size: V8 acre or less (town houses) . 65 17 85 90 92 14 acre 38 61 75 83 87 1 acre 30 57 72 81 86 V2 acre 25 54 70 80 85 Jacre .. 20 51 68 79 84 2 acres. 12 46 65 7 82 Developing urban areas Newly graded areas (pervious areas only, no vegetation) ¥... 17 86 a1 o4 Idle lands (ON's are determined using cover types -_ similar to those in table 3-2c). } Average runoff condition, and I, = 0.28. 2 The average percent impervious area shown was used to develop the composite CN's. Other assumptions are as follows: impervious areas are directly connected to the drainage system, impervious areas have a CN of 98, and pervious areas are considered equivalent to open space in good hydrologic condition. CN's for other combinations of conditions may be computed using figure 2-3 or 2-4, 3 CN's shown are equivalent to those of pasture. Composite CN's may be computed for other combinations of open space cover type. | Composite GN’s for natural desert landscaping should be computed using figures 23 or 2-4 based on the impervious area percentage (CN = 98) and the pervious area CN. The pervious area CN's are assured equivalent ta desert shrub in poor

landscaping should be computed using figures 23 or 2-4 based on the impervious area percentage (CN = 98) and the pervious area CN. The pervious area CN's are assured equivalent ta desert shrub in poor hydrologic condition, 5 Composite CN's ta use for the design of temporary measures during grading and construction should be computed using figure 23 or 2-4 based on the degree of development (impervious area percentage) and the CN's for the newly graded pervious areas. (210-V-TR-5, Second Ed., June 1986)

Chapter 2 Estimating Runoff Technical Release 55 Urban Hydrology for Small Watersheds Table 2-2c — Runoff curve numbers for other agricultural lands Y Curve numbers for Cover description hydrologic sof group Hydrologic Cover type condition A B c D Pasture, grassland, or range—continuous Poor 68 79 86 a9 forage for grazing. ¥ Fair 49 69 2) 84 Good 39 61 4 80 Meadow—continuous grass, protected from - 30 58 1 B grazing and generally mowed for hay. Brush—brush-weed-grass mixture with brush Poor 48 67 7 83 the major element. ¥ Fair 35 56 70 7 Good 304 48 65 73 Woods—grass combination (orchard Poor 57 vid 82 86 or tree farm). 9 Fair 43 65 76 82 Good 32 58 72 9 Woods. ¥ Poor 45 66 7 Fair 36 60 3 9 Good 302 55 7 7 Farmsteads—buildings, lanes, driveways, —_ 59 14 82 86 and surrounding lots. erage runoff coruition, and I, = 02S. A 2 Poor: <50%6) ground cover or heavily grazed with no mulch. Fair: 50 to 75% ground cover and not heavily grazed. Good: > 75% ground cover and lightly or only occasionally grazed. > Poor. <50% ground cover. Fair: 50 to 76% ground cover. Good: >75% ground cover. 4 Actual curve number is tess than 30; use CN = 90 for runoff computations. 5 CW's shown were computed for areas with 50% woods and 50% grass (pasture) cover. Other combinations of conditions may be computed from the CN’s for woods and pasture. © Poor: Forest litter, small trees, and brush are destroyed by heavy grazing or regular burning. Fair: Woods are grazed but not bumed, and same forest litter covers the soil. Good: Woods are protected from grazing, and litter and brush adequately cover the soll. (210-V1-TR-5S, Second Ed, June 1986) a7

Table 10-4 Recommended Coefficient of Runoff Values NOTE: Values are based on NRCS (formerly SCS) definitions and are average values. Source: Technical Manual for Land Use Regulation Program, Bureau of Inland and Coastal Regulations, NJDEP Flood Hazard Area Permits, New Jersey Department of Environmentat Protection for Various Selected Land Uses Land Use Description Cultivated Land thout conservation treatment | 0.- a 0.670.681] 0.88 ith conservation treatment 0.27 [0.439] 0.67|] 0.67 Pasture or Range Land condition 0.38 [0.63]0.78] 0.84 Meadow condition 0. pag 0.53] 0.65 condition 0.43] 0.61 [Wood or Forest Land in stand, poor cover, no mulch 0.34]]0.59]) 0.70 0.45] 0.59 n Spaces, Lawns, Pari If Courses, Cometeries Condition Fass Cover on 75% or more o> 90.2570.52] 0.65 Fair Condition Fass Cover on 50% to 75% -- JO45170.639 0.74 Commercial and Busi 5% impervious 0.84 ]0.90/0.93) 0.96 jArea industrial Districts |z2% impervious 0.67 Jlo.81 Oss} 0.92 Residential erage % impervious JAverage Lot Size (acres) Vs 5s 0.59 10.76 10.86) 0.90 4 8 0.29 10,55 10.70} 0.80 1/3 0 vr 10.49 70.67) 0.78 2 5 sr FO4570.65] 0.76 L 0 w> $0.41 90.63] 0.74 ta Areas Ee lots, roofs, driveways, | 0.99 |lo.99]/0.99] 0.99 c. [Streets and Roads ed with curbs & storm 0.99 10.9990.99] 0.99 0.57 10.76 )0.84] 0.88 ravel 0.49 10.6970.80] 0.84 rt