Flooding and drought revision
Download
1 / 12

Flooding and drought Revision – - PowerPoint PPT Presentation


  • 289 Views
  • Uploaded on

Flooding and drought Revision – . see s-cool.co.uk A Level G eography. Also – BBC Bitesize , and search for drought. Causes of floods. 6 causes – g lobal warming deforestation tsunamis monsoon ice melt h igh drainage density tides urbanisation

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Flooding and drought Revision – ' - tabib


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Flooding and drought revision

Flooding and droughtRevision –

see s-cool.co.uk

A Level

Geography

Also – BBC Bitesize, and search for drought


Causes of floods
Causes of floods

6 causes –

  • global warming

  • deforestation

  • tsunamis

  • monsoon

  • ice melt

  • high drainage density

  • tides

  • urbanisation

    Deforestation in detail – infiltration, transpiration, stem flow, runoff, soil enters river.

    Flood hydrograph – what it shows, how it works


Effects of floods
Effects of floods

Primary effects

  • Physical damage – Can damage any type of structure, including bridges, cars, buildings, sewerage systems, roadways, and canals.

    Secondary effects

  • Water supplies – Contamination of water. Clean drinking water becomes scarce.

  • Diseases – Unhygienic conditions. Spread of water-borne diseases.

  • Crops and food supplies – Shortage of food crops can be caused due to loss of entire harvest.[4] However, lowlands near rivers depend upon river silt deposited by floods in order to add nutrients to the local soil.

  • Trees – Non-tolerant species can die from suffocation.[5]

  • Transport - Transport links destroyed, so hard to get emergency aid to those who need it.

    Tertiary/long-term effects

  • Economic – Economic hardship, due to: temporary decline in tourism, rebuilding costs, food shortage leading to price increase, etc.


Solutions to flooding small and large scale
Solutions to flooding – small and large scale

  • the creation of embankments (artificial levees) along the river to increase channel capacity and restrict flood waters - however since 1957, 7,500km of flood embankments have been constructed and yet many were breached in the 1998 floods;

  • constructing flood protection shelters (large buildings raised above the ground) to shelter both people and animals

  • emergency flood warning systems and plans made for organising rescue and relief services;

  • providing emergency medical stores in villages

  • building flood proof storage sheds for grain and other food supplies

  • dam construction upstream and major embankments around Dhaka have been suggested however lack of money has meant that these suggestions have not been taken further.



Case study your country
Case study: Your country

Causes

Effects

Solutions





3 case studies
3 case studies

Place, date, causes and effects

Possible – Dustbowl, Philippines, Horn of Africa


Images
Images

http://www.pupilvision.com/yeareleven/hydrograph.htm

http://geobytesgcse.blogspot.com/2006/12/flooding-in-ledc-1998-floods-in.html


ad