Integrated Water Resource Management for Mega City: A Case Study of Dhaka City, Bangladesh - page 4

The Conceptual Framework of Integrated Water Resources Management (IWRM) for Dhaka City

A conceptual framework of Integrated Water Resources Management (IWRM) has been developed for management of the water resource system (WRS) of Dhaka City. The steps of the decision-making process in IWRM are shown in Figure 5. In this process, development objectives and goals should be defined considering all problems, issues and constraints. Then strategies to achieve the objectives should be set followed by generation of water management options. After that, impacts of each water resource system (WRS) management option and national development goal should be assessed under different scenarios. During impact analysis, strategies, scenarios and management options should be reviewed in terms of national development objectives. Finally, best water management options will be selected through multi criteria analysis (MCA). Following this framework, problems and issues of the water resource system of Dhaka City were identified and best management options were selected. Considering the major water issues and problems discussed above, the following model is being proposed.

 

Fig05
Figure 5: Conceptual framework of IWRM

 

This paper has identified possible options to reduce problems/issues in Dhaka City. In summary, Dhaka City suffers from flooding, water deficits, pollution in both surface water and ground water and overexploitation of ground water. The developed possible options are:

Option 1: Balance surface and groundwater development

  • Reserve the surface water for environmental demand and domestic supply
  • Sustainable use of ground water
  • Strong enforcement of laws for surface water and ground water pollution from different sectors
  • Increase surface water availability by augmenting water from Jamuna to Buriganga through Dhaleswari to save the Buriganga river and protect the environment for the population of Dhaka City
  • Ban water use from wetlands and reduce LLP use in the region

Option 2: Live with flood and demand management

  • Flood proofing
  • Flood preparedness and early warning systems
  • Decrease water loss by using lined channels
  • Regulatory laws on discharging industrial waste

Option 3: Full development

  • Pump the water from Jamuna to Dhaleswari and Old Brahmaputra to meet the sectoral demands
  • Waste water treatment and reuse
  • Effective water pricing
  • Rain water harvesting
  • Rehabilitate the existing FCD project