Decision making — floods risk from incessant rain and silted river bed Statement: Incessant rain for several days has created overflow and flood risk because the river bed is full of silt and mud. Which courses of action are appropriate? I. Shift people living near the river to safe places. II. Inform people about the imminent danger via radio/television. III. Clear silt and mud from the river bed immediately after the water level recedes.

Introduction / Context:This is a disaster-response and mitigation problem. The conditions—prolonged rain, overflow, and silted river bed—require immediate life-safety actions, public communication, and post-event mitigation to reduce future risk.

Given Data / Assumptions:

• Incessant rain has created an overflow/flood threat.
• The river bed is clogged with silt and mud, aggravating flooding.
• Authorities can evacuate, warn, and later dredge/clear silt.

Concept / Approach:Adopt a phased approach: protect life first (evacuation), communicate clearly (alerts), then implement mitigation once conditions allow (desilting) to reduce recurrence.

Step-by-Step Solution:

Verification / Alternative check:Standard flood management includes evacuation orders, public alerts, and post-flood river training/desilting. All three are aligned with best practice.

Why Other Options Are Wrong:

• A/B/C/D exclude at least one sound measure.

Common Pitfalls:Forgetting that some actions (like desilting) must await safe conditions; this is why III specifies “after receding.”

Final Answer:All follow