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Advantages of dams and reservoirs
Multi-purpose can be used for energy production (HEP) and water storage as well as flood control
Provides opportunities for recreation: Water sports, fishing
Reservoirs can attract tourists.
Disadvantages of dams and reservoirs
Expensive
Loss of farmland and homes due to reservoir creation
Displacement of people
Affects on ecosystems: can affect fish breeding
Dams trap sediment which means the reservoir can hold less water.
Habitats are flooded often leading to rotting vegetation.
releases methane which is a greenhouse gas.
Advantages of channel straightening
Speeds up the movement of water over a short distance
More water can be held in the channel.
it can be used to reduce flood risk in built-up areas.
Disadvantages of channel straightning
May increase flood risk downstream as the discharge reaches those areas more quickly
Expensive
Dredging needs to be done frequently.
Affects river ecosystems due to changes in velocity
Advantages of embankments / levees
Increased river capacity means it is less likely to flood
New river bank habitats may be created
Disadvantage of embankments / levees
Visually unattractive particularly if made from concrete
May fail and lead to more serious flooding
Advantages of flood relief channels
Effective in reducing the flood risk in high value areas
New habitats may be created
Insurance costs may be reduced for people living nearby
Disadvantages of flood relief channel
Expensive
Regular maintenance is needed
Disruption to existing habitats
Can be visually unattractive
If water levels continue to rise, the relief channel may also flood.
Advantages of flood warning and preperation
Disadvantage of flood warnings and preperation
Advantage of flood plain zoning
Disadvantages of flood plain zoning
Advantages of planting trees
Disadvantages of planting trees
Advantages of river restoration
Disadvantages of river restoration
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