Modeling the interactions of the Manggahan and Napindan hydraulic control structures with the stage water elevations at the Sto. Niño water level station during the typhoon Ulysses flood event

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ID: 285085
2022
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Abstract
Due to the high susceptibility of flooding within Pasig City brought by the Pasig Marikina River (PMR), structural and non-structural measures were undertaken by the local government as a means for flood mitigation and management. Key projects under the structural measures include the construction of Manggahan Floodway, Rosario Weir and Napindan Hydraulic Control Structure (NHCS). The Rosario Weir was built at the confluence of PMR and the Manggahan Floodway, whereas the NHCS was built at the confluence of PMR and Napindan Channel. Both the Manggahan Floodway and Napindan Channel divert river discharge from the PMR to Laguna Bay via Rosario Weir and NHCS, respectively. Studies show that the operation of these flood control structures, i.e. the Rosario Weir and NHCS, play a significant role in flood water management. However, these flood control structures collectively performed poorly in 2009 resulting in an increase in flooded areas in the aftermath of Typhoon Ondoy. In line with this, it was found that there is limited documentation on the operations of these flood control structures with respect to its implications on the flow and flooding behavior along PMR. Therefore, this study developed a model using the river analysis tool, Hydrological Engineering Centre – River Analysis System (HEC-RAS), in order to understand the interaction of the flooding behavior along the lower Marikina River with respect to the operation rules of the flood control structures during Typhoon Ulysses. The flooding behavior was measured in terms of flow, water level, and timing of channel flow. In real practice, the Metro Manila Development Authority - Effective Flood Control Operation System (MMDA-EFCOS) base the gate controls of these flood control structures at the Sto. Niño water level gauge station, located farther upstream from the Rosario weir. However, HEC-RAS only allows for gate operations to be referenced at the water levels immediately upstream of the weir. Hence, two models were developed in HEC-RAS with different approaches in gate rules: the first (Approach 1) assumes that the MMDA-EFCOS gate operations are based immediately upstream of the gates, and the second (Approach 2) uses the calibrated rules of operation from the first approach by taking the correlation of water surface elevations between Sto. Niño and Rosario weir. Results of the simulation was validated based on applicable model performance indicators and the analysis of flooding behavior along the lower Marikina river. Results show that both approaches yielded very good performance ratings, which depict
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Authors Viray, Lennea Gutierrez
Journal Malay Journal
Year 2022
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etdb_civ/11
Keywords Keywords not found

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