Account for hillslope aspect in ET calculations?


I know you guys use Penman Montieth for ET – one of the things it is highly sensitive to is solar radiation – I know you have a setting that is how many hours per day the system sees sunlight, but have you considered integrating the hill aspect into the app/calculations? e.g. we have a steep south facing slope, so the ET will be a lot higher than an equivalent steep north facing slope.

It seems you could probably do some basic map work and have the user drop a pin on each zone and use existing DEMs to try to auto-calculate the slope/aspect.