Basic Electronics for diploma students as per technical education Kerala Syll...
Flood project case study rk
1.
2. CREATED BY :
• ANKIT KALARIYA
• 12SOECV11087
• SEMESTER 7th CIVIL (B)
UNDER GUIDANCE OF:
• SANDIP MISHARA
• ASST PROF
R K UNIVERSITY
SCHOOL OF ENGINEERING
SEMINAR ON
FLOOD
3. • Introduction
• Causes of flood
• Effects of flood
• Type of flood
• Flood management
• Case study
• Conclusion
Contents
4. Introduction
• Flood is overflow of excess
water that submerges land
and inflow of tide onto land
• The flood is the result of
runoff from rainfall and /or
melting snow in quantities
too great to be confined in
the low water channels of
streams
• A flood is usually caused by rain, heavy thunderstorms,
and thawing of snow
Source : google image
5. • Intensity of rainfall
• Topography of the catchment
• Obstruction in river flow
• Sedimentation of rivers
• earthquake
• Contraction of river
• Bank erosion
• failure of Dam
• Failure of river embankment
Causes of flood
Natural
Man-made
Source : text book
6. • Whenever there is heavy precipitation over the
catchment in terms of intensity, duration and spread,
the river will carry high flow and thus results into flood.
• The intensity of rainfall in the catchment area is the
main cause of flood.
Causes of flood
Intensity of rainfall
7. • Larger the size of the catchment more will be the
flood.
• The catchment area with steep slope increases the
run off and also the sediment inflow due to high
velocity of flow.
Causes of flood
Topography of the catchment
8. • Whenever there is heavy landslide in the river it may
cause flood on the u/s side due to arrest of flow and
consequently rise in the water level.
Causes of flood
Obstruction in river flow
9. • If the tributaries of the river carry heavy sediment load
the river bed goes on silting up gradually every year.
• It will affect the carrying capacity of the river.
Causes of flood
Sedimentation of rivers
10. • Inadequate waterway at rail and road crossing will
affect river flow.
• While constructing road or railway bridges across a
river, the approach works are done on both bank which
reduce c/s of the river.
Causes of flood
Contraction of river
11. Effects of flood
SECONDARYPRIMARY TERTIARY
Due to direct contact of
flood water
Due to result of
primary effect
Due to combined effect
of primary & secondary
effect
Physical damage
Disruption of
essential services
Long term
effect
13. • Human Loss
• Property Loss
• Affects the Major Roads
• Disruption of Air / Train / Bus services
• Communication Breakdown
• Electricity Supply Cut off
• Economic and Social Disruption
• Increase in Air / Water Pollution
Effects of flood
14. 1 Coastal Flood
2 River Flood
3 Flash Flood
Type of flood
Source : wikipidea
15. - Low-lying coastal land are more prone to coastal floods
- Caused by Intense Storms such as tropical storms and
tropical cyclones
- Tropical cyclones are also known as hurricanes
- Strong winds during these storms generate large waves
known as storm surge
- Storm surges can bring about higher water level and
cause coastal floods
Type of flood
1 Coastal Flood
16. • Sudden increase in river’s flow (water)
• Water overflows the banks
• Leads to deposit of sediments on floodplains
• Caused by snowmelt, heavy rainfall, dam failure, etc.
Type of flood
2 River Flood
17. • Sudden floods, lasts for a short duration.
• Caused by sudden and heavy rainfall.
• Can also be caused by Coastal and River floods.
Type of flood
3 Flash Flood
18. Flood management
Aims of flood management
Protection of people & property
Reduction of flood risk
Monitoring, research, forecasting & warning
Cannot be absolutely controlled only managed
23. Flood management
Forecasting consists of 4 steps:
1. Data collection
2. Data transmission
3. Data analysis and forecast formulation
4. Dissemination
Flood Forecasting
24. Case study
Flood in uttarakhand
• From 14 to 17 June 2013, Indian state of
Uttarakhand and near by received
heavy rainfall.
• The rainfall was above benchmark
which is above 375 percent.
• A multi-day cloudburst ,centered on the
state Uttarakhand caused devastating
floods and landslides.
• Due to Continuous Rain the Chorabari
Glacier melted and this triggered the
flooding of the Mandakini river which
led to heavy floods near Gobindghat,
Kedar Dome, Rudraprayag district,
Uttarakhand.
27. Case study
Loss and Damage
• Around a million people affected
• 6000 reported dead or missing
• 4200 villages affected
• 10,000 cattle livestock lost
• 3500 houses totally or partially
damaged
• 80% of the people in the productive
age (shop owners, laborers working in
petty shops, mule owners, laborers,
palanquin bearers)
28. Case study
LANDSLIDE HAZARD ZONATION MAPPING
• Landslides cause widespread damage in the Himalayas. Landslide
Hazard Zonation is important to take quick and safe mitigation
measures and make strategic planning for the future.
• GIS based mapping to understand the causes and likelihood of a
particular hazard. The need for such landslide hazard information
may vary according to the future land use.
• Landslide hazard zonation mapping at regional level of a large area
provides a broad trend of landslide potential zones. These maps are
useful for development plans, town planning , master plan for cities ,
construction of highways etc., land use planning in the sense of
avoiding high risk zones & decision making during disaster response.
29. Although flood is the most deadliest disaster still,
but it has some benefits like:
• Recharges ground water
• Fresh water flood help in maintaining food plain
ecosystem
• Boost in food production for birds
• Facilitation of weather fish to new habitat
Conclusion
