For the one that is pulsed is there a second relay to close the valve?

Can you provide a bit more detail how this waterfall relay is working? That will help with trying to come up with a solution for this.

I would use max 5 presets for the waterfall (0%, 25%, 50%, 75%, 100% water flow) From there you will have 5 buttons on your interface (Off, 25%, 50%, 75%, 100%) Using an interlock for your button press the output of the interlock will go into a truth table. You will need to have a second set of inputs and these come from the current position of your valve which will also come from an interlock.

Within the Truth table you will need to compare each possible option and on the output you will need to connect them to a one shot for each possibility. You will also need 5 Or's, one for each preset. Your output of the Or goes into the input of your second interlock (the one being used for current valve position).