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2 Journal of Water and Land Development

2 2022

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Design of water supply networks for water transfer to the urban area Case study : Balikpapan city

Huy Dinh T.N., Dwijendra Ngakan K.A., Poltarykhin Andrey, Suksatan Wanich, Nahi Nooraldeen S., Mahmudiono Trias, Hai Nguyen T., Kadhim Mustafa M., Singh Krishanveer, Ahmed Alim A.A.

Journal of Water and Land Development

2022

no. 54

251--254

The growing population and the development of industries in all countries of the world have created a very important and complex issue for water supply to cities. Today, many parts of the world are facing the problem of water shortage and this problem cannot be easily solved. In addition to the proper use of water resources and preventing the loss of natural water, the establishment of regional water supply networks is effective in meeting the future needs of the people. A water distribution network (water supply network) is a set of interconnected pipelines used to transport and distribute water in a complex. In designing the water distribution network, factors such as the type of water distribution network, water pressure, water velocity, design flow, minimum pipe diameter, pipe material and many other factors should be considered. In this study, we have tried to design the water supply network of a part of Balikpapan city in Indonesia. The design method led to the determination of pressure values in the connection nodes, pipe diameters, flow rate and velocity in the pipes. All the existing criteria are considered in the design of the water supply network. Although this study has been implemented for a specific study area, it can be of great help to designers in designing the water supply network.

Compare and evaluate the performance of structural flood risk management options

Dwijendra Ngakan K.A., Majdi Ali

Journal of Water and Land Development

2022

no. 54

172--176

One of the most important natural phenomena that causes harmful damage around the world is the occurrence of sudden and severe floods. There are various solutions to deal with floods. Among the structural measures of flood risk management, we can mention the construction of levee, detention basin, channel modification, and a combination of the mentioned measures. Manafwa is a flood-prone area in Uganda currently protected by a 6.6 m high levee. Unfortunately, the existing levee does not have ideal performance, and the probability of failure is very high. Therefore, the main purpose of this study is to compare seven flood management measures in the flood-prone area of Manafwa and to select the best flood risk management proposal. These management measures are: 1) construction of a levee with a height of 6.5 m, 2) construction of a levee with a height of 7 m, 3) construction of a levee with a height of 7.5 m, 4) construction of a levee with a height of 8 m, 5) channel modification, 6) detention basin and 7) a combination of structural measures of channel modification and detention basin. The results show that although building a levee with a height of 8 m is more expensive than other options, but it reduces the expected annual flood damage to about USD30.5 thous.