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SWOT Analysis of Urban Development on Kolonnawa Urban Council, Sri Lanka

100%
Nishanthi K., Dissanayaka D. M. N. P.
World News of Natural Sciences
|
2021
|
vol. 39
46-60
EN
Changes in land use and land cover are a result of urban growth. Human activity has a vital role in city development since it helps to increase people's living standards, property values, accessibility, and safety. This study looked into the importance of legal procedures in accordance with the country's long-term development goals. It was also used to reveal the area's strengths, weaknesses, opportunities, and risks to the environment and people due to urban development. The study gathered data from both primary and secondary sources. The SWOT analysis was used to highlight the implications of urban growth in the research area. Maps analysis has been done using Geographic Information Systems (GIS). The statistical data on unauthorized filling was analyzed using Microsoft Excel. The findings show that, rather than being a source of strength and opportunity, urban expansion is also a source of weakness and risks. Threats to natural resources and humans, in particular, are disproportionately significant. Due to land demand, 62% of the land has been developed, jeopardizing the available marsh and paddy area. The growth of Kolonnawa urban council, which is located below mean sea level (MSL), causes flooding in the area every year. Based on a 50 year flood inundation, the grama niladari divisions of Wadulla, Orugodawatta, Meethotamulla, Gajabapura, Wijayapura, and Salamulla have been declared as high impacted locations.
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An assessment of water quality temporal variation in Sri Jayawardenapura Kotte canal, Sri Lanka

81%
Nishanthi K., Dushanan R., Mathanraj S., Priyadharshini C.
World News of Natural Sciences
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2021
|
vol. 38
139-157
EN
Assessment of temporal variation of the water quality is an essential aspect of evaluating temporary changes in a water body caused by natural or artificial contributions. The study aims to assess the water quality temporal variation and the water quality index over the year from 2010 to 2019. Water sampling was carried out near the bridge of the Kotte canal. Water quality parameters such as pH, electrical conductivity (EC), temperature, dissolved oxygen (DO), ammonia, nitrate, phosphate, and chemical oxygen demand (COD) were determined to assess the quality of water at different periods. It has been calculated based on the standard of the central environmental authority of Sri Lanka. The weighted arithmetic index method has been used to calculate the water quality index. The water quality index of the study area was recorded as good (33.60760) in 2010 and poor in 2013 (56.95663), 2016 (52.37269), and 2019 (69.04417). The study revealed that the water temperature in the canal fluctuates with the time and climate of the area. The EC of the water is registered within the reference range. However, pH, COD, DO, and ammonia are the main water parameters deviating from the reference range. It is observed that the leading causes of the deterioration of water quality are human activities, the illegal discharge of sewage and industrial wastewater, the lack of adequate sanitation facilities, and urban runoff.
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