Non-structural measures of flood disaster management in India include __________. A. Flood zonation B. Flood forecasting C. Embankment construction D. Channel improvement Choose the most appropriate answer from the options given below:
A and B only
Understanding Flood Disaster Management Measures
Flood disaster management involves a range of strategies aimed at reducing the impact of floods. These strategies can be broadly categorized into two types: structural measures and non-structural measures.
Structural Measures: These involve physical constructions or modifications to control or divert floodwaters. They are designed to alter the natural behavior of rivers and floodplains.
Non-structural Measures: These do not involve physical construction but focus on minimizing flood damage through planning, legislation, education, and emergency preparedness. They work by changing human behavior and vulnerability to flooding.
Analyzing Flood Management Options
Let's examine each option provided in the question to determine if it is a structural or non-structural measure of flood disaster management in India.
- A. Flood zonation: This involves delineating areas based on their susceptibility to flooding (e.g., flood-prone zones). It is a planning tool used to regulate land use in these zones, discourage construction in high-risk areas, and guide development away from floodplains. Since it's a planning and regulatory measure, it is considered non-structural.
- B. Flood forecasting: This involves predicting the occurrence, magnitude, and timing of floods based on meteorological and hydrological data. Providing timely warnings allows people to evacuate and take necessary precautions. This is an information-based measure aimed at preparedness and response, making it non-structural.
- C. Embankment construction: Embankments (also known as levees or bunds) are physical barriers built along river banks to prevent floodwaters from overflowing into adjacent areas. This involves significant civil engineering work and physical alteration of the landscape, classifying it as a structural measure.
- D. Channel improvement: This involves modifying river channels, such as deepening, widening, or straightening them, to increase their capacity to carry water and speed up flow. These are physical alterations to the river course, making them structural measures.
Identifying Non-structural Measures
Based on our analysis:
- Flood zonation (A) is non-structural.
- Flood forecasting (B) is non-structural.
- Embankment construction (C) is structural.
- Channel improvement (D) is structural.
The question asks for non-structural measures. Therefore, options A and B are the correct non-structural measures among the choices provided.
Comparing Options
Now let's look at the given options and see which one includes only the non-structural measures (A and B):
- Option 1: A and D only (D is structural - Incorrect)
- Option 2: A and B only (Both A and B are non-structural - Correct)
- Option 3: B and C only (C is structural - Incorrect)
- Option 4: B and D only (D is structural - Incorrect)
The combination that includes only non-structural measures is A and B.
| Measure | Type | Description |
|---|---|---|
| Flood Zonation | Non-structural | Regulating land use in flood-prone areas |
| Flood Forecasting | Non-structural | Predicting floods and issuing warnings |
| Embankment Construction | Structural | Building physical barriers along rivers |
| Channel Improvement | Structural | Modifying river channels physically |
Revision Table: Flood Management in India
| Category | Examples |
|---|---|
| Structural Measures | Dams, Reservoirs, Embankments, Channel Improvements, Diversion Canals |
| Non-structural Measures | Flood Zonation, Flood Forecasting, Early Warning Systems, Land Use Planning, Flood Preparedness Plans, Flood Insurance, Public Awareness Campaigns |
Additional Information on Non-structural Flood Management
Non-structural measures are increasingly emphasized in modern flood disaster management due to their sustainability and adaptability. They often work in conjunction with structural measures to provide a comprehensive flood management strategy. Some key aspects include:
- Early Warning Systems: These integrate flood forecasting with communication networks to alert communities in advance, enabling timely evacuation and reducing loss of life and property.
- Land Use Planning and Regulation: Restricting or regulating construction in floodplains helps reduce the population and assets exposed to flood risk. This is a core component of flood zonation.
- Flood Preparedness: This involves developing community and household-level plans for what to do before, during, and after a flood. It includes stockpiling supplies, identifying evacuation routes, and securing property.
- Flood Insurance: While not preventing floods, insurance helps in financial recovery after a flood event, reducing the economic impact on affected individuals and businesses.
- Public Awareness and Education: Educating communities about flood risks, safety measures, and the importance of preparedness helps build resilience.
These measures are crucial for building resilience and reducing vulnerability to flood disasters, especially in a country like India which experiences frequent and widespread flooding.
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2. Air in the centre of the system must be subsiding.
3. Anticyclones are characterized by converging winds.
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