Why is the Nile not flooding now?

The Nile River is characterized by regular flooding, usually starting in May in northern Sudan, reaching its highest level in August, and gradually declining thereafter, with low levels from January to May. Although flooding occurs regularly, the amount of water and the timing of high tides vary greatly. The reason for this phenomenon is the Blue Nile and Atbara rivers, which are fed by seasonal rainstorms in the Ethiopian highlands.

More than 80% of the Nile's water is supplied by the Ethiopian highlands, with the rest coming from the East African highland lakes. When the flood comes, it will inundate the farmland on both banks, and when the flood water recedes, it will leave a thick layer of river mud to form fertile soil. Four or five thousand years ago, the Egyptians knew how to grasp the laws of the flood and use the fertile land on both sides.

For a long time, the Nile valley has been a place of cotton fields and fragrant rice flowers. Sandwiched between the Sahara Desert and the Arabian Desert, the meandering Nile River is like a green walk, full of infinite life.

Now the Nile has the Aswan Dam, and there are fewer floods. The Aswan Dam, which is 111 metres high, 3,830 metres long and 40 metres wide, cuts off the Nile and backs the river 500 kilometres upwards to form Lake Nasser, an artificial lake with a capacity of 164 billion cubic metres. It calms floods and stores enough surplus water for several years.

Many dams have been built to hold back the water; The development of industry and agriculture consumes a lot of water.

The construction of the Aswan Dam slows down the flow of water, reduces the amount of water used artificially, and reduces the amount of ice melt from the water source due to global warming, which is also a reason for the decrease in water volume.

The Nile has two tributaries – the Blue Nile and the White Nile. The Blue Nile River floods regularly, causing the main stream to overflow. Now, the Aswan Dam has been built, so it doesn't flood.

Environmental damage, reduction of water volume.

The problem is strange enough, the climate is getting better.

The construction of the Aswan Dam slowed down the flow of water, which indirectly led to the reduction of water volume due to increased artificial use.

It can be seen that the Yangtze River will be cut off soon.

About the depth of the Nile:

The average water depth is about 50 centimeters, generally around 20 30 centimeters, and you can touch it as soon as you stretch your arm. ”

Expansion: The longest river - the Nile River, which means "great river" in Arabic, has a total length of 6,671 kilometers, making it the largest river in Africa and the longest river in the world.

The Nile, the world's longest river, is the father of Africa's main river, located in northeast Africa, and is an international river. The Nile originates in the Burundi Highlands on the East African plateau south of the equator, and its main stream flows through Burundi, Rwanda, Tanzania, Uganda, South Sudan, Sudan and Egypt before emptying into the Mediterranean. The basin covers an area of nearly 3 million square kilometers, 1 10 of the ancient African continent, and the average annual runoff at the mouth of the sea is 81 billion cubic meters.

It spans latitudes ranging from 4° south latitude to 31° north latitude, up to 35°.

The Nile floods in August to November.

The average annual flow of the White Nile at the confluence of the Blue Nile is 890 cubic meters per second, which is about half that of the Blue Nile. The lower reaches of the Nile are mainly supplied by the Sobat, Blue Nile and Atbara rivers, which originate in the Ethiopian highlands, with the Blue Nile being the most important.

The upper reaches of the Nile originate in the East African Plateau and meet the Sobat, Blue Nile and Atbara rivers successively, and there are no tributaries below.

The confluence of the White and Blue Nile rivers is surrounded by the Kizira Plain, and the section of the river below the confluence point is called the Nile. The Nile flows north of Khartoum through sedimentary rocks, and the valley from there to Aswan is narrow. Below Aswan, the river valley widens to about 16 kilometers to the Naja Hammadi area, the river is close to the east bank, and the river valley plain is mostly in the west of the river.

The White Nile River originates in the equatorial rainy region and has an abundant and stable amount of water. However, after flowing out of the plateau and into the basin, due to the extremely flat terrain, the water flow is unusually slow, and the plants that flourish in the water also delay the progress of the water flow, and the sunlight in the low-latitude dry area evaporates strongly, thus losing a huge amount of water, and very little water can flow downstream.

It turned out to be caused by the inflow of tributary water, which caused the low-lying White Nile section of the river to backflow, and the Blue Nile River flowed through the steep terrain. The Sobat River, a tributary of the White Nile, begins to rise in May, with the highest water level occurring in November, when the Sobat River is higher than the White Nile, pushing it back up.

The Blue Nile River originates in the Ethiopian highlands, and its upper reaches are in tropical mountainous areas with abundant water. Water is limited in the spring, but it starts to rise in June and continues rapidly**, reaching its peak in early September. During this period, it also causes the White Nile to form an inflow.

The water level falls from November to December, and then the dry season begins. Due to the strong and distinct seasonality of precipitation, the river flow varies greatly from year to year, with the maximum flow reaching 5,610 cubic meters during the flood season and the minimum flow of only 85 cubic meters in the dry season, which is about 1 60 of the maximum flow during the flood season

The Atbara River, which also originates in the Ethiopian highlands, has a more variable flow due to its northerly location, more concentrated rainfall, and a smaller basin. In winter, the river breaks and the riverbed becomes a series of small lakes.

Floodwaters from the main stream of the Nile reached Khartoum in June, reaching their highest levels in September and peaking in Cairo in October.