Why Delhi roads get flooded every monsoon?

In Delhi’s case, flooding could be due to two reasons: floods in the Yamuna or local rainfall. But the annual urban flooding we see is due to local rainfall. The run-off water (water left after being absorbed by the earth) from the local rainfall is supposed to drain into the Yamuna through storm water drains.

Can heat affect the slickness of road surfaces after rainfall?

This heat, known as friction, acts like a magnetic force, causing your tires to grip the road. Rain and even moisture from fog fills up the tiny grooves on the road. The absence of these rough areas means less heat (friction) is generated and tires fail to grip the road as firmly.

What causes flood in Delhi?

The run-off water from the local rainfall is supposed to drain into the Yamuna through stormwater drains. But due to a combination of reasons, including sewage flowing in stormwater drains, the run-off water does not properly drain into the Yamuna and leads to urban flooding.

Why is there potholes after rain?

Potholes are holes in the roadway that vary in size and shape. They are caused by the expansion and contraction of ground water after the water has entered into the ground under the pavement. When water freezes, it expands. If the water freezes and thaws over and over, the pavement will weaken and continue cracking.

What happens to roads in rain?

When it rains, the water on a road causes a loss of friction. As tires move over a wet surface, the water fills in the tiny pits in the road surface, effectively smoothing out the surface. As a result, the normal heat and friction created is decreased, leading to a surface that is more slippery than when dry.

Why are roads slick after first rain?

Slow down at the first sign of rain, drizzle, or snow on the road. This is when many road surfaces are most slippery because moisture mixes with oil and dust that has not been washed away. Heavy rainfall can reduce visibility to zero. Pull over and wait for the rain to subside, or until visibility is restored.