Question

What is the reason for floods in a river?

Answer 1

As land is converted from fields or woodlands to roads and parking lots, it loses its ability to absorb rainfall. Urbanization increases runoff 2 to 6 times over what would occur on natural terrain. During periods of urban flooding, streets can become swift moving rivers, while basements and viaducts can become death traps as they fill with water.

Several factors contribute to flooding. Two key elements are rainfall intensity and duration. Intensity is the rate of rainfall, and duration is how long the rain lasts. Topography, soil conditions, and ground cover also play important roles. Most flash flooding is caused by slow-moving thunderstorms, thunderstorms repeatedly moving over the same area, or heavy rains from hurricanes and tropical storms. Floods, on the other hand, can be slow- or fast-rising, but generally develop over a period of hours or days.

Answer 2

Floodplains is the area of alluvial deposits found beside the river due to flooding and meandering .The flood brings a fine sands and silts along with it, gets deposited around the rivers in plain.Similary meanders erode away the valley slowly and create a wide valley floor, depositing alluvial, fine silt along the slopes.Over time this builds up into a large flood plain.  

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