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HomeMy WebLinkAboutStudies APPLICANT 11/12/2020JASPER GARDENS DRAINAGE STUDY November 9, 2020 SITE CHARACTERISTICS The subject properly is identified on County Assessor's Maps as 18-02-05-24-6700 & 6800. It is located on the north side of Jasper Rd. east of 43rd Sl. and west of 440 St. The site is a operating nursey with two existing homes and consists of about 1.7 acres. EXISTING HYDROLOGY The site is relatively flat and portions of the site drain to the south. PROPOSED HYDROLOGY The proposed drainage system of piping the proposed drainage to a proposed detention pond on the east side of the subdivision on the north side of the proposed Kalmia Sl. The pond was sized using the TR -55 unit hydrograph storage indication method. The proposed detention pond has an overflow outlet at elevation 489.5. The proposed outlet will drain into an existing 10" storm drain in Kalmia St. The pre -development flow from the site is 0.55 c.f.s. The post -development flow to be directed to the detention pond is 0.85 c.f.s. The total proposed flow after routing through the proposed detention pond is 0.50 c.f.s. Attached are the following: 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 10 -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. ���yED PROFFS rr, I NES' Qv 4'8240 PE'p 9 7W\ EXPIRES DEC. 31. 2021 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YR PRE DEVELOPMENT Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 1.7000 ac Peak Time ....................... 504.0000 min Peak Flow ....................... 0.5533 cfs Given Input Data: ---------------------------- Subarea D/S Subareas Description --------------------------- 1 Support Data: ------------------------------------------------ Area CN Tc Tt Rainfall (ac) ------------------------------------------------ (min) (min) (in) 1.7000 69 30.0000 0.0000 4.5000 TR -55 Tabular Hydrograph Method Input Summary Description ..................... 10 -YR POST DEVELOPMENT Rainfall Distribution ........... Type IA Ia/P Interpolation .............. Off Total Area ...................... 1.7000 ac Peak Time ....................... 504.0000 min Peak Flow ....................... 0.8500 cfs Given Input Data: ---------------------------- Subarea D/S Subareas Description --------------------------- 1 Support Data: ------------------------------------------------ Area CN Tc Tt Rainfall (ac) ------------------------------------------------ (min) (min) (in) 1.7000 80 30.0000 0.0000 4.5000 tmpkl.txt Storage Indication Method Given Input Data: File ........... Description .... ROUTED 10 -YEAR STORM Time increment. 10.0000 min Input Files: Pre-Dev Hydrograph curve.. C:\DRAWINGS\MASTER\HD\pre-dev 10-yr.hdc Post-Dev Hydrograph curve. C:IDRAWINGSWIASTER\HD\post-dev 10-ychdc Stage -Storage curve....... C:\DRAWINGS\MASTER\HD\pond.ssc Stage -Discharge curve ..... C:\DRAW INGS\MASTER\HD\POND.sdc Output Data: Routed Peak Flow ......... 0.5025 cls Routed Peak Time ......... 9.5000 min Pre -Developed Peak Flow.. 0.5533 cls Pre -Developed Peak Time.. 504.0000 min Post -Developed Peak Flow. 0.8500 ds Post -Developed Peak Time. 504.0000 min Support Calculations: Time Inflow (11+12)/2 H1 Sl-(O12)T S2+(O2/2)T H2 Outflow min ds (l3 fl fl3 fl3 fl ds ---------------------------------------------------------------------------------- 420.0000 0.1635 49.0385 0.0000 0.0000 49.0385 487.5387 0.0000 430.0000 0.1744 101.3462 487.5387 44.7808 146.1269 487.6153 0.0000 440.0000 0.1874 108.5385 487.6153 133.4398 241.9782 487.6910 0.0000 450.0000 0.2092 119.0000 487.6910 220.9689 339.9689 487.7683 0.0000 460.0000 0.2499 137.7436 487.7683 310.4518 448.1954 487.8538 0.0000 470.0000 0.3189 170.6538 487.8538 409.2816 579.9355 487.9577 0.0000 480.0000 0.4708 236.9103 487.9577 529.5837 766.4940 488.1050 0.0044 490.0000 0.7062 353.0769 488.1050 699.9446 1053.0215 488.3312 0.1750 500.0000 0.8456 465.5385 488.3312 961.5949 1427.1334 488.6264 0.2924 510.0000 0.8435 506.7308 488.6264 1303.2253 1809.9560 488.9286 0.3762 520.0000 0.7083 465.5385 488.9286 1652.8101 2118.3485 489.1720 0.4315 530.0000 0.5841 387.7308 489.1720 1934.4270 2322.1577 489.3329 0.4647 540.0000 0.4969 324.3077 489.3329 2120.5408 2444.8485 489.4297 0.4835 550.0000 0.4533 285.0769 489.4297 2232.5792 2517.6561 489.4872 0.4942 560.0000 0.4141 260.2308 489.4872 2299.0655 2559.2962 489.5201 0.5002 570.0000 0.3792 238.0000 489.5201 2337.0902 2575.0902 489.5325 0.5025 580.0000 0.3487 218.3846 489.5325 2351.5129 2569.8975 489.5284 0.5018 590.0000 0.3237 201.7115 489.5284 2346.7711 2548.4826 489.5115 0.4987 600.0000 0.3073 189.2885 489.5115 2327.2155 2516.5040 489.4863 0.4940 610.0000 0.2964 181.1154 489.4863 2298.0133 2479.1287 489.4568 0.4886 620.0000 0.2862 174.7949 489.4568 2263.8831 2438.6780 489.4249 0.4825 630.0000 0.2790 169.5641 489.4249 2226.9444 2396.5085 489.3916 0.4761 640.0000 0.2724 165.4231 489.3916 2188.4362 2353.8593 489.3579 0.4696 650.0000 0.2670 161.8269 489.3579 2149.4900 2311.3169 489.3243 0.4631 660.0000 0.2615 158.5577 489.3243 2110.6412 2269.1989 489.2911 0.4565 670.0000 0.2572 155.6154 489.2911 2072.1801 2227.7955 489.2584 0.4496 680.0000 0.2528 153.0000 489.2584 2034.3714 2187.3714 489.2265 0.4429 690.0000 0.2485 150.3846 489.2265 1997.4570 2147.8416 489.1953 0.4364 Page 1 tmp#l.txt 700.0000 0.2397 146.4615 489.1953 1961.3594 2107.8209 489.1637 0.4298 710.0000 0.2310 141.2308 489.1637 1924.8134 2066.0442 489.1307 0.4226 720.0000 0.2223 136.0000 489.1307 1886.6638 2022.6638 489.0965 0.4151 730.0000 0.2201 132.7308 489.0965 1847.0499 1979.7807 489.0626 0.4076 740.0000 0.2179 131.4231489.0626 1807.8900 1939.3131489.0307 0.4005 750.0000 0.2158 130.1154 489.0307 1770.9359 1901.0513 489.0005 0.3938 760.0000 0.2158 129.4615 489.0005 1735.9962 1865.4577 488.9724 0.3870 770.0000 0.2158 129.4615 488.9724 1703.4929 1832.9545 488.9468 0.3807 780.0000 0.2158 129.4615 488.9468 1673.8117 1803.2732 488.9233 0.3749 790.0000 0.2136 128.8077 488.9233 1646.7075 1775.5152 488.9014 0.3696 800.0000 0.2114 127.5000 488.9014 1621.3595 1748.8595 488.8804 0.3644 810.0000 0.2092 126.1923 488.8804 1597.0181 1723.2104 488.8601 0.3594 820.0000 0.2071 124.8846 488.8601 1573.5959 1698.4806 488.8406 0.3544 830.0000 0.2049 123.5769 488.8406 1551.0132 1674.5902 488.8218 0.3492 840.0000 0.2027 122.2692 488.8218 1529.1971 1651.4663 488.8035 0.3442 850.0000 0.2016 121.2885 488.8035 1508.0809 1629.3694 488.7861 0.3393 860.0000 0.2005 120.6346 488.7861 1487.9025 1608.5371 488.7696 0.3348 870.0000 0.1994 119.9808 488.7696 1468.8789 1588.8597 488.7541 0.3305 880.0000 0.1983 119.3269 488.7541 1450.9100 1570.2369 488.7394 0.3265 890.0000 0.1972 118.6731 488.7394 1433.9041 1552.5772 488.7255 0.3226 900.0000 0.1962 118.0192 488.7255 1417.7776 1535.7969 488.7122 0.3190 910.0000 0.1951 117.3654 488.7122 1402.4542 1519.8196 488.6996 0.3155 920.0000 0.1940 116.7115 488.6996 1387.8642 1504.5757 488.6876 0.3117 930.0000 0.1929 116.0577 488.6876 1373.9438 1490.0015 488.6761 0.3081 940.0000 0.1918 115.4038 488.6761 1360.6350 1476.0388 488.6650 0.3046 950.0000 0.1907 114.7500 488.6650 1347.8846 1462.6346 488.6545 0.3013 960.0000 0.1896 114.0962 488.6545 1335.6441 1449.7403 488.6443 0.2981 970.0000 0.1885 113.4423 488.6443 1323.8693 1437.3117 488.6345 0.2950 980.0000 0.1874 112.7885 488.6345 1312.5198 1425.3083 488.6250 0.2920 990.0000 0.1863 112.1346 488.6250 1301.5586 1413.6932 488.6158 0.2891 1000.0000 0.1853 111.4808 488.6158 1290.9520 1402.4328 488.6069 0.2863 1010.0000 0.1842 110.8269 488.6069 1280.6692 1391.4962 488.5983 0.2836 1020.0000 0.1831 110.1731 488.5983 1270.6822 1380.8552 488.5899 0.2809 1030.0000 0.1820 109.5192 488.5899 1260.9651 1370.4843 488.5817 0.2783 1040.0000 0.1809 108.8654 488.5817 1251.4947 1360.3600 488.5737 0.2758 1050.0000 0.1798 108.2115 488.5737 1242.2494 1350.4609 488.5659 0.2734 1060.0000 0.1787 107.5577 488.5659 1233.2097 1340.7674 488.5583 0.2709 1070.0000 0.1776 106.9038 488.5583 1224.3579 1331.2617 488.5508 0.2686 1080.0000 0.1765 106.2500 488.5508 1215.6774 1321.9274 488.5434 0.2658 1090.0000 0.1752 105.5144 488.5434 1207.1536 1312.6680 488.5361 0.2630 1100.0000 0.1738 104.6971 488.5361 1198.6982 1303.3953 488.5288 0.2602 1110.0000 0.1725 103.8798 488.5288 1190.2305 1294.1103 488.5214 0.2574 1120.0000 0.1711 103.0625 488.5214 1181.7516 1284.8141 488.5141 0.2546 1130.0000 0.1697 102.2452 488.5141 1173.2626 1275.5078 488.5068 0.2518 1140.0000 0.1684 101.4279 488.5068 1164.7643 1266.1921 488.4994 0.2490 1150.0000 0.1670 100.6106 488.4994 1156.2574 1256.8680 488.4920 0.2462 1160.0000 0.1656 99.7933 488.4920 1147.7428 1247.5361 488.4847 0.2434 1170.0000 0.1643 98.9760 488.4847 1139.2212 1238.1971 488.4773 0.2406 1180.0000 0.1629 98.1587 488.4773 1130.6930 1228.8517 488.4699 0.2378 1190.0000 0.1616 97.3413 488.4699 1122.1590 1219.5003 488.4626 0.2350 1200.0000 0.1602 96.5240 488.4626 1113.6195 1210.1436 488.4552 0.2322 1210.0000 0.1588 95.7067 488.4552 1105.0752 1200.7819 488.4478 0.2294 1220.0000 0.1575 94.8894 488.4478 1096.5263 1191.4157 488.4404 0.2265 1230.0000 0.1561 94.0721 488.4404 1087.9733 1182.0455 488.4330 0.2237 1240.0000 0.1547 93.2548 488.4330 1079.4166 1172.6714 488.4256 0.2209 1250.0000 0.1534 92.4375 488.4256 1070.8565 1163.2940 488.4182 0.2181 Page 2 tmpkl.txt 1260.0000 0.1520 91.6202 488.4182 1062.2932 1153.9134 488.4108 0.2153 1270.0000 0.1507 90.8029 488.4108 1053.7271 1144.5299 488.4034 0.2124 1280.0000 0.1493 89.9856 488.4034 1045.1583 1135.1439 488.3960 0.2090 1290.0000 0.1479 89.1683 488.3960 1036.5872 1125.7555 488.3886 0.2051 1300.0000 0.1466 88.3510 488.3886 1028.0139 1116.3649 488.3811 0.2013 1310.0000 0.1452 87.5337 488.3811 1019.4386 1106.9723 488.3737 0.1974 1320.0000 0.1438 86.7163 488.3737 1010.8615 1097.5779 488.3663 0.1935 1330.0000 0.0000 43.1538 488.3663 1002.2828 1045.4366 488.3252 0.1719 Page 3 Stage—Discharge Curve 0.55 AkL! 0.33 0 0 0.22 0.11 0.00 ' 487.50 488.10 488.70 489.30 489.90 490.50 Stage — ft Stage—Storage Curve 3635.83 2908.67 2181.50 E 0 1454.33 727.17 0.00 v I I I I I I I I I I I I I I I I I I 1 1 487.50 488.10 488.70 489.30 489.90 490.50 Stage — ft 0.85 0.68 0.51 U 0 3 0 0.34 ,11xn Multiple Hydrographs POST DEVELOPMENT 10 -YEAR PRE DEVELOPMENT ROUTED STORM o.00 . „ , 420.00 602.00 784.00 966.00 1148.00 1330.00 Time — min