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.
Water Flow Terms. The Terms and Definitions below are courtesy of the USGS Water Science Glossary of Terms. Discharge - the volume of water that passes a given location within a given period of time. Usually expressed in cubic feet per second or cfs. Gage Height - the height of the water surface above the gage datum (zero point).