Answered: Time Chr) 1 5 269 538 807 645 484/ 523…

Engineering

Civil Engineering

Time Chr) 1 5 269 538 807 645 484/ 523 161 Flocw (CFS) 4.

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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Concept explainers

Concepts of Flood Control

Flooding is a temporary overflow of water that submerges or covers the the usually dry land. It can also be defined as the overflow of the excess amount of water that covers a huge area of land which is normally dry.

Question

The flow ordinates of a 1- hr UH are as follows:

Calculate the DRH for a two hour Strom in which 4" of excess rain occurs at a constant rate. Also find the area of the basin

Time
Chr)
1
4
269
538 807
645 484 523/ 161
Flocw (CFS)

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H.w: Two rain storms, the intensity of the second, no matter how double the first, with equal durations of 12 hours, the storm, the observed runoff was recorded and the surface runoff estimated as shown in the table below. If the area of the mount 600 km? The value of the Fani index was 0.133, which estimated the intensity of the two storms. Time 1 3 4 5 7 8 9. (day) Q (m³/sec) 63 151 133 90 63 44 29 20 20 Base flow 20 22 25 28 28 26 23 21 20 20 (m³/sec) 2. 20
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2-A 3 hours storm produces a flood hydrograph as: t (hr) Q (m³/s) 0 3 4 9 6 12 9 18 12 15 18 21 24 27 20 16 20 10 8 6 Determine 3 hr-UH, if the catchment area is 50 km². 3- Find the flood hydrograph of 3 hrs storm (use the UH of Q2). Total precipitation is 14.5 cm and 9-index is 1cm/hr. 30 4
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In the standard SCS-CN method of modelling runoff due to daily rainfall, if CN = 75, the runoff magnitude for a one-day rainfall of 100 mm is nearly A 17 mm B 31 mm C 41 mm D 57 mm
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Q2. Two storms having duration of 4-hv and 2.hr respectively. If the rainfall excess values for the two storms were 2cm f 3cm respectively occurs Successive calculate the resulting direct runoff hydrographif the 2-hr UH For the Catchment is given below Time hr 2 4 G 10 12 14 16 18 2hr UH 25 50 75 125 100 60 20
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2 %V9 li. 3 (9 This question requires one response per row The base flow for this direct runoff hydrograph is: 0 4 8h o Index = 0.135 cm/h Rainfall excess = 5.52 cm 30 25 20 15 Direct runoff 5.52 cm 10 A Base flow -6 0 12 18 24 30 36 42 48 54 60 66 Time in hours -6 8 5.52 48 Discharge (m/s) 3.26 cm 2.26cm