Incorporating bridges in the streamflow analysis of Cagayan de Oro River

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

Subject Categories

Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Adviser

Renan Ma. T. Tanhueco

Defense Panel Chair

Marla M. Redillas

Defense Panel Member

Mara Emilia P. Sevilla

Mario P. De Leon

Abstract/Summary

Flooding is one of the most threatening natural disasters in Cagayan de Oro. With floods causing property damage, health hazards, and even loss of life it is apparent that flooding is an issue of pressing urgency for the citizens thereby, making it evident to address and overcome its causes. Several studies have aimed to lessen the flood that are happening in the area, however, none of these have focused on the effect of bridges. This study determined constrictions that bridges make into flooding under a given rainfall scenario. The study developed watershed model and floodplain model that were simulated under 5, 10, 25, 50, and 100-year rainfall return period along Cagayan de Oro River.

Using different GIS software tools, the digital elevation model was preprocessed to visualize the watershed and floodplain area. The researchers simulated the flow under different rainfall return periods. HEC-HMS was used to simulate rainfall in the upper catchments tributary to Cagayan de Oro City and shall provide as inflows to the Cagayan de Oro River. Flow and depth patterns, profiles were obtained for the adjacent floodplain. Each rainfall return period was simulated with bridges and without bridges. Bridges that were included in the investigation were Carmen Bridge, Jr. Borja Bridge, Marcos Bridge, Puntod Kauswagan Bridge, and Pelaez Bridge. Comparing the results of simulations with and without bridge for different rainfall return period, it can be observed that the inclusion of bridges caused the depth on the river to rise up when the rainfall return period is as high as 25-year rainfall return period. Furthermore, in terms of the area bounded by the water, the bridge did not have much effect when the rainfall return period is low as 10-year return period. 5-year and 10-year return periods resulted to 1.2% and 1.95% compared to 25-year, 50-year, and 100-year return period, which resulted to 13.28%, 16.81%, and 12%., respectively. After analyzing the results, flood hazard map for each rainfall return period was generated assimilating the effect of each bridge.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU21584

Shelf Location

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

Physical Description

xi, 103 leaves : illustrations (some color) ; 30 cm.

Keywords

Bridges; Hydraulics; Floods--Philippines--Cagayan de Oro

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