61792
Beschreibung
Mindmap von maddiemurchie23, aktualisiert more than 1 year ago
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Erstellt von maddiemurchie23
vor mehr als 11 Jahre
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River Management
- Hard engineering
- Dams and reservoirs
- Huge walls built across
rivers to store water
- Aims to store water and
control the discharge
- Water is released at a steady flow
throughout the year to prevent flooding
from high levels of discharge
- Water is released at a steady flow
throughout the year to prevent flooding
from high levels of discharge
- Huge walls built across
rivers to store water
- Levees
- Increasing height of riverbanks
and creating parallel riverbanks
- Increasing height of riverbanks
and creating parallel riverbanks
- Diversion channels
- When the water level is too high the
water is diverted elsewhere, often have
gates
- When the water level is too high the
water is diverted elsewhere, often have
gates
- Channel straightening
- Removal of meanders etc.
- Velocity of the river increases
due to efficiency increases
- The water is moved out of
the area as quickly as
possible
- The water is moved out of
the area as quickly as
possible
- Removal of meanders etc.
- Dams and reservoirs
- Soft engineering
- Land use management
(floodplain zoning)
- Limiting land use to
allow natural flooding
- Land used as a
sponge to absorb
discharge
- Limiting land use to
allow natural flooding
- Wetland and river
bank conservation
- Protecting existing river
channels and valleys
- Conserving wetlands and
riverbanks provides natural
protection
- More interception = less discharge
- More interception = less discharge
- Protecting existing river
channels and valleys
- Forecasts and warnings
- Monitoring of weather to predict rainfall
to give time to prepare for flooding
- Monitoring of weather to predict rainfall
to give time to prepare for flooding
- River restoration
- Returning rivers back to their
original state
- Removal of any management methods to
allow it to flood naturally upstream to prevent
flooding downstream in towns
- Returning rivers back to their
original state
- Soft engineering: case study
- River Quaggy -
Tributary of the River
Thames
- Flowing north
- Source at
Locksbottom
- Large number of
green space (unusual)
- Flowing north
- How was it managed?
- Artificial channels and
culverts underground
- Widening and deepening was
considered - QWAG didn't choose it
because it aims to improve the local
environment
- Artificial channels and
culverts underground
- What methods were used?
- River was bought back to the
surface by cutting a new
channel
- A new lake was created
to take water when full
- Holds 85,000 square metres
- Holds 85,000 square metres
- The park was lowered and shaped into a flood plain
- River was bought back to the
surface by cutting a new
channel
- Effects
- Reduced risk of flooding to
600 homes and businesses
- Created a diverse
environment for
wildlife
- Land can't be built on
- Cost of maintenance
- Conflict - land is needed
for affordable new
buildings
- Doesn't stop flooding overall
- Reduced risk of flooding to
600 homes and businesses
- River Quaggy -
Tributary of the River
Thames
- Land use management
(floodplain zoning)
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