It looks like this is a pond refresh, i.e. after the pond if full, 12 hours later it starts to empty it perhaps a detailed explanation of the whole process will help, for example what fills the pond, is it continuous etc.
is there a level to say it is full ?, just seems a little odd.
Also why start a timer again after 2 hours, if the probe is wet it will not close the valve & go to the end there seems to be no need for the 3 timers you show just run a time for 12 hours, open the valve, when the probe has been dry for 2 hours close the valve ?
Well that's what it looks like to me.
for example:
Start.
Is probe wet yes start 12 hour timer
is timer up YES then open valve
wait until probe goes dry, start 2 hour timer
2 hour timer up close valve.
END