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T. Tingsanchali
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COINCIDENT FLOOD FREQUENCY ANALYSIS FOR DESIGN OF CHAO PHRAYA RIVER FLOOD CONTROL SYSTEM FOR BANGKOK T. Tingsanchali; T. Kitpaisalsakut
Lowland Technology International Vol 1 No 1, June (1999)
Publisher : International Association of Lowland Technology

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Flood levels of the Chao Phraya river at Bangkok is strongly influenced by the upstream river flood levels at Bangsai and the tide levels at the river mouth at Fort Chula. A flood control system was earlier proposed by the Asian lnstitute of Technology and the Thai• Austrian Consortium for Bangkok in 1986. However, no coincident flood frequency analysis was done. In this study, a coincident flood frequency analysis is applied to determine the significance of the flood levels at Bangsai and the tide levels at Fort Chula on the flood levels at Bangkok. Also, the change in the return period of flood overtopping the existing river dikes with and without the proposed flood control scheme is determined. It is found that the return period of flood overtopping the river dikes is 2.5 years when there is no flood control scheme and is more than 1000 years when considering the flood control scheme.
OPTIMAL RISK-BASED DESIGN OF CHAO PHRAYA RIVER FLOOD CONTROL SYSTEM FOR BANGKOK T. Tingsanchali; T. Kitpaisalsakul
Lowland Technology International Vol 1 No 2, Dec (1999)
Publisher : International Association of Lowland Technology

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Risk-based design is a design approach developed for quantifying the probability of failure and the expected annual damage cost of a structural system subject to variations of load such as the river flood level and of resistance such as the strength of flood protection dikes. The approach considers the joint probability density function of the load and the resistance in the computation of the probability of failure and the expected annual damage cost. In this study, an optimal risk-based design procedure of a flood control system is developed. The design approach is a computational framework using four relevant techniques, namely flood flow simulation analysis, coincident flood frequency analysis, load-resistance analysis and optimization of risk-based design. It is applied to determine the optimal capacity of the flood control system for Bangkok based on a maximum net benefit.
OPTIMISATION OF WATER MANAGEMENT IN URBAN POLDERS CASE STUDIES OF THE NETHERLANDS AND THAILAND P. Wandee; B. Schultz; T. Tingsanchali
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Rainfall in the Netherlands has moderate intensities and is more or less evenly distributed over the year while in Thailand rainfall occurs at high intensities and predominantly in the rainy season. The aim of the water management system in an urban area in a polder is to provide good drainage and discharge out of the polder. This paper presents a mathematical model for the optimisation of the main components of the water management system in urban areas in polders in the Netherlands and in Thailand. The main components of the water management system in an urban area in a polder are cross-sections of the sewers, distances between the canals, percentages of open water, canal water levels below the surface and discharge capacity of the outfall structures or the pumping stations. In order to find optional values for these main components the software package OPOL has been further developed. This package takes into account the relevant hydrological processes, construction and operation and maintenance costs for the water management system and damages due to high groundwater tables, water on the street, or even inundation under influence of rainfall and water level fluctuations in the urban canals. Optimising such a system aims at determining the main components in such a way that the annual equivalent costs will be minimal. The results of a case study for an urban polder in the area of the Principal Water-board of Delfland, the Netherlands and of another one in Bangkok, Thailand are shown. It was found that the canal water level has the largest influence on damages in these urban polders.
Co-Authors B. Schultz P. Wandee T. Kitpaisalsakul T. Kitpaisalsakut