flood management case studies

• large man made enbankment 
• channel improvement - dredging 
• dams and resevoirs- Farraka dam
• planning a ganges baarrage 
• afforestation 
• terracing hilisdes- reducing siltation 

• QUAG- plan to bring river back above ground, through sutcliffe park, creating a lake
• stores water rather than going into channels- storage capacity 85,000m3
• reduced rik of flooding for 600 homes +businesses in greenwich 
  
• created a new park for residents + diverse environment for wildlife 
• wetland environment

from cambrian mountains- lot of rain and large tributaries

• forecasting- 24hr notice by met office 
• temporary structural gates put up 
• land use management- frankwell car park + playing field adjancent allowed to flood 
• upper wharfdale- grip drins removed 

• Life 3 new forest
• re instating natural river processes for 10km 
  • reconnecting meanders 
  • replacement bed matreial 
  • raise bed level 
  • consruction of woody debris dams 

outcome

• encouraging peak water flows to be held in upper catchment- longer lag time
• slower flowing more natural river system
• ability to flood onto floodplain
• benefits for birds 
• inproved grazing material for ponies and cattle

• flood abatement- reducing how much water enters river 
• afforestation 
• grip drains removed 
• channelisation + building levee
• north of city protected by woodland- can store 2.3m cubed- reducing peak flood level in the city by 150mm
  
• floodgate 
• adjustment- well organised flood warning schemes+ emergency planning

the Yangtree river- building 1994-2008

benefits 

• water suppy 
• will save lives and livelihood in densely populated jingjiang + dongting
• hydropower- provide 10%
• navigation improvements

disadvantages

• 1.2 million people displaced 
• relocations involves moving to higher ground 
• 1200 heritage sites lost