INTERNATIONAL JOURNAL FOR ENGINEERING AND TECHNOLOGY
(ISSN: 2180-3633 - Online)

Assoc. Prof. Dr. Lee Sun Chai
Faculty of Engineering and IT
INTI International University
Persiaran Perdana BBN
71800 Nilai
Negeri Sembilan
MALAYSIA

sunchai.lee@newinti.edu.my

2010 Vol. 1, Issue No. 1 - 1

A Study on Storm Water System in a City with Rapid Urbanization

Ni Lar Win

Faculty of Engineering and Technology, INTI International University, Malaysia

Khin Maung Win

Faculty of Engineering and Technology, INTI International University, Malaysia
 

Severe floods occur frequently in every monsoon season in some parts of Yangon (former capital of Myanmar) including Mingalar Taung Nyunt Township since storm water increases due to the rapid growth of urbanization in Yangon City. The city has grown rapidly in recent years causing reduction of pervious area and natural flood retention storage. The study area is situated in the south and south-eastern part of Yangon central downtown area. The catchment area constitutes 4.09 km2 (1.58 sq miles) covering mostly of Mingalar Taung Nyunt Township. The study area is the largest drainage basin in Yangon central area including Kandawgyi Lake having the surface area of 0.45 km2 (0.17 sq miles). The average annual rainfall in Yangon City is 2711 mm (107 inches). The monsoon season starts from mid-May and ends at the end of October. Since flooding occurs frequently in the study area whenever rainfall intensity exceeds 25 mm/hour (1 in/hr) or more, the objectives of this study are to evaluate the capacity of existing drainage system and to propose the integrated system in order to reduce the occurrence of floods in the area. Input data are 1 hr and 2 hr rainfalls with return periods of 5, 10 and 25 years, channel and pipe characteristics, elevations and slope. Peak discharges are obtained using XP-SWMM software. It is observed that the existing drainage system must be improved by lining as well as widening in order to increase the carrying capacity for the area with rapid urbanization. Moreover, Kandawgyi Lake can be used as a retention pond due to its large holding capacity.

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