L1 Explain how a seemingly harmless normal river flows in the middle of a rapidly developing city, and can later cause a disaster.

1. Urban Development: A city develops rapidly due to factors such as population growth, industrialization, and economic progress. This development often involves construction of buildings, roads, and other infrastructure, often near or around natural features like rivers.

2. Alteration of Natural Drainage: This development can alter the natural drainage of the river. For example, construction can lead to soil compaction, which reduces the ground's ability to absorb water. Additionally, the replacement of natural vegetation with impermeable surfaces like concrete increases runoff into the river.

3. River Flow Changes: These changes can cause the river's flow to increase significantly, especially during periods of heavy rain. The river may not be able to handle this increased flow, leading to higher water levels.

4. Lack of Adequate Planning: If the city's development did not include adequate planning for flood control, such as the construction of levees or flood channels, the risk of a flood increases.

5. Disaster Strikes: When a heavy rain event occurs, the river can overflow its banks, leading to a flood. This can cause significant damage to the surrounding city, including homes, businesses, and infrastructure. It can also lead to loss of life.

6. Climate Change: Furthermore, climate change is leading to more frequent and severe weather events, including heavy rainfall. This increases the likelihood of a disaster occurring.

In conclusion, a seemingly harmless river in a rapidly developing city can cause a disaster due to factors such as alteration of natural drainage, lack of adequate flood control measures, and climate change.