FLOODING DISATER RISK REDUCTION AND MANAGEMENT

flooding

1. Flooding pREPARED by: Arthur james g. sareno

2. Types of floods Flash floods River floods coastal floods urban floods

3. Categories of floods Slow-Onset Floods Usually last for a relatively longer period, it may last for one or more weeks or even months Rapid-Onset floods Last for a relatively short period, they usually last for one or two days only. Flash floods - May occur within minutes or few hours after every rain fall

4. Flood impacts Human loss River floods Property loss affects the major roads Coastal floods Urban floods economic and social disruption increase in air and water pollution

5. Flood Forecasting Anticipating floods before they occur allows for precautions to be taken and people to be warned so that they can be prepared in advance for flooding condition. Example: - Farmers can remove animals from low-lying areas and utility services can put in place emergency provisions to re-route services if needed.

6. Flood control In many countries around the world, waterways prone to floods are often carefully managed. Defenses such as levees, bunds, reservoirs, and weirs are used to prevent waterways from overflowing their banks. In the riparian zone near rivers and streams, erosion control measures can be taken to try and slow down or reverse the natural forces that cause many water ways to meander over long periods of time. Flood controls, such as dams, can be built and maintained over time to try and reduce the occurrence and severity of floods as well.

7. Flood benefits can also bring many benefits, such as– Recharging ground water,– Making soil more fertile and increasing nutrients in some soils. Flood waters provide much needed water resources in arid and semi-arid regions where precipitation can be very unevenly distributed throughout the year. Freshwater floods particularly play an important role in maintaining ecosystems in river corridors and are a key factor in maintaining floodplain biodiversity. Flooding can spread nutrients to lakes and rivers, which can lead to increased biomass and improved fisheries for a few years.

8. Assessment !!! 1-3.. Give at least 3 benefits of floods. 4-7.. Give at least 3 examples of floods impacts 8-10.. Give at least 3 types of floods

9. wala na basa-basa na !!!