Once a person is affected by a dengue virus, the platelets can no longer âactivateâ itself. So whenever there is damage, the platelets cannot form the mesh structure and the blood flows out of the vessel. As blood flows out, so does the platelets. This causes the platelet count to fall drastically. The blood that flows out causes internal. and external bleeding and leads to a haemorrhage.
1 Today, the Aswan Dam keeps the Nile from flooding modern cities. 2  The Ancient Egyptians called the Nile the Aur, which means black and comes from the black soil. 3  The Egyptians measured the height of the annual flood using a Nilometer.
Amazon River flood of 1953. The Amazon River basin, by far the largest river basin in the world, is responsible for 20 percent of the world's discharge of freshwater into the oceans. Seasonal floods cover an area as large as 140,000 square miles every year.he Amazon River basin, by far the largest river basin in the world, is responsible for 20 percent of the world's discharge of freshwater into the oceans. Seasonal floods cover an area as large as 140,000 square miles every year.