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Manning's roughness coefficient of 0.013.

Manning's roughness coefficient of 0.013.

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter7: Seepage
Section: Chapter Questions
Problem 7.6P
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Question
QUESTION 1 a) Figure Q1(a) shows the existing triangular concrete Channel 1 at Sungai Siput with the bed slope is 0.0016 and the channel has a Manning's roughness coefficient of 0.013. Due to flood risk at that area, there is a proposal to upgrade the channel to the Channel 2. Determine the flowrate in Channel 2 if the bed slope and Manning coefficient are the same with the Channel 1. (CO2-PO2) (C4) X ▼ D=0.5m Channel 1 Figure Q1(a) D=1.0m B =2.0m Channel 2 60⁰ b) A natural drainage system with a condition described as "natural streams, rough" in Bandar Kuantan was flooded recently. The flow cross-sectional area, wetted perimeter and channel slope at the time of the peak flood were 150 m², 25 m and 0.0008 respectively. If 40% from the peak flood need to be diverted to the nearest concrete culvert with a slope of 0.035%, suggest the suitable size of the culvert if the water is to be conveyed at a depth of 0.8d (Hint: d is diameter of culvert). (CO2-PO2) (C5)
Transcribed Image Text:QUESTION 1 a) Figure Q1(a) shows the existing triangular concrete Channel 1 at Sungai Siput with the bed slope is 0.0016 and the channel has a Manning's roughness coefficient of 0.013. Due to flood risk at that area, there is a proposal to upgrade the channel to the Channel 2. Determine the flowrate in Channel 2 if the bed slope and Manning coefficient are the same with the Channel 1. (CO2-PO2) (C4) X ▼ D=0.5m Channel 1 Figure Q1(a) D=1.0m B =2.0m Channel 2 60⁰ b) A natural drainage system with a condition described as "natural streams, rough" in Bandar Kuantan was flooded recently. The flow cross-sectional area, wetted perimeter and channel slope at the time of the peak flood were 150 m², 25 m and 0.0008 respectively. If 40% from the peak flood need to be diverted to the nearest concrete culvert with a slope of 0.035%, suggest the suitable size of the culvert if the water is to be conveyed at a depth of 0.8d (Hint: d is diameter of culvert). (CO2-PO2) (C5)
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