The source of the Columbia River is offically Columbia Lake in British Columbia, Canada, which lies at an elevation of 2690 ft (820 m). It empties into the Pacific Ocean where the elevation is 0 (since elevations are measured as height above sea level). The river is 1,243 miles (2,000 km) long so the gradient would be 2690/1243 = 2.164 ft/mile or 820/2000 = 0.41 m/km which comes out to 4.1x10-4 ft/ft or m/m.
Young rivers are straighter and more narrow. Old rivers have many meanders (bends in a rivers channel), and young rivers do not they are fast and have a high gradient, unlike old rivers which are slow and have a shallow gradient.
The rivers of Columbia, SC are - Saluda River Congaree River Broad River
The steeper a river's gradient, the faster and greater the erosive power is.
Missouri (and Columbia)
The Caqueta (Columbia) and Columbia (Canada - British Columbia: US - Washington & Oregon) are rivers. They begin with C and end with A.
How_many_rivers_are_there_in_colombia
Gradient= Change in field value/Distance
An old river is a river with a low gradient and low erosive energy. Old rivers are characterized by flood plains.
Columbia and the Snake Rivers
The Yukon and the Columbia
columbia
This is mathematically known as slope or "rise/run".