I haven't found one, but I usually water it as much aspossible to make the soil 100% and then let it adjust from there.

I tried setting up the manual watering system and found it still watered when it rained.  It would be a great feature if it would stop watering even when manually programmed to stop watering when rain is in the forecast. 

I'm having the same problem.  It says it's rained, which it may have a few miles away,  but i didn't receive a drop.  Is there a way to edit my graph to show I didn't receive any rain? 

Two ways that I know of to determine soil type.  First one is making a visual observation and trying to determine what you have by the way the soil acts, feels and forms.  Second option would be to take a simple soil test.  I've done this with my local university (Michigan state). Only costs $25 and they'll give you your soil type as well as soil nutrients.  I prefer the soil test because I'm a horrible at determining soil type.