Q 1 (part ii) A 4m wide rectangular channel (n=0.013) carries the water on a 2% slope from the maximum flow of a 100-hectare construction near the Homebush Olympic site. Determine the water depth for a 20-year storm if the time of concentration is 45 minutes and the runoff coefficient C20 is 0.55. (Storm Intensity in millimeters per hour at Homebush Olympic Site is given in the below table) Duration Average Storm Recurrence Interval (years) 1 2 5 10 20 50 100 5 min 98.6 126.5 161.9 180.8 207.2 241.4 267.4 10 min 75.7 97.5 126.1 141.5 162.8 190.7 211.8 15 min 63.3 81.8 106.4 119.9 138.4 162.6 181 30 min 45 58.3 87.2 101.2 119.6 133.7 45 min 36.1 46.9 71.1 82.8 98.3 110.2 60 min 30.7 40 61.2 71.4 85 95.5 3 hr 15.2 19.8 30.1 35.1 41.7 46.8 6 hr 9.7 12.6 19 22.2 26.4 29.6 12 hr 6.2 8 12.1 14.1 16.7 18.7 24 hr 4.02 5.23 7.9 9.19 10.9 12.21 72 hr 1.92 2.5 3.77 4.38 5.19 5.81 Select one: O a. 0.78 O b. 0.42 O c. 0.66 O d. 0.52 76.9 62.4 53.5 26.4 16.7 10.6 6.94 3.31

Q 1 (part ii) A 4m wide rectangular channel (n=0.013) carries the water on a 2% slope from the maximum flow of a 100-hectare construction near the Homebush Olympic site. Determine the water depth for a 20-year storm if the time of concentration is 45 minutes and the runoff coefficient C20 is 0.55. (Storm Intensity in millimeters per hour at Homebush Olympic Site is given in the below table) Duration Average Storm Recurrence Interval (years) 1 2 5 10 20 50 100 5 min 98.6 126.5 161.9 180.8 207.2 241.4 267.4 10 min 75.7 97.5 126.1 141.5 162.8 190.7 211.8 15 min 63.3 81.8 106.4 119.9 138.4 162.6 181 30 min 45 58.3 87.2 101.2 119.6 133.7 45 min 36.1 46.9 71.1 82.8 98.3 110.2 60 min 30.7 40 61.2 71.4 85 95.5 3 hr 15.2 19.8 30.1 35.1 41.7 46.8 6 hr 9.7 12.6 19 22.2 26.4 29.6 12 hr 6.2 8 12.1 14.1 16.7 18.7 24 hr 4.02 5.23 7.9 9.19 10.9 12.21 72 hr 1.92 2.5 3.77 4.38 5.19 5.81 Select one: O a. 0.78 O b. 0.42 O c. 0.66 O d. 0.52 76.9 62.4 53.5 26.4 16.7 10.6 6.94 3.31

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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6.4. The direct runoff hydrograph resulting from a 5cm of effective rainfall of 6hr duration is given below. Determine the area of the catchment and the ordinates of the 6hr UH. Time (hr) 6 12 18 24 30 36 42 48 54 60 66 72 Direct runoff 0 25 175 320 360 310 230 165 105 60 30 10 0 (m³/s) Ans. Area of the catchment =773.28km² The ordinates of 6hr UH at 6hr intervals are (0,5,35,64,72,62,46,33,21,12,6,2,0)
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Reservoir & Channel routing.
Example4: Cumulative Rainfall depth 10 cm and cumulative runoff 5.8cm Find Ø - index if rainfall according following data : Time (hr.) 1 2 3 4 6 7 8. Rainfall intensity (cm.) 0.4 0.9 1.5 2.3 1.8 1.6 1 0.5
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