Concept of Flood

Which describes flooding?

• When an area normally not covered in water that has become submerged.

• When water flow in the area stops causing clogging in sewers.

• A hazard in an urban area that automatically accompanies heavy rains.

• When water in an area exceeds 1 meter in depth during a rainfall.

Which of the following flooding cause is due to man-made structure?

• dam failure

• tsunami

• prolonged rain

• storm surge

Which describes a flash flood?

• It is flood that developed in less than six hours.

• It is flood that develops in highly populated areas.

• It is flood that results from thunderstorms.

• It is the sudden rush of water from rivers to land.

Which will promote flooding occurrence?

• lack of waste management in urban areas

• sewers and canals cleaning operations

How does tree- planting reduce the potential of flooding?

• Trees shield the ground from water.

• Trees improve the soil’s ability to absorb water.

• Trees stop water from flowing downwards.

Which of the following has the least influence on the possibility of flooding in an area?

• wind direction

• topography

• vegetation

• duration of rain

Why is flooding more common in deltas?

• Most of the vegetation in deltas are depleted.

• It can hold more water than other areas.

• It is where urban development happens.

• It is where freshwater tributaries drain to as it enters the ocean

How can urbanization influence flooding? Show the order of events that can lead to flooding.

• increase in population

• increased waste production

• poor waste management system

• blocking of paths of water during heavy rains

Which of the following are data used in making flood hazard maps?

• average number of typhoons that visit the area

• technological capacity of the area involved

• accounts of residents about flooding events

• geomorphology of the area

When Marikina City experienced a severe flooding event during Typhoon Ketsana (Ondoy), the main reason stated by authorized bodies is the rise of its river water level. The brown water that submerged most areas in Marikina is evident. Which of the following factors that influence flooding can be inferred from the text above?

• Marikina city is a low-lying area near a river.

• River water is due to runoff from areas that lack vegetation.

• Marikina City has a large population.

• Marikina City experienced a flash flood.