Flood project case study rk

flood project
case study
rku projrct
seminar

1. Flood

2. CREATED BY : ANKIT KALARIYA 12SOECV11087 SEMESTER 7 th 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 SECONDARY PRIMARY 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

12. Effects of flood Primary effect Secondary effect Tertiary effect Source : wikipidea

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

19. Flood management Hard engineering (Structural) Soft engineering (Non-structural) Embankments Dams & reservoirs Channel improvement Drainage improvement Diversion of flood rivers Flood plain zoning Flood preparedness Flood forecasting Afforestation Public relief

20. Flood management Embankments Dams & reservoirs Source : book

21. Flood management Drainage improvement Diversion of flood river Source : book

22. Flood management Flood plain Zoning Source : book

23. Flood management Forecasting consists of 4 steps : Data collection Data transmission Data analysis and forecast formulation 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 .

25. Case study Flood in uttarakhand

26. Case study Flood in 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