Plotting time series tidal water speed

Hi, what is the parameter to use to indicate flood flows velocity as positive and ebb flows velocity as negative? I tried all available lists but neither produce the type of plot i want.

Have you looked at the velocity options described here? dominant flow in the flux tool, or the downstream projection could provide what you need.

The purpose was to compare measured water speeds( by USGS) against model simulation in time series format. I am not sure how this flux tool can be used to do that.Thanks

Does figure 6 in that link not do what you describe?

No, that did not describe what I was asking. I am interested to plot water speed( not volumetric flux) in units of L/T- that is grid scale water speed in the dominant flow direction. Figure 6 is a plot of total flow in the dominant direction. Thanks for your helpfel