METRO MANILA URBAN FLOODING ALERT SYSTEM UP DISASTER RISK EXPOSURE AND ASSESSMENT FOR MITIGATION PROGRAM UNIVERSITY OF THE PHILIPPINES DILIMAN

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PURPOSE Perennial flooding over Metro Manila has been severely affecting millions, inspiring a need for an urban flooding alert system.

PURPOSE Where are the possible flooded areas? How deep is the expected flood? Is it passable by light vehicles?

URBAN FLOODING ALERT SYSTEM Awareness among the citizens is the first step in alleviating the destructive impact of flooding.

DESIGN CONCEPT Flood points were identified based on the inundation map generated by a LiDAR based flood simulation. Surface Flooding Map of Metro Manila Flood Simulation Metro Manila LiDar DEM Short Duration Rainfall Scenario

DESIGN CONCEPT These flood points were assigned to corresponding Automated Rain Gauges (ARGs) using the Thiessen Polygon Method. Flood points were identified based on the inundation map generated by LISFLOOD flood simulation.

DESIGN CONCEPT These flood points were assigned to corresponding Automated Rain Gauges (ARGs) using the Thiessen Polygon Method. An ARG is triggered when rain thresholds are reached. Flood points were identified based on the inundation map generated by LISFLOOD.

ARG is triggered when rain in ARG reaches 15mm/1hr Level 1 flood points are expected to experience gutter-deep flood. 30mm/1hr Level 1 flood points are expected to experience tire-deep flood or higher; Level 2 flood points are expected to experience gutter-deep flood.

PAGASA Rainfall Warning System

Place your screenshot here Automated Text Message Everytime an ARG is triggered, a text message is automatically sent to persons of authority. UP DREAM

Place your screenshot here Pushbullet Channels Channels are notification feeds that can be subscribed to. A Pushbullet is sent to notify subscribers.

Place your screenshot here Concerned agencies and offices receive an with the list of possible flooded areas.

VALIDATION

Flood reports are acquired from: ◦News articles ◦Social media and apps (e.g. Waze) ◦Communication with barangay officials

COMPARING ACTUAL FLOOD POINTS TO EXPECTED FLOOD POINTS GIVEN BY URBAN FLOODING ALERT SYSTEM: False Positive True Negative Validated List of Possibly Flooded Areas List of Actually Flooded Areas

ACTUAL TRUEFALSE MODEL FLOODEDValidated False Positive NOT FLOODED True Negative COMPARING ACTUAL FLOOD POINTS TO EXPECTED FLOOD POINTS GIVEN BY URBAN FLOODING ALERT SYSTEM:

VALIDATION SEPTEMBER 22, 2015 RAINFALL EVENT

September 22, 2015 Rainfall Event ARGs Triggered ARGMax mm/1hr Bagbaguin74 Gen. T. de Leon45.2 Mapulang Lupa63.8 Pio Valenzuela53.2 Science Garden34 Nangka20 E. Quintos St.27.6 Ususan40.4 ACTUAL TRUEFALSE MODEL Flooded14140 Not flooded1*D TOTAL155 A0.090C0.903 B0.006D

September 22, 2015 Rainfall Event

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