DHAKA WATER SUPPLY SYSTEM MANAGEMENT DEVELOPS A MODEL OF URBAN DRAINAGE OPRATION AND MAINTENANCE PROJECT WITH SOFTWARE TECHNOLOGY

Abstract

Dhaka Water Supply System Management (i.e.; Dhaka WASA) is the main service provider in drainage system maintenance in Dhaka city. In the mega-city of Dhaka the capital of Bangladesh, with over 10 million people facing acute problems in increasing urban flooding, storm sewrage and sanitation which affecting millions of inhabitants and businesses every year. To remedy these urban flooding problems the responsible authority, (DWASA) has started the Urban Dredging Demonstration Project (UDDP) under the existing partnership with Vitens Evides International from the Netherlands. Once Dhaka city has 49 canals which served as the natural drainage system but with the course of time most of canals are illegally occupied and disappeared and rest of them have become narrower, silted up, and blocked. To overcome this problems adoption of new dredging tecnology and longterm dredging plan with WIT (sediment information system) offers a solution. WIT is a dynamic web-based GIS application for planning and maintenance operations of drainage system. It offers a unique combination of tools which makes it possible to process data and prepare long-term dredging plans. Practical modules allow for the optimisation of maintenance dredging by calculating quantities dredged material, the testing of data quality and planning of maintenance dredging. The data can be visualized in tables, diagrams, charts for invsetgating the following questions: location of dredged waterways, volume of sediment (material) to be dredged, quality (chemical and physical) of the dredged materials, total costs of the dredging operations and maintenance, available sites for disposal.