How does drainage affect flooding?
Oftentimes, garbage that is not properly disposed enters into drainage systems and clogs drains. This obstructs the free flow of the water that enters into these drains causing water to back up during rainfall flooding the surrounding area.
What are some reasons for flooding?
Why do floods occur?
- volume, spatial distribution, intensity and duration of rainfall over a catchment.
- the capacity of the watercourse or stream network to carry runoff.
- catchment and weather conditions before rainfall.
- ground cover.
- topography.
- tidal influences.
When was the last flood in Chennai?
2015 South India floods
| Submerged bridges in Chennai | |
|---|---|
| Date | 8 November 2015 – 14 December 2015 |
| Location | South India (Tamil Nadu, Puducherry, Andhra Pradesh) |
| Deaths | 500+ Tamil Nadu: 422 (official, likely more) Andhra Pradesh: 81 Puducherry: 3 |
How does heavy rainfall affect drainage basin?
If there’s a sudden “burst” of heavy rain, the rainwater won’t be able to infiltrate fast enough and the water will instead enter the river via surface runoff. This leads to a sudden and large increase in the river’s discharge which can result in a flash flood.
How does drainage density cause flooding?
Large basins receive more precipitation than smaller basins, therefore they have a larger runoff. Basins with a higher drainage density (number of tributary rivers) collect rain water more quickly, therefore the lag time will be shorter.
What are the three rivers that flow through Chennai?
Three main rivers flow through Chennai namely Kuvam, Adyar and Kosastha Talayar. These three rivers play a major role in moving the flood water into Bay of Bengal. These river banks were occupied by occupants which eventually has narrowed the river flow.
Why is Chennai trembling like a leaf?
Chennai is trembling like a leaf due to palpitate rains. It has rained 112cms from last one month which is a record until now. The entire city is darkened with clouds and thunders are lightening every corner of the city. Many residents were starving for food.
Why did the flood water get stragmented in Gujarat?
This is one of the main reason for the flood water to get stragmented. There was no proper care taken on the Buckingham canal which is also a major path leading the flood water into the sea. READ MORE Nitin Patel out of Gujarat CM race,Vijay Rupani holds it.
Why did the flood water get stragmented in the river?
These river banks were occupied by occupants which eventually has narrowed the river flow. This is one of the main reason for the flood water to get stragmented. There was no proper care taken on the Buckingham canal which is also a major path leading the flood water into the sea.