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Hydrological Hazards Flood Hazards 8-9 - Coggle Diagram
Hydrological Hazards Flood Hazards 8-9
flood risk management
lecture 8
Integrated flood risk management
- sustainable development = balancing development needs and flood risks
maximising net benefits from floodplains = ensure livelihood security and poverty alleviation thereby addressing vulnerability
minimising loss of life= in particular through end-to-end flood forecasting & warning (ff&W) Systems and preparedness planning for extreme events
Environmental preservation = ecosystem heath & Services
Addresses the
whole water cycle
using a
multi - hazard approach
at the
river basin scale
with
stakeholder participation
the flooding chain
-----> 3 components =
sources
what actually causes your flooding
pathway
what happens once the flood is underway
receptors
what is the impact, people, property and environment
Traditional river management = straighten the channel, deepen the channel , minimise surface roughness and stop banks--- all these management types are artificial however the most effective may is naturally
catchment based natural flood management
three primary approaches
Increasing roughness - physically impeding flow in the channel, diverting onto floodplain
Attenuating flows - in soils, channel and flood plain
Infiltrating flows - tree planting, soakaways and spreads
by increasing
roughness
of the landscape you imped flows inn the channel you do this because it slows it down - if you can slow it down you can flatten out the flood Peak
to
Alternative
(to reduce flow) so the overall reduce flow coming through system
Increasing infiltration
tree planting ect
case study = Frome river, stroud, UK huge peak resultinng in massive flood event
Insurance
lecture 9
risk is all about insurance
= Demand is an individuals risk profile how often is something bad going to happen
Principals of insurance = supply - pooling risks 1. different people different risk
some people have never claimed insurance and some people are lucky they have it
Insurable risks
- diversifiable = wont all happen at once --- Quantifiable = can assess exposure, likelihood and spread
Fortuitous= may happen, or may not
Economic = policyholder ca afford to pay
Impact of climate change
has a massive impact on insurance and its going to continue to be a massive issue
running an insurer: hazards
- average years insurance companys are profitable which is most years but years that are not profitable are years that have disasters - earthquakes cause the most damage, frequent storm or flood events
pricing
- expected claims change and not all pricing is based on just "just year" and the impact on climate change and demand surge can get higher
there is a clear relationship in terms of climate and disasters
in the past three years New Zealand has been la nina years high flood risk, around the world seeing a switching from cold to warm