the.com/streamflow

means The rate and volume of water moving through a river or channel over time, measured as flow past a given point.

from A straightforward compound of 'stream' (Old English 'strēam,' meaning a flowing body of water, related to currents and streaming more broadly) plus 'flow' (Old English 'flōwan,' to move steadily like a liquid). The hydrology term is old and literal, describing rivers and runoff. Its newer use for drip-fed, continuous payments borrows that same image — value moving in a steady current rather than arriving in one lump — a modern metaphorical transplant onto an old descriptive word.