Determination of Manning's roughness coefficient for concrete catchment
Manning’s roughness coefficient is one of the parameters in the Manning equation used to find uniform flow depth in an open channel. Essentially it refers to the resistive force against the flow of fluid. The determination of Manning’s roughness coefficient (Manning’s n) is a process that has been e...
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| Format: | Final Year Project (FYP) |
| Language: | English |
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2009
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| Online Access: | http://hdl.handle.net/10356/16097 |
| _version_ | 1811695829545648128 |
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| author | Ahmad Abul Hassan |
| author2 | Wong Sai Wai, Tommy |
| author_facet | Wong Sai Wai, Tommy Ahmad Abul Hassan |
| author_sort | Ahmad Abul Hassan |
| collection | NTU |
| description | Manning’s roughness coefficient is one of the parameters in the Manning equation used to find uniform flow depth in an open channel. Essentially it refers to the resistive force against the flow of fluid. The determination of Manning’s roughness coefficient (Manning’s n) is a process that has been empirically derived in the past for different surfaces and flow conditions. To determine the coefficient for a concrete catchment that is subjected to natural rainfall, the use of computer model is essential. The Kinematic Wave Model (KWM), a physically-based model which is a proven method to predict runoff, is employed. To develop such a model, the physical characteristics of the catchment, rainfall data, Manning n and a loss model needs to be specified. To evaluate the Manning’s n for simulating runoff hydrographs; the hydrograph-fitting technique is used.
In this study, rainfall and runoff data obtained from an experimental concrete catchment comprising of two overland planes and one rectangular channel were used. A selection process based on a set criteria was used to select seven events that were used for the evaluation of Manning’s n.
The findings in this study showed that the simulated hydrographs of the seven events showed a close fit to the observed hydrographs. The range of optimal Manning’s n values of the seven selected events ranged from 0.005 to 0.010 and the recommended Manning’s n value to be used in this model is 0.007. The range of Manning’s n values that were obtained in this study will prove to be useful to any user of the simulation model and the user will be able to obtain good simulated hydrographs using the recommended Manning’s n value for a concrete catchment. |
| first_indexed | 2024-10-01T07:29:41Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/16097 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:29:41Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | ntu-10356/160972023-03-03T17:14:12Z Determination of Manning's roughness coefficient for concrete catchment Ahmad Abul Hassan Wong Sai Wai, Tommy School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Water resources Manning’s roughness coefficient is one of the parameters in the Manning equation used to find uniform flow depth in an open channel. Essentially it refers to the resistive force against the flow of fluid. The determination of Manning’s roughness coefficient (Manning’s n) is a process that has been empirically derived in the past for different surfaces and flow conditions. To determine the coefficient for a concrete catchment that is subjected to natural rainfall, the use of computer model is essential. The Kinematic Wave Model (KWM), a physically-based model which is a proven method to predict runoff, is employed. To develop such a model, the physical characteristics of the catchment, rainfall data, Manning n and a loss model needs to be specified. To evaluate the Manning’s n for simulating runoff hydrographs; the hydrograph-fitting technique is used. In this study, rainfall and runoff data obtained from an experimental concrete catchment comprising of two overland planes and one rectangular channel were used. A selection process based on a set criteria was used to select seven events that were used for the evaluation of Manning’s n. The findings in this study showed that the simulated hydrographs of the seven events showed a close fit to the observed hydrographs. The range of optimal Manning’s n values of the seven selected events ranged from 0.005 to 0.010 and the recommended Manning’s n value to be used in this model is 0.007. The range of Manning’s n values that were obtained in this study will prove to be useful to any user of the simulation model and the user will be able to obtain good simulated hydrographs using the recommended Manning’s n value for a concrete catchment. Bachelor of Engineering (Civil) 2009-05-21T02:09:05Z 2009-05-21T02:09:05Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/16097 en Nanyang Technological University 45 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Civil engineering::Water resources Ahmad Abul Hassan Determination of Manning's roughness coefficient for concrete catchment |
| title | Determination of Manning's roughness coefficient for concrete catchment |
| title_full | Determination of Manning's roughness coefficient for concrete catchment |
| title_fullStr | Determination of Manning's roughness coefficient for concrete catchment |
| title_full_unstemmed | Determination of Manning's roughness coefficient for concrete catchment |
| title_short | Determination of Manning's roughness coefficient for concrete catchment |
| title_sort | determination of manning s roughness coefficient for concrete catchment |
| topic | DRNTU::Engineering::Civil engineering::Water resources |
| url | http://hdl.handle.net/10356/16097 |
| work_keys_str_mv | AT ahmadabulhassan determinationofmanningsroughnesscoefficientforconcretecatchment |