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The Gorai River off-taking from the Ganges River, is the main source of fresh water supply to the Southwest Region of Bangladesh. It is observed that, since 1989 the off-take of the Gorai fully dries up during the critical dry periods (January – May) and completely cuts off the supply of fresh water. This has caused a serious socio-ecological problem with negative environmental impact on the Southwest Region. Several past attempts of excavating the Gorai mouth have failed to produce hardly any benefit due to lack of adequate knowledge of the off-take mechanism.

For the first time a mathematical model aided three-year pilot dredging programme has been carried out for providing data and experience in devising a long-term sustainable dredging design and strategy. During the dredging, decision on the long-section, cross-section, and alignments of dredging were supported by several scenario simulations by numerical modelling of the hydraulic performance in terms of flow diversion from the Ganges, backfilling rate and erosion processes. Results with hydraulic interpretation of the corresponding simulations have been assessed to minimise the dredging effort by keeping track of the cut-off date for the dredging ensuring required flow diversion from the Ganges and to take decisions on a sustainable approach towards deciding on dredging strategy.

Our main focus in this and the next chapter is the application of Cooperative Game Theory (CGT) models to international water resource issues. In this chapter we will justify the use of CGT in water resource problems, and in particular, in international conflict-cooperation cases. The chapter reviews several important CGT concepts and demonstrates their use and calculation. After reading this chapter you will have a good grasp of basic CGT concepts and be able to apply them at both conceptual and empirical levels to simple cases.

This paper introduces the theory of social marketing to the areas of disaster management that deal with natural disasters such as earthquakes, flooding, hurricanes, etc. The theory of social marketing as a sub-theory of marketing is introduced and its implications in the area of disaster management are discussed. The paper further illustrates how social marketing can benefit various levels of government as well as organizations and communities in the disaster affected regions. A model of social marketing related to disaster preparedness will advance the use of social marketing concepts such as product, promotion, place and price to help governments, organizations, and local communities prepare for possible natural disasters with minimum negative impact.

Since the 20th century, with the development and progression of the science and technology, the ability of human transforming natural has been improving, at the same time, constantly, human are destroying the ecological environment increasingly also. The ecological environment problems have become the severe challenges of human facing. In modern times, all countries in the world began to realize deeply the significance of the protecting and improving the ecological environment, and have been exploring and putting forward sustainable development view in the constant practice. Humans began to realize that if we effectively protect the ecological environment, we must implement the sustainable development view. In the process of socialist modernization construction, there are many serious problems of the ecological environment in China, the party and the government of China is leading the Chinese people' to explore industriously the socialism path of the ecological environment instruction with Chinese characteristics, and has achieved significant results.