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HomeMy WebLinkAbout1.31 Hydrology CalculationsHydrograph Summary Report 1 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 4.447 60 840 92,711 ------ ------ ------ North Hangs Baseline 2 SCS Runoff 8.447 60 780 157,015 ------ ------ ------ Phase 1 Mining 3 SCS Runoff 10.94 60 780 190,477 ------ ------ ------ Phase 2 Mining 4 SCS Runoff 9.224 60 780 167,558 ------ ------ ------ End of Mining 5 SCS Runoff 7.793 60 840 147,022 ------ ------ ------ Final Reclamation Surface Hydrology New.gpw Return Period: 100 Year Thursday, 02 / 16 / 2023 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022 Thursday, 02 / 16 / 2023 Hyd. No. 1 North Hangs Baseline Hydrograph type = SCS Runoff Peak discharge = 4.447 cfs Storm frequency = 100 yrs Time to peak = 840 min Time interval = 60 min Hyd. volume = 92,711 cuft Drainage area = 64.700 ac Curve number = 74* Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = LAG Time of conc. (Tc) = 132.40 min Total precip. = 2.17 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 * Composite (Area/CN) = [(1.400 x 98) + (1.500 x 39) + (4.900 x 74) + (23.200 x 74) + (10.900 x 74) + (22.800 x 74)] / 64.700 2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 1680 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) North Hangs Baseline Hyd. No. 1 -- 100 Year Hyd No. 1