Rain Garden as an Alternative Flood Mitigation Technique Using Storm Water Management Model

Florante D. Poso¹ , Jr. ² , Lady Lyn E. Escaries³ , Coleen P. Clarita⁴ , Christine M. Fabian⁵ , Lovil Christian D. Moreno⁶ , Rowena O. Satira⁷

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.4 , pp.1-8, Dec-2020

Online published on Dec 31, 2020

Copyright © Florante D. Poso, Jr., Lady Lyn E. Escaries, Coleen P. Clarita, Christine M. Fabian, Lovil Christian D. Moreno, Rowena O. Satira . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Manila, Philippines is a low-lying topography having relatively flat areas, became susceptible to frequent flooding. In 2009, Typhoon Ondoy has inflicted damages in the city due to flooding. Improvements on sewer lines and drainages are continuously implemented but still experiencing gutter and half-knee deep floods. Rain garden is a Low Impact Development system composed of berms planted on an engineered soil, allowing 30% of the surface runoff water to infiltrate into the ground. To assess rain garden as a flood mitigating technique, EPA Storm Water Management Model dynamic rainfall-runoff modelling software was utilized that allows simulation of rainfall events and analysis of its effect onto the area. The simulation of the design case with rain garden resulted to a lesser flood volume as compared to the current design. The maximum percentage difference calculated between the base design and catchment with rain garden model is 53.52% and the minimum is 38.29%.

Key-Words / Index Term :
Flood Mitigation, Low Impact Development, Rain Garden, Surface Runoff, Storm Water Management

References :
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