Last name meaning Ferris: This is an Anglicization of the Old Gaelic name O' Fearghusa - a compound of the Gaelic O (meaning grandson or male descendant) and the personal name Fergus, composed of the elements fear - a man and gus - vigour or force...
At other times, a confluence can be the location where two smaller streams or rivers merge to become the source for a new river. This is the case in Pittsburgh, Pennsylvania, where the Monongahela River and Allegheny River merge to create the Ohio River.
1 Tributaries-downstream of a confluence, the gradient may increase because discharge (and therefore the rate of downward erosion on the river's bed) is higher than upstream of the confluence. 2  Pools and riffles-on a small scale, particularly in the upper course, the long profile is stepped.ischarge is the volume of flow of water per unit time, often measured in cubic metres per second (or cumecs). In general, discharge increases with distance from the source to the mouth of a river. The extra water enters the river from tributary streams, surface runoff, throughflow and baseflow.