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Studies APPLICANT 8/10/2021
NORTHWOOD CHURCH DRAINAGE STUDY March 29, 2021 SITE CHARACTERISTICS The subject property is identified on County Assessor's Maps as 17-03-25-11 Tax Lot 2300. It is located on the north side of Maroola Rd. The site is an open field and consists of about 8.2 acres. EXISTING HYDROLOGY The site is relatively flat and the site drain into the existing ditch along the west side of the properly. PROPOSED HYDROLOGY The proposed drainage system consists of piping the proposed impervious drainage to three detention ponds. See attached Hydrology Map. North Basin The north basin collects the drainage from the parking spaces and walks on the north side of the building and half the church building and pipes the runoff to the north detention pond. The detention pond was sized using the TR -55 unit hydrograph storage indication method. The proposed outlet will drain into the existing adjacent ditch. The total existing flow from the site is 1.56 c.f.s. The total proposed flow from the detention pond will be reduced to 1.29 c.f.s. South Basin The south basin collects the drainage from the parking spaces and walks on the south side of the building and hag the church building and pipes the runoff to the south detention pond. The detention pond was sized using the TR -55 unit hydrograph storage indication method. The proposed outlet will drain into the existing adjacent ditch. The total existing flow from the site is 0.80 c.f.s. The total proposed flow from the detention pond will be reduced to 0.76 c.f.s. West Basin The west basin collects the drainage from the parking spaces and walks on the west side of the site and the proposed school building and pipes the runoff to the west detention pond. The detention pond was sized using the TR -55 unit hydrograph storage indication method. The proposed outlet will drain into the existing adjacent ditch. The total existing flow from the site is 0.21 c.f.s. The total proposed flow from the detention pond will be reduced to 0.18 c.f.s. Attached are the following for each drainage basin: 1. Pre -Development 10 -year flow (TR -55) 2. Post -Development 10 -year flow (TR -55) 3. Routed Post -Development 10 -year Flow (TR -55) 4. Stage -Discharge Curve 5. Stage -Storage Curve 6. Hydrograph of 10 -year Pre -development 5 -year Post -Development and 10 -year Routed Storm CONCLUSION Based on my calculations and the proposed drainage system is sized properly and will provide the necessary flow control. NVY J. F P EXPIRES DEC. 31, 2021 tmp#1 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YEAR PRE -DEVELOPMENT N1 Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 3.7000 ac Peak Time ....................... 498.0000 min Peak Flow ....................... 1.5622 cfs Given Input Data Subarea D/S Subareas Area CN Description (ac) ------------------------------------------------ 3 3.7000 74 Support Data: Subarea Name: 3, Row: 1 To It Rainfall (min) (min) (in) --------------------------- 25.0000 0.0000 4.5000 Composite Runoff Curve Number Calculator Description Area (ac) Curve Number PARKING LOT 0.1800 98 GRASS 0.6200 69 Total Area -----> 0.8000 76 <----- Weighted CN Page 1 tmp#1 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YEAR POST -DEVELOPMENT N1 Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 3.7000 ac Peak Time ....................... 498.0000 min Peak Flow ....................... 2.3543 cfs Given Input Data Subarea D/S Subareas Area CN Description (ac) ------------------------------------------------ 3 3.7000 86 Support Data: Subarea Name: 3, Row: 1 To It Rainfall (min) (min) (in) --------------------------- 25.0000 0.0000 4.5000 Composite Runoff Curve Number Calculator Description Area (ac) Curve Number IMPERVIOUS 1.8000 98 PERVIOUS 1.9000 74 Total Area -----> 3.7000 86 <----- Weighted CN Page 1 tmp#1 Storage Indication Method Given Input Data: File ........... Description . ROUTED 10 YEAR POND NORTH Time increment . 10.0000 min Input Files: Pre-Dev Hydrograph curve .. C:\Drawings\NORTHWOOD\HD\10-yr pre dev nl.hdc Post-Dev Hydrograph curve C:\Drawings\NORTHWOOD\HD\10-yr post dev nl.hdc Stage -Storage curve ....... C:\Drawings\NORTHWOOD\HD\pond nl.ssc Stage -Discharge curve ..... C:\Drawings\NORTHWOOD\HD\pond nl.sdc Output Data Routed Peak Flow ......... Inflow 1.2060 cfs Routed Peak Time ......... H2 9.0000 min min Pre -Developed Peak Flow .. 1.5622 ft3 cfs Pre -Developed Peak Time .. 498.0000 min Post -Developed Peak Flow 2.3543 cfs cfs Post -Developed Peak Time 498.0000 134.0432 min Support Calculations Time Inflow (I1+I2)/2 H1 S1 -(01/2)T S2+(O2/2)T H2 Outflow min cfs ft3 ft ft3 ft3 ft cfs --------------------------------------------------------------------------------- 420.0000 0.4468 134.0432 0.0000 0.0000 134.0432 465.5521 0.0000 430.0000 0.4755 276.6789 465.5521 134.0432 410.7221 465.6597 0.0000 440.0000 0.5136 296.7281 465.6597 410.7221 707.4503 465.7750 0.0000 450.0000 0.5900 331.0982 465.7750 707.4503 1038.5484 465.9038 0.0000 460.0000 0.7504 402.1296 465.9038 1038.5484 1440.6781 466.0601 0.0000 470.0000 1.0368 536.1728 466.0601 1440.6781 1976.8509 466.2686 0.1976 480.0000 1.5982 790.5112 466.2686 1858.3195 2648.8307 466.5298 0.4797 490.0000 2.2054 1141.0858 466.5298 2361.0400 3502.1257 466.8616 0.7431 500.0000 2.3486 1366.2096 466.8616 3056.2533 4422.4629 467.2194 0.9474 510.0000 2.0794 1328.4026 467.2194 3854.0040 5182.4066 467.5149 1.0891 520.0000 1.6440 1117.0267 467.5149 4528.9294 5645.9561 467.6951 1.1663 530.0000 1.3605 901.3546 467.6951 4946.1497 5847.5044 467.7735 1.1981 540.0000 1.2030 769.0299 467.7735 5128.6486 5897.6785 467.7930 1.2060 550.0000 1.1170 695.9936 467.7930 5174.0987 5870.0923 467.7822 1.2016 560.0000 1.0311 644.4385 467.7822 5149.1098 5793.5483 467.7525 1.1896 570.0000 0.9452 592.8834 467.7525 5079.7727 5672.6561 467.7055 1.1707 580.0000 0.8707 544.7653 467.7055 4970.2627 5515.0281 467.6442 1.1445 590.0000 0.8192 506.9583 467.6442 4828.3072 5335.2655 467.5743 1.1146 600.0000 0.7905 482.8993 467.5743 4666.5109 5149.4101 467.5020 1.0836 610.0000 0.7714 468.5784 467.5020 4499.2307 4967.8091 467.4314 1.0508 620.0000 0.7504 456.5489 467.4314 4337.3127 4793.8616 467.3638 1.0193 630.0000 0.7218 441.6552 467.3638 4182.2625 4623.9176 467.2977 0.9884 640.0000 0.7017 427.0479 467.2977 4030.8593 4457.9072 467.2332 0.9546 650.0000 0.6946 418.8850 467.2332 3885.1203 4304.0053 467.1734 0.9233 660.0000 0.6874 414.5888 467.1734 3750.0112 4164.6000 467.1192 0.8950 670.0000 0.6702 407.2851 467.1192 3627.6286 4034.9137 467.0687 0.8668 680.0000 0.6530 396.9741 467.0687 3514.8075 3911.7816 467.0209 0.8392 690.0000 0.6358 386.6631 467.0209 3408.2870 3794.9501 466.9754 0.8129 700.0000 0.6187 376.3521 466.9754 3307.2171 3683.5692 466.9321 0.7878 710.0000 0.6015 366.0411 466.9321 3210.8625 3576.9036 466.8907 0.7629 720.0000 0.5843 355.7301 466.8907 3119.1596 3474.8896 466.8510 0.7359 730.0000 0.5786 348.8560 466.8510 3033.3411 3382.1971 466.8150 0.7114 740.0000 0.5728 345.4190 466.8150 2955.3642 3300.7832 466.7833 0.6898 Page 1 tmp#i 750.0000 0.5671 341.9820 466.7833 2886.8754 3228.8574 466.7553 0.6708 760.0000 0.5671 340.2635 466.7553 2826.3683 3166.6318 466.7312 0.6544 770.0000 0.5671 340.2635 466.7312 2774.0214 3114.2849 466.7108 0.6405 780.0000 0.5671 340.2635 466.7108 2729.9850 3070.2485 466.6937 0.6274 790.0000 0.5614 338.5450 466.6937 2693.7793 3032.3243 466.6789 0.6141 800.0000 0.5556 335.1080 466.6789 2663.8354 2998.9434 466.6660 0.6024 810.0000 0.5499 331.6710 466.6660 2637.4788 2969.1498 466.6544 0.5920 820.0000 0.5442 328.2340 466.6544 2613.9546 2942.1886 466.6439 0.5825 830.0000 0.5385 324.7970 466.6439 2592.6668 2917.4638 466.6343 0.5739 840.0000 0.5327 321.3600 466.6343 2573.1449 2894.5049 466.6254 0.5658 850.0000 0.5299 318.7822 466.6254 2555.0172 2873.7994 466.6173 0.5586 860.0000 0.5270 317.0637 466.6173 2538.6687 2855.7324 466.6103 0.5522 870.0000 0.5241 315.3452 466.6103 2524.4036 2839.7488 466.6041 0.5466 880.0000 0.5213 313.6267 466.6041 2511.7833 2825.4101 466.5985 0.5416 890.0000 0.5184 311.9082 466.5985 2500.4619 2812.3701 466.5934 0.5370 900.0000 0.5156 310.1897 466.5934 2490.1659 2800.3557 466.5888 0.5328 910.0000 0.5127 308.4712 466.5888 2480.6797 2789.1509 466.5844 0.5289 920.0000 0.5098 306.7527 466.5844 2471.8327 2778.5854 466.5803 0.5252 930.0000 0.5070 305.0342 466.5803 2463.4905 2768.5247 466.5764 0.5216 940.0000 0.5041 303.3157 466.5764 2455.5469 2758.8626 466.5726 0.5182 950.0000 0.5012 301.5972 466.5726 2447.9180 2749.5152 466.5690 0.5150 960.0000 0.4984 299.8787 466.5690 2440.5375 2740.4162 466.5654 0.5118 970.0000 0.4955 298.1602 466.5654 2433.3532 2731.5134 466.5620 0.5086 980.0000 0.4926 296.4417 466.5620 2426.3238 2722.7655 466.5586 0.5056 990.0000 0.4898 294.7232 466.5586 2419.4167 2714.1399 466.5552 0.5026 1000.0000 0.4869 293.0047 466.5552 2412.6062 2705.6109 466.5519 0.4996 1010.0000 0.4840 291.2862 466.5519 2405.8720 2697.1582 466.5486 0.4966 1020.0000 0.4812 289.5677 466.5486 2399.1979 2688.7656 466.5454 0.4937 1030.0000 0.4783 287.8492 466.5454 2392.5714 2680.4206 466.5421 0.4907 1040.0000 0.4755 286.1307 466.5421 2385.9824 2672.1131 466.5389 0.4878 1050.0000 0.4726 284.4122 466.5389 2379.4231 2663.8352 466.5357 0.4849 1060.0000 0.4697 282.6937 466.5357 2372.8871 2655.5808 466.5325 0.4820 1070.0000 0.4669 280.9752 466.5325 2366.3696 2647.3448 466.5293 0.4791 1080.0000 0.4640 279.2567 466.5293 2359.8667 2639.1234 466.5261 0.4762 1090.0000 0.4604 277.3234 466.5261 2353.3754 2630.6987 466.5228 0.4733 1100.0000 0.4568 275.1752 466.5228 2346.7235 2621.8987 466.5194 0.4702 1110.0000 0.4533 273.0271 466.5194 2339.7752 2612.8023 466.5158 0.4670 1120.0000 0.4497 270.8790 466.5158 2332.5930 2603.4720 466.5122 0.4637 1130.0000 0.4461 268.7309 466.5122 2325.2260 2593.9569 466.5085 0.4604 1140.0000 0.4425 266.5827 466.5085 2317.7132 2584.2959 466.5047 0.4570 1150.0000 0.4389 264.4346 466.5047 2310.0851 2574.5197 466.5009 0.4536 1160.0000 0.4354 262.2865 466.5009 2302.3662 2564.6526 466.4971 0.4496 1170.0000 0.4318 260.1383 466.4971 2294.9041 2555.0425 466.4934 0.4455 1180.0000 0.4282 257.9902 466.4934 2287.7416 2545.7318 466.4898 0.4415 1190.0000 0.4246 255.8421 466.4898 2280.8023 2536.6444 466.4862 0.4377 1200.0000 0.4210 253.6940 466.4862 2274.0294 2527.7233 466.4828 0.4339 1210.0000 0.4175 251.5458 466.4828 2267.3804 2518.9262 466.4793 0.4302 1220.0000 0.4139 249.3977 466.4793 2260.8239 2510.2216 466.4760 0.4265 1230.0000 0.4103 247.2496 466.4760 2254.3362 2501.5858 466.4726 0.4228 1240.0000 0.4067 245.1014 466.4726 2247.8999 2493.0013 466.4693 0.4192 1250.0000 0.4031 242.9533 466.4693 2241.5018 2484.4551 466.4659 0.4155 1260.0000 0.3996 240.8052 466.4659 2235.1323 2475.9375 466.4626 0.4119 1270.0000 0.3960 238.6571 466.4626 2228.7840 2467.4410 466.4593 0.4083 1280.0000 0.3924 236.5089 466.4593 2222.4515 2458.9605 466.4560 0.4047 1290.0000 0.3888 234.3608 466.4560 2216.1309 2450.4917 466.4527 0.4011 1300.0000 0.3852 232.2127 466.4527 2209.8190 2442.0317 466.4494 0.3975 1310.0000 0.3817 230.0645 466.4494 2203.5137 2433.5783 466.4462 0.3939 1320.0000 0.3781 227.9164 466.4462 2197.2133 2425.1297 466.4429 0.3904 1330.0000 0.0000 113.4212 466.4429 2190.9165 2304.3377 466.3959 0.3391 Page 2 Stage—Discharge Curve (NORTH) 0.77 111Kfil 0.001 11 465.50 466.30 467.10 467.90 468.70 469.50 Stage — ft Stage—Storage Curve (NORTH) 9712.32 7769.86 M 5827.39 E 0 � 3884.93 f[:LrA1sa 0.00 � 465.50 466.30 467.10 467.90 468.70 469.50 Stage — ft Multiple Hydrographs (NORTH) 10 -YEAR POST DEVELOPMENT 10 -YEAR PRE DEVELOPMENT O -YEAR ROUTED STORM 602.00 784.00 966.00 1148.00 1330.00 Time — min 2.35 1.88 N 1.41 U 0.94 0.47 0.00 420.00 Multiple Hydrographs (NORTH) 10 -YEAR POST DEVELOPMENT 10 -YEAR PRE DEVELOPMENT O -YEAR ROUTED STORM 602.00 784.00 966.00 1148.00 1330.00 Time — min tmp#1 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YEAR PRE -DEVELOPMENT S1 Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 1.9000 ac Peak Time ....................... 498.0000 min Peak Flow ....................... 0.8022 cfs Given Input Data Subarea D/S Subareas Area CN Description (ac) ------------------------------------------------ 3 1.9000 74 Support Data: Subarea Name: 3, Row: 1 To It Rainfall (min) (min) (in) --------------------------- 25.0000 0.0000 4.5000 Composite Runoff Curve Number Calculator Description Area (ac) Curve Number IMPERVIOUS 1.8000 98 PERVIOUS 0.1000 74 Total Area -----> 1.9000 97 <----- Weighted CN Page 1 tmp#1 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YEAR POST -DEVELOPMENT S1 Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 1.9000 ac Peak Time ....................... 498.0000 min Peak Flow ....................... 1.6753 cfs Given Input Data Subarea D/S Subareas Area CN Description (ac) ------------------------------------------------ 3 1.9000 97 Support Data: Subarea Name: 3, Row: 1 To It Rainfall (min) (min) (in) --------------------------- 25.0000 0.0000 4.5000 Composite Runoff Curve Number Calculator Description Area (ac) Curve Number IMPERVIOUS 1.8000 98 PERVIOUS 0.1000 74 Total Area -----> 1.9000 97 <----- Weighted CN Page 1 tmp#1 Storage Indication Method Given Input Data: File ........... Description . ROUTED 10 YEAR POND SOUTH Time increment . 10.0000 min Input Files: Inflow 0.7579 Pre-Dev Hydrograph curve .. C:\Drawings\NORTHWOOD\HD\10-yr H2 pre dev sl.hdc Post-Dev Hydrograph curve C:\Drawings\NORTHWOOD\HD\10-yr Pre -Developed Peak post dev sl.hdc Stage -Storage curve ....... C:\Drawings\NORTHWOOD\HD\pond cfs sl.ssc Stage -Discharge curve ..... C:\Drawings\NORTHWOOD\HD\pond sl.sdc Output Data Routed Peak Flow ......... Inflow 0.7579 cfs Routed Peak Time ......... H2 9.3333 min min Pre -Developed Peak Flow .. 0.8022 ft3 cfs Pre -Developed Peak Time .. 498.0000 min Post -Developed Peak Flow 1.6753 cfs cfs Post -Developed Peak Time 498.0000 95.3822 min Support Calculations Time Inflow (I1+I2)/2 H1 S1 -(01/2)T S2+(O2/2)T H2 Outflow min cfs ft3 ft ft3 ft3 ft cfs --------------------------------------------------------------------------------- 420.0000 0.3179 95.3822 0.0000 0.0000 95.3822 464.3366 0.0000 430.0000 0.3383 196.8786 464.3366 95.3822 292.2607 464.4120 0.0000 440.0000 0.3655 211.1451 464.4120 292.2607 503.4058 464.4930 0.0000 450.0000 0.4198 235.6021 464.4930 503.4058 739.0079 464.5833 0.0000 460.0000 0.5340 286.1465 464.5833 739.0079 1025.1544 464.6930 0.0000 470.0000 0.7378 381.5286 464.6930 1025.1544 1406.6830 464.8393 0.0000 480.0000 1.1372 562.5102 464.8393 1406.6830 1969.1932 465.0549 0.0141 490.0000 1.5693 811.9712 465.0549 1960.7601 2772.7313 465.3630 0.4550 500.0000 1.6712 972.1643 465.3630 2499.7431 3471.9074 465.6310 0.5900 510.0000 1.4796 945.2617 465.6310 3117.9050 4063.1667 465.8577 0.6673 520.0000 1.1699 794.8513 465.8577 3662.7672 4457.6185 466.0089 0.7144 530.0000 0.9681 641.3839 466.0089 4028.9626 4670.3464 466.0904 0.7398 540.0000 0.8560 547.2246 466.0904 4226.4517 4773.6763 466.1301 0.7522 550.0000 0.7949 495.2535 466.1301 4322.3796 4817.6331 466.1469 0.7574 560.0000 0.7337 458.5681 466.1469 4363.1875 4821.7556 466.1485 0.7579 570.0000 0.6726 421.8826 466.1485 4367.0147 4788.8974 466.1359 0.7540 580.0000 0.6196 387.6429 466.1359 4336.5103 4724.1532 466.1111 0.7462 590.0000 0.5829 360.7402 466.1111 4276.4040 4637.1442 466.0777 0.7359 600.0000 0.5625 343.6203 466.0777 4195.6280 4539.2483 466.0402 0.7242 610.0000 0.5489 333.4299 466.0402 4104.7448 4438.1747 466.0014 0.7121 620.0000 0.5340 324.8700 466.0014 4010.9116 4335.7816 465.9622 0.6999 630.0000 0.5136 314.2720 465.9622 3915.8534 4230.1254 465.9217 0.6873 640.0000 0.4993 303.8778 465.9217 3817.7658 4121.6436 465.8801 0.6743 650.0000 0.4942 298.0692 465.8801 3717.0552 4015.1244 465.8393 0.6616 660.0000 0.4891 295.0121 465.8393 3618.1664 3913.1785 465.8002 0.6494 670.0000 0.4769 289.8150 465.8002 3523.5234 3813.3385 465.7619 0.6375 680.0000 0.4647 282.4779 465.7619 3430.8354 3713.3133 465.7236 0.6256 690.0000 0.4525 275.1408 465.7236 3337.9755 3613.1164 465.6851 0.6136 700.0000 0.4402 267.8038 465.6851 3244.9561 3512.7599 465.6467 0.5973 710.0000 0.4280 260.4667 465.6467 3154.3919 3414.8586 465.6091 0.5798 720.0000 0.4158 253.1296 465.6091 3066.9525 3320.0821 465.5728 0.5630 730.0000 0.4117 248.2382 465.5728 2982.3040 3230.5422 465.5385 0.5464 740.0000 0.4076 245.7925 465.5385 2902.7205 3148.5130 465.5070 0.5300 Page 1 tmp#i 750.0000 0.4035 243.3468 465.5070 2830.5162 3073.8630 465.4784 0.5151 760.0000 0.4035 242.1239 465.4784 2764.8073 3006.9313 465.4528 0.5017 770.0000 0.4035 242.1239 465.4528 2705.8922 2948.0162 465.4302 0.4900 780.0000 0.4035 242.1239 465.4302 2654.0336 2896.1575 465.4103 0.4796 790.0000 0.3995 240.9011 465.4103 2608.3862 2849.2873 465.3923 0.4703 800.0000 0.3954 238.4554 465.3923 2567.1298 2805.5852 465.3756 0.4615 810.0000 0.3913 236.0097 465.3756 2528.6620 2764.6717 465.3599 0.4534 820.0000 0.3872 233.5640 465.3599 2492.6489 2726.2129 465.3451 0.4457 830.0000 0.3832 231.1183 465.3451 2458.7964 2689.9147 465.3312 0.4384 840.0000 0.3791 228.6726 465.3312 2426.8458 2655.5184 465.3180 0.4316 850.0000 0.3770 226.8383 465.3180 2396.5692 2623.4076 465.3057 0.4252 860.0000 0.3750 225.6155 465.3057 2368.3044 2593.9199 465.2944 0.4193 870.0000 0.3730 224.3926 465.2944 2342.3486 2566.7412 465.2840 0.4139 880.0000 0.3709 223.1698 465.2840 2318.4252 2541.5950 465.2744 0.4088 890.0000 0.3689 221.9469 465.2744 2296.2908 2518.2378 465.2654 0.4042 900.0000 0.3669 220.7241 465.2654 2275.7311 2496.4552 465.2571 0.3998 910.0000 0.3648 219.5013 465.2571 2256.5576 2476.0588 465.2492 0.3958 920.0000 0.3628 218.2784 465.2492 2238.6041 2456.8825 465.2419 0.3919 930.0000 0.3607 217.0556 465.2419 2221.7246 2438.7802 465.2349 0.3883 940.0000 0.3587 215.8327 465.2349 2205.7905 2421.6232 465.2284 0.3849 950.0000 0.3567 214.6099 465.2284 2190.6884 2405.2983 465.2221 0.3816 960.0000 0.3546 213.3870 465.2221 2176.3188 2389.7058 465.2161 0.3785 970.0000 0.3526 212.1642 465.2161 2162.5939 2374.7581 465.2104 0.3755 980.0000 0.3505 210.9413 465.2104 2149.4365 2360.3778 465.2049 0.3727 990.0000 0.3485 209.7185 465.2049 2136.7786 2346.4971 465.1996 0.3699 1000.0000 0.3465 208.4956 465.1996 2124.5604 2333.0560 465.1944 0.3672 1010.0000 0.3444 207.2728 465.1944 2112.7292 2320.0020 465.1894 0.3646 1020.0000 0.3424 206.0499 465.1894 2101.2387 2307.2887 465.1845 0.3621 1030.0000 0.3404 204.8271 465.1845 2090.0481 2294.8752 465.1798 0.3596 1040.0000 0.3383 203.6042 465.1798 2079.1214 2282.7257 465.1751 0.3572 1050.0000 0.3363 202.3814 465.1751 2068.4271 2270.8085 465.1705 0.3444 1060.0000 0.3342 201.1585 465.1705 2064.1766 2265.3352 465.1685 0.3384 1070.0000 0.3322 199.9357 465.1685 2062.3000 2262.2356 465.1673 0.3350 1080.0000 0.3302 198.7128 465.1673 2061.2372 2259.9500 465.1664 0.3325 1090.0000 0.3276 197.3371 465.1664 2060.4535 2257.7907 465.1656 0.3301 1100.0000 0.3251 195.8086 465.1656 2059.7131 2255.5217 465.1647 0.3276 1110.0000 0.3225 194.2800 465.1647 2058.9352 2253.2152 465.1638 0.3251 1120.0000 0.3200 192.7514 465.1638 2058.1443 2250.8957 465.1629 0.3226 1130.0000 0.3174 191.2229 465.1629 2057.3490 2248.5719 465.1620 0.3200 1140.0000 0.3149 189.6943 465.1620 2056.5522 2246.2466 465.1611 0.3175 1150.0000 0.3123 188.1658 465.1611 2055.7549 2243.9207 465.1602 0.3149 1160.0000 0.3098 186.6372 465.1602 2054.9575 2241.5947 465.1593 0.3124 1170.0000 0.3072 185.1086 465.1593 2054.1599 2239.2686 465.1585 0.3098 1180.0000 0.3047 183.5801 465.1585 2053.3624 2236.9424 465.1576 0.3073 1190.0000 0.3021 182.0515 465.1576 2052.5648 2234.6163 465.1567 0.3047 1200.0000 0.2996 180.5230 465.1567 2051.7672 2232.2902 465.1558 0.3022 1210.0000 0.2971 178.9944 465.1558 2050.9696 2229.9640 465.1549 0.2997 1220.0000 0.2945 177.4658 465.1549 2050.1721 2227.6379 465.1540 0.2971 1230.0000 0.2920 175.9373 465.1540 2049.3745 2225.3118 465.1531 0.2946 1240.0000 0.2894 174.4087 465.1531 2048.5769 2222.9856 465.1522 0.2920 1250.0000 0.2869 172.8802 465.1522 2047.7793 2220.6595 465.1513 0.2895 1260.0000 0.2843 171.3516 465.1513 2046.9818 2218.3334 465.1504 0.2869 1270.0000 0.2818 169.8230 465.1504 2046.1842 2216.0072 465.1495 0.2844 1280.0000 0.2792 168.2945 465.1495 2045.3866 2213.6811 465.1486 0.2818 1290.0000 0.2767 166.7659 465.1486 2044.5890 2211.3549 465.1478 0.2793 1300.0000 0.2741 165.2374 465.1478 2043.7915 2209.0288 465.1469 0.2767 1310.0000 0.2716 163.7088 465.1469 2042.9939 2206.7027 465.1460 0.2742 1320.0000 0.2690 162.1802 465.1460 2042.1963 2204.3765 465.1451 0.2716 1330.0000 0.0000 80.7080 465.1451 2041.3987 2122.1067 465.1135 0.1815 Page 2 0.24 0.00 464.80 Stage—Discharge Curve (SOUTH) Peak Flow 0.8022 cfs — Time 29880.0000 min 465.30 465.80 466.30 466.80 467.30 Stage — ft 1.20 0.96 i 0.72 m 0.48 ca 0.24 0.00 464.80 Stage—Discharge Curve (SOUTH) Peak Flow 0.8022 cfs — Time 29880.0000 min 465.30 465.80 466.30 466.80 467.30 Stage — ft Stage—Storage Curve (SOUTH) Peak Flow 0.8022 cfs — Time 29880.0000 min 7465.44 5972.35 i 4479.26 6 0 2986.18 1493.09 0.00 v I I I I I I I I I I I I I I I I I I 1 1 464.30 464.90 465.50 466.10 466.70 467.30 Stage — ft Multiple Hydrographs (SOUTH) Peak Flow 0.8022 cfs — Time 29880.0000 min 10 -YEAR POST DEVELOPMENT rcsiaea�aa:�a���m�m�,n YEAR ROUTED STORM 602.00 784.00 966.00 1148.00 1330.00 Time — min 1.68 1.34 1.01 i ti a 0 w 0.67 0.34 0.00 420.00 Multiple Hydrographs (SOUTH) Peak Flow 0.8022 cfs — Time 29880.0000 min 10 -YEAR POST DEVELOPMENT rcsiaea�aa:�a���m�m�,n YEAR ROUTED STORM 602.00 784.00 966.00 1148.00 1330.00 Time — min tmp#1 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YEAR PRE DEVELOPMENT W1 Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 0.5000 ac Peak Time ....................... 498.0000 min Peak Flow ....................... 0.2111 cfs Given Input Data: ------------------------------------------------------------------------------- Subarea D/S Subareas Area CN To It Rainfall Description (ac) (min) (min) (in) ------------------------------------------------------------------------------- 3 0.5000 74 25.0000 0.0000 4.5000 Support Data: Subarea Name: 3, Row: 1 Page 1 tmp#1 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YEAR POST DEVELOPMENT W1 Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 0.5000 ac Peak Time ....................... 498.0000 min Peak Flow ....................... 0.3991 cfs Given Input Data Subarea D/S Subareas Area CN Description (ac) ------------------------------------------------ 3 0.5000 93 Support Data: Subarea Name: 3, Row: 1 To It Rainfall (min) (min) (in) --------------------------- 25.0000 0.0000 4.5000 Composite Runoff Curve Number Calculator Description Area (ac) Curve Number IMPERVIOUS 0.4000 98 PERVIOUS 0.1000 74 Total Area -----> 0.5000 93 <----- Weighted CN Page 1 tmp#1 Storage Indication Method Given Input Data: File ........... Description . ROUTED 10 -YEAR POND WEST Time increment . 10.0000 min Input Files: Pre-Dev Hydrograph curve .. C:\Drawings\NORTHWOOD\HD\10-yr pre dev wl.hdc Post-Dev Hydrograph curve C:\Drawings\NORTHWOOD\HD\10-yr post dev wl.hdc Stage -Storage curve ....... C:\Drawings\NORTHWOOD\HD\pond wl.ssc Stage -Discharge curve ..... C:\Drawings\NORTHWOOD\HD\pond wl.sdc Output Data Routed Peak Flow ......... Inflow 0.1819 cfs Routed Peak Time ......... H2 9.3333 min min Pre -Developed Peak Flow .. 0.2111 ft3 cfs Pre -Developed Peak Time .. 498.0000 min Post -Developed Peak Flow 0.3991 cfs cfs Post -Developed Peak Time 498.0000 22.7247 min Support Calculations Time Inflow (I1+I2)/2 H1 S1 -(01/2)T S2+(O2/2)T H2 Outflow min cfs ft3 ft ft3 ft3 ft cfs --------------------------------------------------------------------------------- 420.0000 0.0757 22.7247 0.0000 0.0000 22.7247 464.7656 0.0000 430.0000 0.0806 46.9061 464.7656 22.7247 69.6307 464.7976 0.0000 440.0000 0.0871 50.3051 464.7976 69.6307 119.9358 464.8321 0.0000 450.0000 0.1000 56.1319 464.8321 119.9358 176.0677 464.8705 0.0000 460.0000 0.1272 68.1740 464.8705 176.0677 244.2417 464.9171 0.0000 470.0000 0.1758 90.8987 464.9171 244.2417 335.1405 464.9793 0.0000 480.0000 0.2709 134.0173 464.9793 335.1405 469.1578 465.0710 0.0000 490.0000 0.3739 193.4511 465.0710 469.1578 662.6089 465.2034 0.0000 500.0000 0.3982 231.6169 465.2034 662.6089 894.2258 465.3619 0.0000 510.0000 0.3525 225.2074 465.3619 894.2258 1119.4332 465.5160 0.0000 520.0000 0.2787 189.3723 465.5160 1119.4332 1308.8055 465.6456 0.0000 530.0000 0.2306 152.8089 465.6456 1308.8055 1461.6144 465.7502 0.0000 540.0000 0.2039 130.3756 465.7502 1461.6144 1591.9900 465.8394 0.1239 550.0000 0.1894 117.9935 465.8394 1517.6674 1635.6609 465.8693 0.1814 560.0000 0.1748 109.2533 465.8693 1526.8335 1636.0868 465.8695 0.1819 570.0000 0.1602 100.5130 465.8695 1526.9229 1627.4359 465.8636 0.1705 580.0000 0.1476 92.3554 465.8636 1525.1072 1617.4626 465.8568 0.1574 590.0000 0.1389 85.9459 465.8568 1523.0139 1608.9598 465.8510 0.1462 600.0000 0.1340 81.8671 465.8510 1521.2292 1603.0963 465.8470 0.1385 610.0000 0.1308 79.4393 465.8470 1519.9985 1599.4378 465.8445 0.1337 620.0000 0.1272 77.3999 465.8445 1519.2306 1596.6305 465.8425 0.1300 630.0000 0.1224 74.8749 465.8425 1518.6414 1593.5163 465.8404 0.1259 640.0000 0.1190 72.3985 465.8404 1517.9877 1590.3862 465.8383 0.1218 650.0000 0.1178 71.0146 465.8383 1517.3308 1588.3454 465.8369 0.1191 660.0000 0.1165 70.2863 465.8369 1516.9024 1587.1887 465.8361 0.1175 670.0000 0.1136 69.0481 465.8361 1516.6596 1585.7077 465.8351 0.1156 680.0000 0.1107 67.3000 465.8351 1516.3488 1583.6488 465.8337 0.1129 690.0000 0.1078 65.5520 465.8337 1515.9166 1581.4686 465.8322 0.1100 700.0000 0.1049 63.8039 465.8322 1515.4590 1579.2629 465.8307 0.1071 710.0000 0.1020 62.0559 465.8307 1514.9961 1577.0519 465.8291 0.1042 720.0000 0.0991 60.3078 465.8291 1514.5320 1574.8398 465.8276 0.1013 730.0000 0.0981 59.1424 465.8276 1514.0677 1573.2101 465.8265 0.0991 740.0000 0.0971 58.5597 465.8265 1513.7256 1572.2854 465.8259 0.0979 Page 1 tmp#i 750.0000 0.0961 57.9771 465.8259 1513.5316 1571.5086 465.8254 0.0969 760.0000 0.0961 57.6857 465.8254 1513.3685 1571.0542 465.8250 0.0963 770.0000 0.0961 57.6857 465.8250 1513.2731 1570.9589 465.8250 0.0962 780.0000 0.0961 57.6857 465.8250 1513.2531 1570.9388 465.8250 0.0961 790.0000 0.0952 57.3944 465.8250 1513.2489 1570.6433 465.8248 0.0958 800.0000 0.0942 56.8117 465.8248 1513.1869 1569.9986 465.8243 0.0949 810.0000 0.0932 56.2290 465.8243 1513.0516 1569.2806 465.8238 0.0940 820.0000 0.0923 55.6463 465.8238 1512.9009 1568.5472 465.8233 0.0930 830.0000 0.0913 55.0636 465.8233 1512.7469 1567.8106 465.8228 0.0920 840.0000 0.0903 54.4810 465.8228 1512.5923 1567.0733 465.8223 0.0911 850.0000 0.0898 54.0439 465.8223 1512.4376 1566.4815 465.8219 0.0903 860.0000 0.0893 53.7526 465.8219 1512.3134 1566.0660 465.8216 0.0897 870.0000 0.0889 53.4613 465.8216 1512.2261 1565.6874 465.8214 0.0892 880.0000 0.0884 53.1699 465.8214 1512.1467 1565.3166 465.8211 0.0887 890.0000 0.0879 52.8786 465.8211 1512.0689 1564.9474 465.8209 0.0883 900.0000 0.0874 52.5872 465.8209 1511.9914 1564.5786 465.8206 0.0878 910.0000 0.0869 52.2959 465.8206 1511.9140 1564.2099 465.8204 0.0873 920.0000 0.0864 52.0046 465.8204 1511.8366 1563.8411 465.8201 0.0868 930.0000 0.0859 51.7132 465.8201 1511.7592 1563.4724 465.8199 0.0863 940.0000 0.0855 51.4219 465.8199 1511.6818 1563.1036 465.8196 0.0858 950.0000 0.0850 51.1305 465.8196 1511.6044 1562.7349 465.8193 0.0853 960.0000 0.0845 50.8392 465.8193 1511.5270 1562.3662 465.8191 0.0849 970.0000 0.0840 50.5478 465.8191 1511.4496 1561.9974 465.8188 0.0844 980.0000 0.0835 50.2565 465.8188 1511.3722 1561.6287 465.8186 0.0839 990.0000 0.0830 49.9652 465.8186 1511.2948 1561.2600 465.8183 0.0834 1000.0000 0.0825 49.6738 465.8183 1511.2174 1560.8912 465.8181 0.0829 1010.0000 0.0821 49.3825 465.8181 1511.1400 1560.5225 465.8178 0.0824 1020.0000 0.0816 49.0911 465.8178 1511.0626 1560.1537 465.8176 0.0819 1030.0000 0.0811 48.7998 465.8176 1510.9852 1559.7850 465.8173 0.0815 1040.0000 0.0806 48.5084 465.8173 1510.9078 1559.4163 465.8171 0.0810 1050.0000 0.0801 48.2171 465.8171 1510.8304 1559.0475 465.8168 0.0805 1060.0000 0.0796 47.9258 465.8168 1510.7530 1558.6788 465.8166 0.0800 1070.0000 0.0791 47.6344 465.8166 1510.6756 1558.3101 465.8163 0.0795 1080.0000 0.0787 47.3431 465.8163 1510.5982 1557.9413 465.8161 0.0790 1090.0000 0.0781 47.0153 465.8161 1510.5209 1557.5362 465.8158 0.0785 1100.0000 0.0774 46.6511 465.8158 1510.4358 1557.0870 465.8155 0.0779 1110.0000 0.0768 46.2870 465.8155 1510.3415 1556.6285 465.8152 0.0773 1120.0000 0.0762 45.9228 465.8152 1510.2453 1556.1681 465.8149 0.0767 1130.0000 0.0756 45.5586 465.8149 1510.1487 1555.7073 465.8145 0.0761 1140.0000 0.0750 45.1944 465.8145 1510.0519 1555.2464 465.8142 0.0755 1150.0000 0.0744 44.8303 465.8142 1509.9552 1554.7855 465.8139 0.0749 1160.0000 0.0738 44.4661 465.8139 1509.8585 1554.3245 465.8136 0.0743 1170.0000 0.0732 44.1019 465.8136 1509.7617 1553.8636 465.8133 0.0737 1180.0000 0.0726 43.7377 465.8133 1509.6650 1553.4027 465.8130 0.0731 1190.0000 0.0720 43.3735 465.8130 1509.5682 1552.9418 465.8126 0.0725 1200.0000 0.0714 43.0094 465.8126 1509.4715 1552.4809 465.8123 0.0718 1210.0000 0.0708 42.6452 465.8123 1509.3747 1552.0199 465.8120 0.0712 1220.0000 0.0702 42.2810 465.8120 1509.2780 1551.5590 465.8117 0.0706 1230.0000 0.0696 41.9168 465.8117 1509.1813 1551.0981 465.8114 0.0700 1240.0000 0.0690 41.5527 465.8114 1509.0845 1550.6372 465.8111 0.0694 1250.0000 0.0683 41.1885 465.8111 1508.9878 1550.1763 465.8108 0.0688 1260.0000 0.0677 40.8243 465.8108 1508.8910 1549.7153 465.8104 0.0682 1270.0000 0.0671 40.4601 465.8104 1508.7943 1549.2544 465.8101 0.0676 1280.0000 0.0665 40.0959 465.8101 1508.6975 1548.7935 465.8098 0.0670 1290.0000 0.0659 39.7318 465.8098 1508.6008 1548.3326 465.8095 0.0664 1300.0000 0.0653 39.3676 465.8095 1508.5041 1547.8716 465.8092 0.0658 1310.0000 0.0647 39.0034 465.8092 1508.4073 1547.4107 465.8089 0.0652 1320.0000 0.0641 38.6392 465.8089 1508.3106 1546.9498 465.8085 0.0646 1330.0000 0.0000 19.2286 465.8085 1508.2138 1527.4424 465.7952 0.0389 Page 2 Stage—Discharge Curve (WEST) Peak Flow 0.3991 cfs — Time 29880.0000 min 0.90 0.72 0.54 0.00 465.25 465.95 466.65 467.35 468.05 468.75 Stage — ft Stage—Storage Curve (WEST) Peak Flow 0.3991 cfs — Time 29880.0000 min 5575.56 4460.44 3345.33 0 2230.22 0.00 464.75 465.55 466.35 467.15 467.95 468.75 Stage — ft Multiple Hydrographs (WEST) Peak Flow 0.3991 efs — Time 29880.0000 min YEAR POST DEVELOPMENT 10 -YEAR PRE DEVELOPMENT 602.00 784.00 966.00 1148.00 1330.00 Time — min 0.80 0.64 0.48 3 w 0.32 0.16 0.00 420.00 Multiple Hydrographs (WEST) Peak Flow 0.3991 efs — Time 29880.0000 min YEAR POST DEVELOPMENT 10 -YEAR PRE DEVELOPMENT 602.00 784.00 966.00 1148.00 1330.00 Time — min d , THEFRVREPUGR P EN CIVILGINMMNG T i 1 S t 11 i Hyon yWV NORTH OOCHURCH I II u�m �: � r I fi y �t IITT m -- --- �9 I d , THEFRVREPUGR P EN CIVILGINMMNG T i 1 S t 11 i Hyon yWV NORTH OOCHURCH �: fi y �t d , THEFRVREPUGR P EN CIVILGINMMNG T i 1 S t 11 i Hyon yWV NORTH OOCHURCH �: iri,i A E cs € 1 33§ gg Pg �$ • eE 1® 6 Hyon yWV NORTH OOCHURCH