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Semester : BE - 5th Civil-A
Subject : Hydrology & Water Resources Engineering
Code : 2150602
Presentation On : Flood Manag...
 What is Flood ?
 What is Flood Management ?
 Types of flood
 Causes Of Flood
 Flood : A flood is an
excess of water (or mud) on
land that's normally dry
and is a SITUATION
wherein the inundation is
...
 According to Duration : Slow-Onset Flooding
Rapid-Onset Flooding
Flash Flooding
 According to Location : Coastal Floodi...
1. Riverine Floods: The majority of floods recorded globally are due to rivers overflowing as a
result of long-lasting pre...
 Uncontrolled unplanned urbanization - Unauthorized colonies , Poor Water and Sewerage Management
 Deforestation + Popul...
Mitigation
Measures
Mitigation
Measures
Flood plain zoning
Flood forecasting
Flood proofing
Mathematical
modeling
Res...
 Reservoirs & Flood gates -
Reservoirs can moderate the intensity and timing of the
incoming flood.
Floodgates are used...
 Levees - A levee is a barrier built to keep a river, or
other waterway away from people or
sensitive habitats.
Importa...
 Floodwall -
When construction space is low then
a flood wall is implemented to protect
low lying area.
Does not reduce...
Mitigation Measures
• Cut-off -
To have high
velocity of water flow
along a straight path
To avoid ox bow
lake
Does not...
Mitigation Measures
• Watershed Management -
Long term effect
Examples ; Afforestation
Contour farming
Check dams
Gullyi...
Mitigation Measures
• Flood ways -
Low lying are(depressions ) along the
river course is known as floodways.
Connected t...
Mitigation Measures
• Flood plain zoning-
 Oftentimes floodplain management is not
contained in a single comprehensive
do...
Mitigation
Measures
• Flood forecasting -
 For emergency evacuation
 Flood forecasting through range
of hydrodynamic/ sn...
Mitigation
Measures
• Flood proofing -
 Combination of structural change
& emergency action.
 Water proofing materials o...
Indirect Damage
Direct
Damage
Flood Damage Analysis
• clean-up costs
• disruption to
transport services (
disbility to pro...
Non-monetary losses -
variability
-Loss of life & cattle
-- Loss of health
-Loss caused by social
distress
-Loss due to hi...
 Where applicable, the best practices described in here
should be taken into ac-count, in particular on:
 Integrated riv...
types of  flood & flood mitigation/management techniques - damages
types of  flood & flood mitigation/management techniques - damages
types of  flood & flood mitigation/management techniques - damages
types of  flood & flood mitigation/management techniques - damages
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this presentation gives a brief about what are the different types of floods depending upon area & its cause.It is further aided with mitigation or management techniques to be implemented & types of damages.

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types of flood & flood mitigation/management techniques - damages

  1. 1. Semester : BE - 5th Civil-A Subject : Hydrology & Water Resources Engineering Code : 2150602 Presentation On : Flood Management Prepared by : Eddy Ankit Gangani eddygangani@gmail.com
  2. 2.  What is Flood ?  What is Flood Management ?  Types of flood  Causes Of Flood
  3. 3.  Flood : A flood is an excess of water (or mud) on land that's normally dry and is a SITUATION wherein the inundation is caused by high flow, or overflow of water in an established watercourse, such as a river, stream, or drainage ditch; or ponding of water at or near the point where the rain fell. This is a unpredictable - duration type -natural and inevitable event.
  4. 4.  According to Duration : Slow-Onset Flooding Rapid-Onset Flooding Flash Flooding  According to Location : Coastal Flooding Storm surge Arroyos/Mud Flooding River Flooding Urban Flooding
  5. 5. 1. Riverine Floods: The majority of floods recorded globally are due to rivers overflowing as a result of long-lasting precipitation in the river basin. Melting snow and ice can also contribute to flooding. 2. Flash Floods : Flash floods generally occur due to local high-intensity precipitation in hilly or mountainous areas. The short warning time makes them difficult to predict. Discharges during flash floods are often much higher than normal flows in water courses. Flash floods are particularly dangerous on steep slopes. 3. Coastal Floods : Areas along the coast may be flooded due to tsunamis, hurricanes or/and unusually high tides. Also long-term phenomena like subsidence and sea-level rise can lead to the gradual encroachment of the sea. 4. Urban flooding : The urban area is paved with roads etc and the discharge of heavy rain can’t absorbed into the ground due to drainage constraints leads to flooding of streets, underpasses, low lying areas and storm drains 5. Stagnant and Urban Floods: Extreme rainfall in towns and cities combined with blocked drains can cause severe flooding. This often occurs in urban areas, where a large percentage of the surface is impermeable. 6. Lake and Canal Floods : High levels of precipitation or long-lasting inflows from streams can cause a substantial rise in water levels of lakes and canals that lack sufficient drainage capacity. Also, long periods of drought can cause man-made (peat) embankments to become unstable and fail – resulting in flooding.
  6. 6.  Uncontrolled unplanned urbanization - Unauthorized colonies , Poor Water and Sewerage Management  Deforestation + Population pressure  Lack of Flood Control Measures  Lack of attention to the nature of hydrological system  Slope Failures  Type of River  Intensity of Rainfall  Topography  Sedimentation of River/Reservoir  Obstructions in River flow  Contraction in River  Seismic effects
  7. 7. Mitigation Measures Mitigation Measures Flood plain zoning Flood forecasting Flood proofing Mathematical modeling Response planning Modifying loss burden Reservoirs-Flood gates Levees Flood wall Floodways Flood bypass Watershed Cut-off Rain Water Harvesting Channel improvement Drainage improvement Watershed management
  8. 8.  Reservoirs & Flood gates - Reservoirs can moderate the intensity and timing of the incoming flood. Floodgates are used to control the flow of water and can be a part of flood prevention. Floodgates are often incorporated into reservoir, river, stream, levee, or storm surge systems. Water flow can be either partially restricted or completely stopped, depending on the water level and desired effect. Expensive & potential error .
  9. 9.  Levees - A levee is a barrier built to keep a river, or other waterway away from people or sensitive habitats. Important considerations  First, it is important not to remove too much floodplain storage. Excess removal could restrict flood waters and slow drainage upstream. Second, levees are designed to protect an area from a certain flood level and storm intensity. If these levels are exceeded, a levee may be overtopped or may fail completely. Third, in order for a levee to continue functioning properly and provide security for those behind it, a levee should be regularly inspected and maintained.
  10. 10.  Floodwall - When construction space is low then a flood wall is implemented to protect low lying area. Does not reduce the flood flow but reduce spilling Acts as a retaining wall Section : Rectangular trapezoidal Sheet piling
  11. 11. Mitigation Measures • Cut-off - To have high velocity of water flow along a straight path To avoid ox bow lake Does not reduce the flood flow but reduce spilling
  12. 12. Mitigation Measures • Watershed Management - Long term effect Examples ; Afforestation Contour farming Check dams Gullying Bank protection Diversion drains
  13. 13. Mitigation Measures • Flood ways - Low lying are(depressions ) along the river course is known as floodways. Connected to natural channel or artificial channel Temporary storage Can be used for agriculture other than flood. Do not reduce the flood flow but reduce spilling
  14. 14. Mitigation Measures • Flood plain zoning-  Oftentimes floodplain management is not contained in a single comprehensive document, but instead is incorporated into other rules, guidelines, or regulations, including: • Floodplain Management Ordinance • Encourage appropriate development • Community Master Planning • Flood Hazard Zoning • Open Space Preservation Ordinance • Education and Outreach • Emergency Management Program • Mapping Program or GIS
  15. 15. Mitigation Measures • Flood forecasting -  For emergency evacuation  Flood forecasting through range of hydrodynamic/ snowmelt / flood routing models.  Flood warnings  CWC National Flood Forecasting Network
  16. 16. Mitigation Measures • Flood proofing -  Combination of structural change & emergency action.  Water proofing materials on windows  Water tight closure on doors  Example : use of flood wall or levees on periphery of building
  17. 17. Indirect Damage Direct Damage Flood Damage Analysis • clean-up costs • disruption to transport services ( disbility to provide community services) • disruption to utilities • disruption to public & emergency services • economic impacts of health issues • damage to building • external damage (pools, gardens, fences, shed contents) • motor vehicles • infrastructure (roads, bridges and other services) • clean-up costs for individual home owners • loss of stock • cost of re-instatement or rebuilding of houses and buildings. Tangible Damage
  18. 18. Non-monetary losses - variability -Loss of life & cattle -- Loss of health -Loss caused by social distress -Loss due to hindrance in development work -Physical ailments Flood Damage Analysis Intangible Damage
  19. 19.  Where applicable, the best practices described in here should be taken into ac-count, in particular on:  Integrated river basin approach  Public awareness, public participation and insurance  Research, education and exchange of knowledge  Retention of water and non-structural measures  Land use, zoning and risk assessment  Structural measures and their impact  Flood emergency  Prevention of pollution
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this presentation gives a brief about what are the different types of floods depending upon area & its cause.It is further aided with mitigation or management techniques to be implemented & types of damages.

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