Abstract:
Globally, the counties are moving toward measures for sustainable development to develop
sustainable cities in their territories. However, there are many challenges to such development. It
signifies that all the countries are working on constructing sustainable cities, but the various
challenges affect the city development's long-term viability. Among these, waste disposal is a
serious issue that can devastate a sustainable city. Thus, Water that has changed due to harmful
compounds like chemical and biological properties is referred to as wastewater. Wastewater is
categorized into three types based on its origin: home waste, industrial waste, and rainfall waste.
Therefore, Sri Lanka is a country with excellent water resources. Based on that, this study focused
on the Moratuwa MC area in Colombo district, the western province of Sri Lanka. However, water
consumption is high in this area, as are water treatment and sewage discharge. The main objective
of the study is to identify sustainable micro-level planning for effective wastewater management
in this area. The sub-objectives are to identify the sources of wastewater and hotspots
contaminated by wastewater in the study area and propose reuse strategies for wastewater
treatment. Primary and secondary data were collected for the study. The primary data were
collected through Digitizing, direct observation, questionnaires, interviews, and discussion. On the
other hand, the secondary data were obtained through books, previous research publications,
magazines, website data, municipal council, urban development authority, data from water supply
drainage board, etc. The data was gathered and evaluated using geospatial tools such as ArcGIS
10.3, JOSM, OSM, Google Earth Pro, HOT Tasking Manager, etc. Finally, the analysis reveals that
only 19 of the 42 GNDs in the study area have a Centralized Treatment Plant (CTP) located as
WWM treatment plants. Geographic information tools were primarily utilized to study to discover
more GNDs in Moratuwa MC's sustainable WWM initiatives. Plans for integrating a gravity-based
sewer network and constructing Decentralized Treatment Plants (DTP) were also recommended.
