Human activities that degrade the environment often increases flooding. These activities include: Deforestation. The lack of vegetation encourages water to flow over the surface rather than infiltrate into the soil thus increasing surface runoff.

After centuries of civil war, feudal Japan began a long period of peace and prosperity during the Tokugawa shogunate. Increased population growth and urbanization led to increasing demands for timber.

When areas were deforested during the early Renaissance, what was the response? Move on to another forested area.

The Flood Magnitude value is a measure of “how severe” a flood is, as a strictly hydrological occurrence (no assessment of damage is implied). “0” is the smallest reported value (discharge is below the 1.5 y recurrence interval discharge; no flooding). A longer duration flood exhibits a higher flood magnitude.

The World’s Most Catastrophic Floods, in Photos

1. The Johnstown Flood was so massive it equaled the flow of the Mississippi River.
2. The Central China Flood may have killed as many as 3.7 million people.
3. One flood was known as the “Great Drowning of Men.”
4. Few floods in recorded history compare to the one that rocked the Indus River Valley in 1841.

Top 10 deadliest floods in the world history

• 10- North Sea flood, The Netherlands (1212)
• 9- St.
• 8- Jiangsu-Anhui flood / Yangtze river flood, China (1911)
• 7- Red River Delta flood, North Vietnam (1971)
• 6- St.
• 5- Yangtze river flood, China (1935)
• 3- Yellow River flood, China (1938)
• 2- Yellow River flood, China (1887)

Overbank flooding occurs when water rises overflows over the edges of a river or stream. This is the most common and can occur in any size channel — from small streams to huge rivers.

River flooding

For the most part there are five different types of floods: flash floods, coastal floods, urban floods, river floods, and ponding floods.

Rainfall is the most important factor in creating a flood Put simply, floods occur when the amount of water flowing from a catchment exceeds the capacity of its drains, creeks and rivers.

[10] Flood damage is influenced by many more factors among which are flow velocity, flood duration, contamination, sediment concentration, lead time and information content of flood warning, and the quality of external response in a flood situation [Smith, 1994; Penning-Rowsell et al., 1994; USACE, 1996; Nicholas et al …

The causes of flooding are usually a result of both physical and human factors. Physical factors are those which are caused by nature. Human factors are when human intervention and interference create the conditions for flooding.

Common causes of man-made floods

• Infrastructure failures.
• Development and infrastructure in flood-prone areas.
• Deforestation.
• Impermeable surfaces.
• Bridge constriction.
• Flood embankments.
• Climate change.

Natural just as a rain River flooding indeed is a natural phenomenon. The river swells with water and eventually, there is so much water that it must spill across the river banks. See this picture: This is Kopački rit, the huge floodplain of the Danube River.

The RELIEF of the land can also have an impact. Steep slopes tend to reduce the amount of infiltration of water into the ground, this water can then flow quickly down to rivers as overland flow. In addition, steep slopes also cause more through flow within the soil. Both can raise river levels.

Soft engineering is enhancing a river’s natural features, its banks, to protect them from erosion. Examples of soft engineering strategies include planting vegetation and river restoration. Dredging involves excavating the sediment at the bottom of the river bed and moving it to a different location.

The river channel may be widened or deepened allowing it to carry more water. A river channel may be straightened so that water can travel faster along the course. The channel course of the river can also be altered, diverting floodwaters away from settlements.