Stormwater is also a resource and important as the world's human population demand exceeds the availability of readily available water. Techniques of storm water harvesting with point source water management and purification can potentially make urban environments self-sustaining in terms of water.
Rivers flow downhill to sea level (generally speaking; some end in other bodies of water or join another rver). They flow with gravity from a higher elevation to a lower. The Nile rises on the western flank of the Great Rift Valley (many people consider Lake Victoria to be the source) and the Blue Nile joins the White Nile at Khartoum. The land falls away towards the north, thus the river flows north until it reaches the Mediterranean Sea at the Nile Delta. Direction of flow of a river is determined by elevation of the drainage basin, not geographical (North, South etc.) direction. http://en.wikipedia.org/wiki/Nile#Course.
About the Nile River. The Nile River is the longest river in the world. It is over 4,100 miles long! The Nile is located in northwest Africa and flows through many different African countries including Egypt, Sudan, Ethiopia, Uganda, and Burundi.There are two major tributaries that feed the Nile, the White Nile and the Blue Nile.he Nile River flows north through Egypt and into the Mediterranean Sea. Ancient Egypt was divided into two regions, Upper Egypt and Lower Egypt. This looks a bit confusing on a map because Upper Egypt is to the south and Lower Egypt is to the north. This is because the names come from the flow of the Nile River.