Assessment of drainage capacity of main klongs in Bangkok after maintenance dredging | |
| Author | Khoun Sambo |
| Call Number | AIT Thesis no.WM-99-10 |
| Subject(s) | Hydraulic engineering--Thailand--Bangkok Drainage--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | Bangkok, the capital city of Thailand, is located in the Chao Phraya River delta with flat ground elevation of 0 to 1.5 m MSL. Since the last decade, with increased of urbanization in Bangkok. The existing drainage system can not work effectively, therefore an assessment of capability of main drainage system in the eastern sub-urban of Bangkok was carried out, and the hydraulic structures along main klong were studied and calibrated for their hydraulic performance. In this study, the efficiency of the pump capacity at Phra Khanong pumping station was assessed and discharge coefficient Cs of upstream gate at Klong Phra Khanong and Klong Saen Saep are determined. The result showed that the average efficiency of pumping station is 77 %, and the general relationship of discharge coefficient with relative ratio of submerged depth and gate openning can be determined as Cs= 0.95/(hs/Go)0 ยท 7573 . This proposed equation was supposed to be adopted for all sluice gates in Bangkok Metropolitan Administration having the similar design and dimensions. In this study, HEC-RAS model was applied in order to check the implementation of the model into the main drainage system. The hydraulic parameters of klong system, cross-section, inflow from upstream, lateral inflow, outflow at the downstream and control structure data were collected from the project site and input into the model for calibration. After simulation the computed water level were compared with the observed water level and found satisfactory. The channel Manning's roughness coefficient values of klongs are between 0.03 to 0.04. The model was applied for two cases to improve drainage capability. The result showed that the water level in case 1, which was to deepening the klong bottom varying from 3 m to 5 m, the water level is decreased about 75 cm, and the overflow section reduced around 90 %. In case 2, which was maintain dredging, the water level reduced around 10 cm, and the overflow section reduced around 10 %. |
| Year | 2000 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Sutat Weesakul; |
| Examination Committee(s) | Tawatchai Tingsanchali;Izumi, Norihiro ; |
| Scholarship Donor(s) | Sida-Mekong; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |