flash flooding

qtr 2, smt 1

flooding

downpour consistently occurs for hours or when waterways are clogged in lowlands, soil is unable to absorb the rain waters

flash floods

takes place after 6hrs of continuous rain or when what clogs up the waterways are removed

heavy rains

cause of flash flood/flooding, period of time it occurs

30

typhoon count in the philippines, typhoons per year

natural hazards

common occurrence due to the geographical location & physical environment of the country

man-made activities

change the natural flow of water causing the inundation/flood of the river & creeks

• e.g. illegal logging, modernization

ormoc tragedy

• nov 5, 1991

• city of ormoc, leyte

• city sank at least 3m after 4hrs of heavy rain

• destroyed agricultural sector, highways

• 4000 death toll

• 3200 wounded

• 2500 missing

typhoon uring

typhoon in the ormoc tragedy

ondoy flood

• sep 26, 2009

• damaged metro mnl & central luzon

• heavy rains for 12hrs with the volume of water = to a month’s rain

• destruction of homes & properties

• 450,000 affected individuals

• 140 death toll

ndrrmc / national disaster risk reduction and management council

goal

• ensure the safety of the country/people during disasters

• ensure fast recovery after each disaster

aspects of facing natural calamities and human-induced emergency

1. prevention & mitigation

2. preparedness

3. response

4. rehabilitation & recovery

negative effects of flooding / flash floods

1. loss of transportation & communication

2. destruction of homes/property/businesses

3. wreckage of waterway systems, causing illness related to dirty water

4. soil erosion, destruction of crops, & drowning of domesticated animals

5. death of people & other living things