Homework Help is Here – Start Your Trial Now!
Engineering
Civil Engineering
|| 21 Using rational method, rainfall intensity-duration curves and the data given in Fig. P 2.27 com- pute the diameter of the outfall sewer. The length of lines, drainage areas, and inlet times are marked in Fig. P 2.27 (a). Assume: (i) Run-off coefficient for the entire area 0.30 (ii) Velocity of flow in sewers flowing full = 0.75 m/sec (iii) 5-year average frequency curve may be used, Fig. P 2.27 (b), (iv) Hydraulic elements for circular pipes flowing full are given in Table 2.2. Table 2.2 Hydraulic elements for a circular pipe flowing full Discharge (lps) 400 600 690 1500 2000 1A=0.016 km Inlet time = 5 min, A=0.032. km Inlet time = 5 min 1 Diameter (mm) Manhole 1 120 m sewer, 180 m- sewer BManhole 2 A=0.024 km Inlet time = 8 min 450 525 1050 1350 1450 (a) Watershed system Most remote point Manhole 3 200 Rainfall intensity, mm/hr Discharge 175 150 125 100 75 50 Slope of Pipe (m/m) 25-year ave! frequency 10-year ave! frequency 5-year ave. frequency Velocity (m/sec) 0.025 0.020 0.00055 0.75 0.001 1.55 0.001 1.20 [690 lps, 0.75 m/s, 1 m laid at 1 in 1800] 2.7 2.8 0 5 10 20 30 40 50 60 70 80 90 100 110 120 Duration of rainfall, min (b) Rainfall intensity-duration curves for computation of storm water runoff Fig. P2.27 Storm water drainage project

|| 21 Using rational method, rainfall intensity-duration curves and the data given in Fig. P 2.27 com- pute the diameter of the outfall sewer. The length of lines, drainage areas, and inlet times are marked in Fig. P 2.27 (a). Assume: (i) Run-off coefficient for the entire area 0.30 (ii) Velocity of flow in sewers flowing full = 0.75 m/sec (iii) 5-year average frequency curve may be used, Fig. P 2.27 (b), (iv) Hydraulic elements for circular pipes flowing full are given in Table 2.2. Table 2.2 Hydraulic elements for a circular pipe flowing full Discharge (lps) 400 600 690 1500 2000 1A=0.016 km Inlet time = 5 min, A=0.032. km Inlet time = 5 min 1 Diameter (mm) Manhole 1 120 m sewer, 180 m- sewer BManhole 2 A=0.024 km Inlet time = 8 min 450 525 1050 1350 1450 (a) Watershed system Most remote point Manhole 3 200 Rainfall intensity, mm/hr Discharge 175 150 125 100 75 50 Slope of Pipe (m/m) 25-year ave! frequency 10-year ave! frequency 5-year ave. frequency Velocity (m/sec) 0.025 0.020 0.00055 0.75 0.001 1.55 0.001 1.20 [690 lps, 0.75 m/s, 1 m laid at 1 in 1800] 2.7 2.8 0 5 10 20 30 40 50 60 70 80 90 100 110 120 Duration of rainfall, min (b) Rainfall intensity-duration curves for computation of storm water runoff Fig. P2.27 Storm water drainage project

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
See similar textbooks
icon
Related questions
Question
(Civil engineering hydrology)
|| 21 Using rational method, rainfall intensity-duration curves and the data given in Fig. P 2.27 com- pute the diameter of the outfall sewer. The length of lines, drainage areas, and inlet times are marked in Fig. P 2.27 (a). Assume: (i) Run-off coefficient for the entire area 0.30 (ii) Velocity of flow in sewers flowing full = 0.75 m/sec (iii) 5-year average frequency curve may be used, Fig. P 2.27 (b), (iv) Hydraulic elements for circular pipes flowing full are given in Table 2.2. Table 2.2 Hydraulic elements for a circular pipe flowing full Discharge (lps) 400 600 690 1500 2000 1A=0.016 km Inlet time = 5 min, A=0.032. km Inlet time = 5 min 1 Diameter (mm) Manhole 1 120 m sewer 180 m- sewer BManhole 2 A=0.024 km Inlet time = 8 min 450 525 1050 1350 1450 (a) Watershed system Most remote point Manhole 3 Rainfall intensity, mm/hr Discharge 200 175 150 125 100 75 50 Slope of Pipe (m/m) Velocity (m/sec) 25-year ave! frequency 10-year ave! frequency 5-year ave. frequency 0.025 0.020 0.00055 0.75 0.001 1.55 0.001 1.20 [690 lps, 0.75 m/s, 1 m laid at 1 in 1800] 2.7 2.8 0 5 10 20 30 40 50 60 70 80 90 100 110 120 Duration of rainfall, min (b) Rainfall intensity-duration curves for computation of storm water runoff Fig. P2.27 Storm water drainage project 22 Explain step by step the procedure you would adopt to prepare the depth area-duration curves
Transcribed Image Text:|| 21 Using rational method, rainfall intensity-duration curves and the data given in Fig. P 2.27 com- pute the diameter of the outfall sewer. The length of lines, drainage areas, and inlet times are marked in Fig. P 2.27 (a). Assume: (i) Run-off coefficient for the entire area 0.30 (ii) Velocity of flow in sewers flowing full = 0.75 m/sec (iii) 5-year average frequency curve may be used, Fig. P 2.27 (b), (iv) Hydraulic elements for circular pipes flowing full are given in Table 2.2. Table 2.2 Hydraulic elements for a circular pipe flowing full Discharge (lps) 400 600 690 1500 2000 1A=0.016 km Inlet time = 5 min, A=0.032. km Inlet time = 5 min 1 Diameter (mm) Manhole 1 120 m sewer 180 m- sewer BManhole 2 A=0.024 km Inlet time = 8 min 450 525 1050 1350 1450 (a) Watershed system Most remote point Manhole 3 Rainfall intensity, mm/hr Discharge 200 175 150 125 100 75 50 Slope of Pipe (m/m) Velocity (m/sec) 25-year ave! frequency 10-year ave! frequency 5-year ave. frequency 0.025 0.020 0.00055 0.75 0.001 1.55 0.001 1.20 [690 lps, 0.75 m/s, 1 m laid at 1 in 1800] 2.7 2.8 0 5 10 20 30 40 50 60 70 80 90 100 110 120 Duration of rainfall, min (b) Rainfall intensity-duration curves for computation of storm water runoff Fig. P2.27 Storm water drainage project 22 Explain step by step the procedure you would adopt to prepare the depth area-duration curves
Expert Solution
steps

Step by step

Solved in 5 steps with 4 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Infiltration
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Structural Analysis
Structural Analysis
Civil Engineering
ISBN:
9781337630931
Author:
KASSIMALI, Aslam.
Publisher:
Cengage,
Structural Analysis (10th Edition)
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Sustainable Energy
Sustainable Energy
Civil Engineering
ISBN:
9781337551663
Author:
DUNLAP, Richard A.
Publisher:
Cengage,
Traffic and Highway Engineering
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS