Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Transcribed Image Text:Q3-
A - The analysis of a storm yielded the following information regarding isohyets .calculate
the average depth of rainfall?
Isohyets interval in
70-80
80-90
90-100
100-110
110-120
120-130
mm
Area between
10
85
113
98
136
67
isohyets in Km?
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- A watershed covering 28.16 mi2 has a system of seven rainfall gages, as shown on the map in the Figure. Using the total storm rainfall depths given in the accompanying table, determine the average rainfall over the watershed using: (a) arithmetic averaging and (b) the Thiessen polygon method. Gage ABCDEFG А с P₁ (in.) 5.13 6.74 9.00 6.01 5.56 4.98 4.55 A₁ (mi²) 1.74 6.70 1.77 13.02 0.83 2.68 1.42 28.16 B. . E 1 in. = 3.9 mi .F . Garrow_forwardWatershed problem(Hydrology)arrow_forwardConsider the watershed below, with 8 precipitation stations (A-H) and corresponding Thiesson polygons (areas indicated in large blue numbers, km2) (see image) Using the Theisson polygon method, what is the annual precipitation volume (m3)?arrow_forward
- The ordinates of a 12-h unit hydrograph are as given below: Time (h) 0 12 12-h UH 0 32 24 36 48 60 72 84 96 130 126 98 75 50 77 69 108 30 120 132 15 70 ordinates (m3/s) A storm had three successive 12-h intervals of rainfall magnitude of 3.5, 10.2 and 20.3 cm, respectively. Assuming a q- index of 0.15 cm/h and a base flow of 50 m³/s, determine and plot the resulting (flood) hydrograph of flow.arrow_forwardI need the correct answerarrow_forwardTable Q4 shows the details of the storm hydrograph with the corresponding direct discharge. The given time interval is 3 hours between the readings. Q4 Table Q4 Excess rainfall (mm) 11 Time (hr) Direct discharge (m³/s) 3 70 28 230 9. 30 600 12 1400 15 2380 18 3300 21 4880 24 6320 27 3305 30 350 33 300 36 100 By using the convolution method, determine the unit hydrograph ordinates. (a) (b) Illustrate the unit hydrograph.arrow_forward
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