The schematic diagram of a drainage basin which isdivided into three subbasins is shown in the followingfigure. Calculate the peak discharge at the outlet (point 3)for a rainfall event that has a return period of 10 years.Use IDF curve expressed as i₁0-6879.9/(t1.02+36.74)A₁₂ =3haC=0.15Icon=12mininletA₁ =5haC₁=0.5tcon=10minA=4hainletC=0.70|tcon=6mininletOutlet of the1L=200mT1-2-3min2 L=250m 3 basinT2-3-4min

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Answered: The schematic diagram of a drainage…

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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Q1: A hydraulic structure on a stream has been designed for return periods of 50 and ST 100 years. Maximum recorded floods in the stream are given below. Estimate the peak floods for the two return periods above, by using Gumble method. Year 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 Max. 115 128 142 99 79 71 85 102 145 flood, 153 78 50 m³/sec
B- The following table representing the relation between the recorded discharge (Q) with the water levels (W.L.) . Use a value of a = 7.50 m and Estimate the discharge corresponding to a gauge reading of 10.5 m .
Please explain how to calculate a/A for the (delta e)/(delta E) values when you get to that part in the problem, thank you. Working with figure b.
Perform the flood routing for a reach of river given X = 0.15 and K = 3 days using the inflow hydrograph with At = 1.5 day and At = 3 day below. Fill out the table and show detailed steps and calculations for each At for the first 3 rows. What is the effect of the magnitude of At on outflow hydrograph? Time (days) 0 1.5 3 4.5 6 7.5 9 10.5 12 13.5 15 16.5 18 19.5 21 Inflow (cfs) Outflow (cfs) 0 5 13 34 68 74 73 61 45 32 27 21 14 7 0 Time (days) 0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 Inflow (cfs) 0 13 34 68 74 73 61 45 32 27 21 14 7 0 Outflow (cfs)
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 . G
4. A river stage is readily measured by reading a USGS stream gage placed in the riverbed. During a storm event, the stage can be measured directly. From this, a discharge hydrograph can be inferred.The following stage levels were measured during a storm event: Analysis of this river revealed adischarge-stage correlation of Q = 12.43h2.658, where Q = discharge (m3/s) and h = stage (m).Provide both a stage hydrograph and a discharge hydrograph for this storm event.Clearly mark all axes and give each graph a title.
The ordinates of a six-hour unit hydrograph for a catchment area of 1000 km2 are given below. Time (Days) Discharge (m^3/sec) 6 80 12 200 18 146 24 80 30 50 Separate the base flow using two methods: (Tabulate and Graph) a. Straight Line Method b. Fixed Base Method 36 15 42 0
A watershed has a system of three rainfall gauges as shown on the map below. The total storm rainfall depths is: A = 74 mm, B = 67 mm and C = 82 mm. Determine the spatial average rainfall for the network of rainfall gauges using Arithmetic Average and Thiessen Polygon methods. LOkm
Example: The channel geometry used for the example calculations is shown in Figure. The bed slope for the channel reach of interest is 0.001, the main channel is a clean, straight natural stream with no rifts or deep pools (n-0.03), and the floodplains are covered with heavy weeds (n-0.05). Calculate the discharge in the channel using Horton and Pavlovskii Methods 25 15 15 in a main channel with a wetted perimeter of 45.59 ft two floodplains each with a wetted perimeter of 27 ft. The overall compound channel wetted perimeter is 99.59 ft The overall compound channel area 280 f
Q.5. Floods in a stream have the mean 600 m3/s and the standard deviation 400 m3/s. Pleaseanswer the following questions assuming normal distribution.a) What is the probability that the flood flow any year exceeds 700 m3/s?b) What is the 100-year flood discharge?
Route the following flood through a reach for which K = 22 h and x = 0.25. Plot the inflow and outflow hydrographs and determine the peak lag and attenuation. At t = 0 the outflow discharge is 40 m/s. 0 12 24 Time (h) Inflow (m³/s) 40 65 165 250 240 205 170 130 115 36 48 60 72 84 96 108 120 132 144 85 70 60 54
The following is the hydrograph resulted from a rainfall intensity of 2 cm/hr for a duration of 2 hours. If the index for the catchment is 0.5 cm/hr, use this information to develop the 2h.UH The Hydrograph Time (hours) Q (m³/s) 0 10 1 40 2 28 3 22 4 16 5 10

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