Rainfall-runoff analysis for designing low impact development (LID) to mitigate flooding in an urban area

Added Title

Rainfall-runoff analysis for designing low impact development (LID) to mitigate flooding in an urban catchment

Date of Publication

2018

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Civil Engineering with Spec in Hydraulics and Water Resources Engg

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Adviser

Marla Chua Maniquiz Redillas

Defense Panel Member

Mario P. De Leon
Joel G. Galupino
Maria Emilia P. Sevilla

Abstract/Summary

The rise of urbanization has led to various land developments that often results to the application of impervious layers to support the progression, negatively affecting the infiltration capacity of the cities in the process. Simultaneously, the popularity of green engineering solutions has also been steadily increasing, given its potential as a solution to the aforementioned problem with the additional benefit of being environmentally friendly. Low impact development (LID), is one of such solutions. LIDs mimic the natural process of the water cycle by reintroducing pervious surfaces, further supplementing the existing drainage structures. The development of this system, however, is highly dependent on the availability of the hydrologic data to allow characterization of the rainfall-runoff relationship, which is vital in designing efficient and economic LID.

In the Philippines, the attributes of runoff are unaccounted for, while rainfall is not characterized extensive enough hence the primary objective of the research is to identify the rainfall and runoff characteristics in San Juan Water Quality Management Area (San Juan WQMA). Rainfall data was analyzed through multiple statistical analysis such as frequency of occurrence, distribution, and probability analysis to characterize rainfall.

For the application of LID, it was found that the design storm would have a mean intensity of 7.6mm/hour or about 28 mm of daily rainfall depth. A rainfall-runoff simulation was also conducted to quantify the relationship of rainfall and runoff, which is represented by the runoff coefficient, which was established to be 0.7781, above the range of the standards set by the Department of Public Works and Highways. The principles of water quality volume were then employed to obtain a theoretical runoff for every part of the San Juan WQMA using the factors retrieved from the analysis.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU21626

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

xv, 171 leaves : illustrations (some color) ; 30 cm.

Keywords

Hydraulics; Hydraulic engineering

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