If you have the space, it’s possible to make water flow up hill. Crazy but true….
ws = water source, si = sign, hb = half-block (slab), __ = blank spot, ** = full block
.. .. .. si ws __
.. si ws __ hb **
ws __ hb **
That setup will have water go up 3 blocks; some work but kind of cool (playing with it as a boat return for a feature we’ve tossed around)
(I’ll take a picture of this later; credit is not mine, saw someone else with this setup on custom and found it could go uphill.)