Hydrology Problem Solutions and Techniques
Explore solutions and techniques for hydrology problems, including determining unit hydrographs, runoff calculations, cumulative rainfall analysis, and excess rainfall determination. Solve problems related to watershed hydrology with step-by-step examples and illustrations.
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Presentation Transcript
S Curves From Mays, 2011, Ground and Surface Water Hydrology
Example The 1- hr unit hydrograph for a watershed is given below. Determine the 2 hr unit hydrograph. Time ( hr) Unit hydrograph ( cfs) 1 2 3 4 5 6 10 100 200 150 100 50
S Curve to Develop 2 hr unit hydrograph Time (hr) Unit hydrograph (cfs) 1 10 2 100 3 200 4 150 5 100 6 50 7 8 9 10 11 12 13 14 700 S Diff 2 hr Unit Hydrograph 5 55 150 175 125 75 25 0 10 110 310 460 560 610 610 610 610 610 610 610 10 110 300 350 250 150 50 700 10 100 200 150 100 50 10 100 200 150 100 50 10 110 310 460 560 610 610 610 610 610 610 610 600 10 100 200 150 100 50 500 10 100 200 150 100 50 10 100 200 150 100 50 400 0 10 100 200 150 100 50 0 0 300 0 0 200 0 100 0 0 0 0 2 4 6 8 600 250 500 200 400 300 150 200 100 100 50 0 0 2 4 6 8 10 12 0 0 2 4 6 8
Problem 8.5.3 Suppose the 4-hr unit hydrograph for a watershed is Time (hr) 0 2 4 6 8 10 12 14 Unit hydrograph (m3/s/10 mm) 0 15 45 65 50 25 10 0 a) Determine the 2-hr unit hydrograph b) A design storm has 1 cm/hr in first 2 hr and 0.5 cm/hr in the second 2 hr. Baseflow = 10 m3/s. Calculate the total runoff hydrograph
Problem 8.2.4. Cum. Rain Instantaneous Runoff Time 4:00 4:30 5:00 5:30 6:00 6:30 7:00 7:30 8:00 8:30 9:00 9:30 10:00 10:30 0 0 30 80 90 95 127 130 132 0.3 4.2 11.3 13 34 45.3 21.2 9.3 4.8 2.5 1.4 0.8 0
Problem 8.2.4. Cum. Rain Instantaneous Runoff Inc Vol (m3) Inc Depth (mm) Time 4:00 4:30 5:00 5:30 6:00 6:30 7:00 7:30 8:00 8:30 9:00 9:30 10:00 10:30 0 0 Instantaneous Runoff (m^3/s) 30 80 90 95 127 130 132 0.3 4.2 11.3 13 34 45.3 21.2 9.3 4.8 2.5 1.4 0.8 270 4050 13950 21870 42300 71370 59850 27450 12690 6570 3510 1980 720 0.032 0.482 1.661 2.604 5.036 8.496 7.125 3.268 1.511 0.782 0.418 0.236 0.086 50 45 40 35 30 25 20 15 0 10 31.74 5 0 3:36 4:48 6:00 7:12 8:24 9:36 10:48
Determining the index and Excess Rainfall Hyetograph Phi . DT 26.75 60 Excess Rainfall (mm) 50 Incremental Rainfall (mm) 0 40 30 50 10 -16.753326 5 -21.753326 32 5.246674 5.246674 3 -23.753326 2 -24.753326 3.246674 3.246674 23.246674 23.24667 30 0 0 20 0 0 10 Sum positive 31.74 0 3:30 4:00 4:30 5:00 5:30 6:00 6:30 7:00 7:30
